Skip to main content
Advertisement
Browse Subject Areas
?

Click through the PLOS taxonomy to find articles in your field.

For more information about PLOS Subject Areas, click here.

  • Loading metrics

The burden of unlawful use of opioid and associated epidemiological characteristics in Africa: A scoping review

  • Hope Onohuean ,

    Roles Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Resources, Software, Validation, Visualization, Writing – original draft, Writing – review & editing

    onohuean@gmail.com

    Affiliations Biopharmaceutics Unit, Department of Pharmacology and Toxicology, Kampala International University Western Campus, Ishaka-Bushenyi, Uganda, Discipline of Pharmaceutical Sciences, School of Health Sciences, Westville Campus, University of KwaZulu-Natal, Durban, South Africa

  • Frasia Oosthuizen

    Roles Conceptualization, Data curation, Funding acquisition, Investigation, Methodology, Project administration, Supervision, Writing – review & editing

    Affiliation Discipline of Pharmaceutical Sciences, School of Health Sciences, Westville Campus, University of KwaZulu-Natal, Durban, South Africa

Abstract

Introduction

There is an ongoing global upsurge of opioid misuse, fatal overdose and other related disorders, significantly affecting the African continent, due to resource-limited settings and poor epidemiological surveillance systems. This scoping review maps scientific evidence on epidemiological data on unlawful opioid use to identify knowledge gaps and policy shortcomings.

Method

The databases (PubMed, Scopus, Web of Sciences) and references were searched guided by Population, Concept, and Context (PCC) and PRISMA-ScR. The extracted characteristics examined were author/year, African country, epidemiological distribution, age group (year), gender, study design and setting, common opioid/s abused, sources of drugs, reasons for misuse, summary outcomes and future engagement.

Results

A population of 55132 participated in the included studies of 68 articles, with the largest sample size of 17260 (31.31%) in a study done in South Africa, 11281(20.46%) in a study from Egypt and 4068 (7.38%) in a study from Ethiopia. The gender of the participants was indicated in 65(95.59%) papers. The mean and median age reported in 57(83.82%) papers were 15.9-38, and 22-31years. The majority of study-designs were cross-sectional, 44(64.71%), and the most used opioids were heroin, 14articles (20.59%), tramadol, 8articles (11.76%), and tramadol & heroin, 6 articles (8.82%) articles. Study-settings included urban community 15(22.06%), hospital 15(22.06%), university students 11(16.18%), and secondary school learners 6(8.82%). The highest epidemiological distributions were recorded in the South African study, 19615(35.60%), Egyptian study, 14627(26.54%), and Nigerian study 5895(10.70%). Nine (13.24%) papers reported major opioid sources as black market, friends, and drug dealers. To relieve stress, physical pain and premature ejaculation, improve mood and sleep-related problems and help to continue work, were the major reasons for taking these drugs as reported in twenty articles (29.41%).

Conclusion

The findings of this scoping review show significant knowledge gaps on opioid usage in the African continent. The epidemiological distribution of unlawful use of opioids among young adults, drivers, and manual labourers in both genders is evident in the findings. The reason for use necessity scrutinises the role of social interaction, friends and family influence on illicit opiate use. Therefore, there is a need for regular epidemiological surveillance and investigations into multilevel, value-based, comprehensive, and strategic long-term intervention plans to curb the opioid problem in the region.

Introduction

Opiate use disorders and overdoses are an emerging global health concern. Both prescriptions and non-clinical indications contribute to the escalating global opioid use disorder problem (OUD). The opioid crisis has metamorphosed through the Use of: methadone in 1999, heroin in 2010, and the current wave of a combination of heroin, counterfeit pills, and cocaine [18]. An estimated 62 million people globally used opioids in 2019, and 36.3 million were impacted by its associated problems [9]. In the US estimated use has increased from 70029 in 2020 to 80816 in 2021 [10], and in Canada, 7560 opioid-related fatalities occurred in 2021 [11]. In Italy opioid addiction affects more than five people per 1000 [12], while a regional study in Germany conducted amongst 57 million adults, found opioid prescription prevalence of 38.7 or 12.8/1000 persons of low- and high-potency opioids in 2020 [13]. However, little is known about the epidemiological characteristics in Sub-Saharan Africa.

There are reports of opioid abuse, although not specifically on opioid fatal overdose or its related disorders, in some African countries, including Egypt, Nigeria, Kenya, Tanzania, and South Africa [1424]. Some of these studies report the increasing use of tramadol and heroin among university and secondary school students, factories and site workers, long-distance drivers, sex workers, as well as unemployed youth [1416,23,24]. However, in many other African countries, there is scanty or no information regarding the ongoing opioid crisis.

The findings on the reason for illicit opioid use includes; pleasure-seeking, craving, habits, impulsivity, improving energy [25], relieving stress [26], peer pressure from friends [27], engendering “morale” and “courage” to engage in sex work and “fight” potentially abusive clients [28]. Some of the reported sources are the black market [29], friends and drug dealers [30], roadways, bus terminals or intercity stands, low-income residential areas, abandoned or unfinished buildings, and fishing camps along the Indian Ocean [31].

Global opioid trafficking channels exist from Afganistan, through the india ocean and East Africa to the west [19,32,33]. This impacts heroin use among the population living in the coastal region of Comoros, Tanzania, Kenya, northern Mozambique, Madagascar, Mauritius and Seychelles [3436]. Unlawful use of opioids could aggravate the already sporadic spread of infectious diseases like malaria, cholera, and HIV [3741]. In 2018, the UNODC [42,43] predicted with insufficient evidence that another opioid crisis was developing in Africa. Inadequate vital record-keeping and surveillance systems make it challenging to comprehend the incidence burden and effects of opioid overdose in Africa [44].

The rationale for this scoping review

Globally, opioid overdose and deaths are increasing, but little is known about these issues in resource-limited regions of Africa. In Africa, the burden of unlawful use of opioids, overdose deaths, and other disorders remains unquantified, and knowledge and access to possible interventions are generally limited. Again, many poor resource settings in Africa lack reliable vital records, and limited surveillance and epidemiological data have limited our understanding of the prevalence and consequences of the opioid crisis in the region [45]. Opioid issues may be hitting hard on the African continent in combination with the accelerated spread of infectious diseases like HIV [46,47], and the lack of resources available to solve these concerns may impede future advancement towards challenging objectives of the Joint United Nations Programme on HIV/AIDS [4850]. A Scoping review on the burden of unlawful use of opioids and epidemiological characteristics in Africa will highlight the contributing drivers, public health risk factors and reason for use for effectiveness in control/management and intervention of the brewing opioid crisis in the region. The study aims to synthesise scientific evidence on epidemiological data on unlawful use of opioid/ abuse, the contributing drivers, the reason for use, sources and the impact on public health in the region.

Materials and methods

The study was conducted to answer the questions on evidence available from the existing literature on epidemiological data on unlawful use of opioid/ abuse, the contributing drivers, the reason for use, and prevention and management on the ongoing opioid-overdose crisis epidemic. The scoping review was guided by the Population, Concept, and Context (PCC) approach developed by Joanna Briggs Institute (JBI) [51,52], details in step outline in the protocol (Onohuean and Oosthuizen 2024).

The population of interest (all African countries or within the African continent), the concept covers (epidemiological data, interventions and outcomes). Details include the epidemiological characteristics, prevalence, incidences of unlawful use of opioid/ abuse, the contributing drivers, the reason for use, sources and the impact on public health in the region. Also, reported informations on evidence-based drugs medication of opioid use disorder (MOUD), or Medication-Assisted Treatment (MAT) that is the FDA-approved medication used in conjunction with a psychosocial intervention such as (methadone, buprenorphine and naltrexone) [53,54], evidence-based interventions to prevent the spread of blood-borne pathogens associated with opioids overdoses, such as needle and syringe programs (NSPs), psychoeducation program, Recovery Solutions for Opioid Patients (RSOP) [55], campaigns or advocacy or training, opioids surveillance, prescription drug monitoring programs, findings/conclusions and any additional interventions mentioned by the authors of the studies included were reviewed and meta-synthesised. The context refers to studies that were undertaken in Africa. Types of evidence sources were sources of evidence that cover studies irrespective of study design, such as quantitative studies (e.g., experimental, quasi-experimental, prospective and retrospective cohort, case-control, cross-sectional, community or population-based), observational studies (e.g., case series, individual case reports, descriptive cross-sectional studies), qualitative studies, and mixed-methods studies [52,56,57].

Search strategy

The keywords relevant to the overarching questions’ characteristics were developed to retrieve data on epidemiology, prevalence, opioids and types as details in the supplementary file (Text A1). The keyword was searched in title specific on the three databases; PubMed, WOS, Scopus and other references.

Study selection

The Preferred Reporting Items for Systematic Reviews and Meta-Analyses extension for Scoping Reviews (PRISMA-ScR) were followed for the study selection process [58]. All identified research articles written in English from 1990 till 2022 were retrieved on 25 June 2022 at 2:15 PM and updated on 17 December 2022 at 12:05 AM. The data set was merged and normalised in ScientoPy and fBasics R-packages, and duplicates were removed and compiled to save in CSV or Excel file [5961].

Inclusion and exclusion criteria

The following qualifying requirements were applied in order to include studies: research that was done in the Africa continent, reported on any opioids such as natural (morphine, codeine, and thebaine (paramorphine); semi-synthetic (hydromorphone, hydrocodone, oxycodone, and heroin); fully synthetic (fentanyl, pethidine, levorphanol, methadone, tramadol, and dextropropoxyphene), or reported opioids with other substance or in combination were eligible for inclusion. Also, studies that report mainly on the outcomes of unlawful opioid use such as incident, prevalence, mortality rates, illicit uses and opioids identified by Diagnostic and Statistical Manual of Mental Disorders (DSM-5) codes or urinary analysis, log book, law enforcement or police record, toxicological investigation, autopsy, postmortem, or determined by Substance Abuse and Mental Health Services (SAMHSA). However, research meeting abstracts, proceedings papers, editorial materials, notes, letters, review or mata-analysis review articles, early access, book chapters, news items, reprints, conference paper, short survey, opioids used in cancer treatment, opioid study based on animal experiments, studies that has no total population or cases, other substance abuse without any opioid uses, opioid associated with Covid 19 or HIV or cancer or any terminal illiness, articles on machine learning, other languages not English, e.g., French were not qualified and were excluded. While, there were no limitations to study design or method or sample size or age or sex or type of opioids and along with other drugs.

Data extraction

The two authors (HO and FO) separately examine the titles and abstracts of the retrieved dataset for possibly suitable papers. Studies that where not conducted in Africa, or literature reviews, systematic reviews, conference abstracts, and opinion publications, were omitted. The selected studies’ full texts were carefully examined, and the findings corresponding to the scoping review objective(s) and the information on authors, year of publication of the article, the country where the study was conducted, study design and setting, epidemiological characteristics, prevalence, age group (year), sex, common opioid abuse, sources of drugs, reasons, type of intervention/ summary outcomes/conclusions extracted in the data extraction form. At the same time, issues over eligibility were resolved through debate and consensus among authors. The primary research investigators were contacted when necessary to get any missing data/information from their studies.

Results

Literature search summary

Sixty-eight (n = 68) eligible articles were included in the meta-synthesis in this study, while 49 papers were excluded at full-text review, including papers on opioid prescriptions in cancer treatment (n = 20), opioid on animal experiments (n = 5), articles with no report of the population (n = 11), substance abuse with no apparent opioid uses (n = 6), opioid associated with Covid 19 and HIV (n = 5), and publication using machine learning (n = 2) as depicted in Fig 1.

thumbnail
Fig 1. PRISMA study selection flowchart in the scoping review.

https://doi.org/10.1371/journal.pone.0317036.g001

Included studies characteristics

Between 1990 and 2022, the number of published articles in the African region has increased, and most 50 (73.53%) of the papers presented in the scoping review were published within the last 12 years. A total population sample of 55132 participated in these studies, with the largest sample size of 17260 (31.31%) reported in South Africa [62], 11281 (20.46%) in Egypt [63] and 4068 (7.38%) Ethiopia [64]. The gender of the participants was indicated in 65 (95.59%) papers, and breakdowns were 5 (7.35%) male and 7 (10.29%) female, and 53 (77.94%) both genders. The age bracket reported in 57 (83.82%) papers was mean, median age ranged between 15.9 and 38 years, and median age 22 and 31, as detailed in Table 1.

thumbnail
Table 1. Overall characteristics of the studies meta-synthesised in the scoping review.

https://doi.org/10.1371/journal.pone.0317036.t001

Study design

The majority of the studies had a cross-sectional observational study and cross-sectional study design 44 (64.71%), were as informed interview questionnaire 9 (13.24%), experimental conformation identification test and urine screen 6 (8.82%), ethnographic research design 2 (2.94%), retrospective study 2 (2.94%), mixed exploratory methods study 2 (2.94%), secondary data collection by qualitative survey 1 (1.47), focus groups 1 (1.47%), case presentations 1 (1.47%) Table 1.

Study setting

Sixty-four articles of the reported studies indicate the study settings. Majority of the studies settings include; community and urban community 15 (22.06%), hospital (neuropsychiatric hospital and Psychiatric hospital) 15 (22.06%), university students 11 (16.18%), secondary school students 6 (8.82%), commercial drivers and assistants, construction and textile industries workers 2 (2.94%), medical school students 2 (2.94%), regional survey 2 (2.94%), rehabilitation camp and treatment centre 2 (2.94%), laboratory 1 (1.47%), local government 1 (1.47%), military officers 1 (1.47%) nation-wide survey 1 (1.47%) general public 1 (1.47%) sex worker 1 (1.47%), hard-to-reach populations 1 (1.47%), Kenyan coast 1 (1.47%) Table 1.

Epidemiology of unlawful opioid use in the African region

In many African countries, misuse of opioids and other drugs continues to grow with little mainstream research notice, while some regions have no reported data. The epidemiological distributions of the majority of the identified articles were reported in nine Africa countries and West Africa (mixed countries), including South Africa 19615 (35.60%), Egypt 14627 (26.54%), Nigeria 5895 (10.70%), Ethiopia 4993 (9.06%), Kenya 4018 (7.29%), Tanzania 2393 (4.34%), Cameroon 1502 (2.735), Ghana 862 (1.56%), Sudan 817 (1.48%), West Africa 384 (0.70%) Fig 2.

thumbnail
Fig 2. Distribution of opioid uses among the African countries of the meta-synthesised studies in the scoping review.

https://doi.org/10.1371/journal.pone.0317036.g002

Commonly unlawful used opioids in the African countries

The most commonly abused opioids reported in the included 68 studies are as follows: 14 (20.59%) papers reported misused of heroin only, heroin & others (alcohol, tobacco, cannabis, cigarettes, marijuana, khat, caffeine, magic mushroom, methylphenidate) were reported in 17 (25%) papers, heroin & cocaine was presented in 5 (7.35%), only tramadol 8 (11.76%), and tramadol & heroin documented in 6 (8.82%) articles details in Fig 3.

thumbnail
Fig 3. Percentage distribution of the commonly unlawful used opioids and other drugs among the meta-synthesised studies in the scoping review.

https://doi.org/10.1371/journal.pone.0317036.g003

Sources of opioids drugs among the African countries

Most studies do not indicate the sources of opioid use in the reported studies of African countries. However, only nine (13.24%) papers reported sources such as the black market, friends and drug dealers being the major source of tramadol [29,30,72]. Heroin hotspots include roadways, concentrating near bus terminals or intercity stands, low-income residential areas, abandoned or unfinished buildings, and fishing camps along the Indian ocean [31]. According to the report of [26,111], tramadol, tobacco, cannabis, alcohol, amphetamines, tranquillisers, inhalants, opiates, cocaine, and heroin were sourced by peers in most regions. Codeine is sold by retail pharmacies, internet and patent medicine vendors [102]. Other sources for tramadol were street-level markets [117]. Cannabinoid, fub-amb (methyl(2s)-2-{[1-[(4-fluorophenyl), methyl] indazole-3-carbonyl]amino}-3 methyl butanoate) and mixed opiates where gotten by Voodoo [71].

Reasons for opioids use among the African countries

Twenty (29.41%) papers assessed the reason for unlawful use of opioids in the African region. The study by [26] in Cameroon, indicate substance use was to relieve stress. The major reason for opioid use covered in Egyptian studies included; physical, e.g., pain and premature ejaculation or psychological, e.g., mood or sleep-related problems [29]. The study by [30] highlighted improved mood, relief of pain and help to continue work. In the study by [27], peer pressure from friends stood out as the most common reason to start and continue using substances. Also, [25] reported pleasure-seeking, craving, habits, impulsivity, improved energy, staying awake, and deepening insights as the proper factors for opioid use. Similar reasons of peer influence and getting energised, were reported by [75] in Ethiopia. The study in Ghana reported pain relief and sexual enhancement as the main purpose for use [16]. However, the report of [28] in Kenya highlighted “engender “morale” and “courage” to engage in sex work and “fight” potentially abusive clients”. The report from studies in Nigeria’s literatures were not so different from other countries in the region. Among them were to control nausea and vomiting during early pregnancy [73], cultural expectations [91], to enhance their academic performance [94], to enhance their farming livelihood practices and withstand stress during farming [99]. Also, peer pressure and low level of national regulations [92], while relief from stress, self-medication to treat illness and staying awake at night to study was reported by [98]. Again, relieving tiredness and prolonged sex, cheap prices and ease of access were documented by [101], while [90] reported unemployment and poor educational status as the reason for use. In South Africa, the study of [106] documented adjusting to a new social environment or adapting to the academic load and responsibilities, peer pressure, social activities and external factors. Ecstasy stimulants enhance libido (female sex worker), injection enhances the sexual experience, snorting prolongs sexual stamina, and anal administration builds confidence (male) were reported by [31]. The study by [111] in Sudan reported curiosity as the reason for the initiation of substance use, pleasure, relief of psychological stress, and relief of fatigue. In Tanzania, similar reasons, including peer pressure, fun, family problems and influence from family, were motives for commonly used [21].

Summary outcomes and future engagement on the burden of unlawful use of Opioid and epidemiological characteristics in Africa

The summary outcomes and future engagement is highlighted in Table 2. Future studies may focus on the elements that influence incentives to change in regard to illicit opioid drug use and are likely to focus on views of the impact on social relationships, the social context of the situation, and the behaviours of friends and family that influence the patients to think about changing. The findings of this scoping review have presented the suggestion of investigators that multilevel, value-based, comprehensive, and strategic long-term intervention plans are some requirements for curbing the opioid problem [26]. Population-based longitudinal studies are needed to investigate tramadol use and the possible role of tramadol as a gateway drug [69]. Expanding coverage of current laws and occupational safety and health standards to cover workers in the informal sector, especially in developing countries, was recommended by Abbas et al., 2013 [68]. Deyessa et al., 2020 [64] suggested the implementation of the essential harm reduction strategies given by the world health organisation. Community awareness and training on needle syringe programs (NSP), and assisted therapy (MAT) were proposed by Oguya et al., 2021 [82]. Lingering on access to naloxone to lay people and community and peer-based opioid overdose prevention training in Tanzania was recommended by Saleem et al., 2021 [33], which could also be spread to other Africa nations. Psychiatric comorbidities associated with heroin use disorders patients underscore the need for substance treatment services with the capacity to diagnose and manage these comorbidities [109].

thumbnail
Table 2. Summary findings for future engagement on the Burden of Unlawful Use of Opioid and Epidemiological Characteristics in Africa.

https://doi.org/10.1371/journal.pone.0317036.t002

Discussion

This scoping review is done at a time when there is a global upsurge of opioid misuse and other related disorders, but little mainstream research attention is paid to the problem on the African continent, especially in resource-limited settings. However, we are confident that mapping the breadth and depth of research on the unlawful use of opioid will trigger stakeholders and government response in the African region. Here, we examine a growing corpus of research on the unlawful use of opioids and exclude opioid prescriptions or medications. We did not attempt to evaluate the quality of the included research articles since the scoping review made no assertions or conclusions about the findings. However, the gaps in the synthesised scientific evidence covering over three decades could aid in directing researchers and policymakers in managing the opioid crisis in Africa.

Epidemiology of unlawful use of opioid in the Africa population

We found 68 original research papers discussing different illicit opioid use in Africa between 1990 and 2022 (32 years). The majority of the studies were from West Africa (Nigeria), Central (Egypt), East Africa (Keyan and Tanzania), and Southern (South Africa) regions. It affects all ages. The rising illicit use of opioids and other drugs is poorly documented in Africa with zero statistics.. The paucity of epidemiologic information about unlawful use of opioid and overdose in the literature reviewed making it difficult to understand the opioid crisis in Africa.

We found few published articles on the prevalence of opoid usage, but these lack the detail of overdose crisis [2,119,120]. The methodological approach for opioid research in Africa is constrained and most of the assessment window’s timing, population and the tools employed varied. A study on Nation-wide, secondary school and university students, rural and urban communities, and hospitals, showed the evolving consequences of unlawful use of opioid and related disorders. Additionally, it was uncommon for most studies to distinguish between occasional opioid usage (e.g., tried many times in the past week) and single-use (e.g., tried once in a lifetime), and verified clinical diagnoses were not published at all. Most publications were cross-sectional investigations without effort at participant follow-up or extended beyond the cohort. Also, few studies went beyond straightforward descriptions, correlations or risk factors, and it was uncommon for any underlying theories or conceptual models to be articulated. Lastly, a good number of studies focuses on people living with HIV and students as particularly high-risk groups, while scant evidence regarding unlawful use of opioid in other vulnerable population such as hard labourers, unemployed, internally displaced (refuges camp), students with co-occurring mental health issues etc.

Demographic and burden of unlawful use of opioid in the African region

In Africa, the burden of unlawful use of opioid is not limited to specific demographics such as sex, age, occupation or population, only with some levels of variations, despite a variety of demographic, psychological, and social characteristics that have been linked to drug use in various studies [32,121,122]. The Sub-Saharan African region has been estimated to experience about a 130% increase in the burden of mental health, substance use disorders, and disability [32]. This main, further weekend, the already over-stressed health system with poor full-time equivalent (FTE) staffing needs for the health industry was estimated to be far lower than the actual FTE staffing levels recommended [123]. Nevertheless, due to a lack of estimated data and paucity of epidemiologic or clinical evidence on opioid overdoses, fatalities and other related disorders in the literature reviewed, the public health burden may be underreported. However, our findings highlighted the African nation’s distribution: young adults have been the most vulnerable population, and heroin, tramadol, and in combinations with other opioids or combination with other classes of substances are frequently misused in the region. This indicates a public health concern with other risk factors such as terrorism, violence, and the spread of infectious diseases, which require an urgent surveillance system, treatment/counselling centre and research centre for strategic prevention implementation.

Specifically, abuse of tramadol and codeine is a widespread, disturbing occurrence in the Egyptian community [25,30,72]; Nigeria [87,101], Ghana [16] particularly among secondary and university students, unemployed and long-distance drivers. Due to their easy availability on the over-the-counter (OTC), black market, low cost, and effectiveness in treating premature ejaculation, it became the most often used drug among young people and adults. However, studies reported that most work labourers and long-distance drivers admitted that tramadol helped them keep up with daily tasks, have a positive attitude, be more friendly, and not feel exhausted to accomplish challenging tasks and prevent withdrawal symptoms. This notion indicated a need for public awareness and re-orientation of the adverse effects of tramadol misuse and an awareness of regulatory authorities. At the same time, severe pain, myalgia, sleeplessness, and autonomic signs such as diarrhoea, rhinorrhea, lacrimation, and nausea were the most distressing side effects of tramadol withdrawal [72]. Heroin is also common misuse in Ethiopia [64,74], South Africa [105,107], and Western Kenya [79,80,86], while injecting heroin is becoming a more significant public health issue in Tanzania [21,28] with high potential of spreading to the country’s neighbouring regions, including Uganda, and Rwanda. Heroin trafficking and consumption have gradually increased in Tanzania over the past ten years. These implied that the East Africa nations must start assessing the likelihood of heroin use in their regions. Due to the increasing use of African trade routes by global opioid trafficking channels, the use of opioids for non-clinical purposes has increased in the continent [32,121,124].

The most alarming age population is 12-30. People in their midlife or potential life have been substantially connected with increased opioid fatal overdoses [125]. Opioid drug misuses such as morphine, codeine, hydrocodone, fentanyl, methadone, dextropropoxyphene, heroin, and tramadol, have now become a common component of adolescent experimentation, socialisation, risk-taking, and reward-seeking, especially done among a specific young group of people [126]. Sex workers often use opioid drugs such as heroin and fentanyl to enhance sexual performance, as a coping mechanism, to gain the courage to approach clients and endure the harsh street environment [126128] with severe implication for sexually transmitted infections (STIs).

Looking at the age variability in our findings, the years spent in high school and traditional universities, differs [129,130] and there is a positive correlation between adolescence, adulthood and the emergence of substance use disorders due to adverse childhood experiences (ACEs) [131]. Also, self-reliance from parents, new communal and intimate connections alongside peers, increased access to drugs and alcohol, and the need for independent learning all give to a distinctive social environment which is at a phase of development that is characterised by the highest levels of risk-taking and its associated behavioural, mental health problems [132134]. This is one of the certain utterly lacking crucial potential investigation areas based on this scoping review.

The discrepancy between adequate use and need for opioids in Africa

The problem of unlawful use of opioids highlighted in this study is undeniably concerning, particularly in light of its impact on patients who genuinely require opioids for medical reasons, such as those suffering from cancer, HIV, palliative care, or terminal illness etc. While the study sheds light on the issue of illicit use, it is crucial to also recognize the significant problem of undertreatment of pain in many parts of the world, particularly on the African continent [135,136]. Also, reports and the official data from the United Nations and the World Health Organization (WHO) reveal the stark reality of the undertreatment of pain in Africa [137139], where there is a scarcity and limited availability of opioids for medical use. This shortage of essential medications has dire consequences, leading to thousands of individuals enduring unnecessary suffering and experiencing inhumane deaths due to the lack of access to adequate pain relief.

While addressing the opioid abuse crisis is crucial, it is equally important to address the systemic barriers that prevent access to essential pain management medications for those who desperately need them. This underscores the urgent need for comprehensive strategies and policy interventions to ensure equitable access to pain relief medications for all individuals, regardless of their geographical location or socioeconomic status.

Summary outcomes, prevention, treatment and future engagement

Our finding further shows an increasing illicit opioid drug use, which could soon reach or escalate to alarming levels in Africa, if not unnoticed, due to poor surveillance systems. Tramadol and heroin are commonly misused among adolescents in the region with the impact of attention-deficit/hyperactivity disorder (ADHD). However, our scoping review found insufficient published research on opioid drug-related harm reduction or prevention in the region. Psychological services or behavioural therapies for young stars and school students suffering from mental health issues associated with opioid abuse are completely lacking. This may be due to poor data from mainstream research for public awareness of the opioid crisis in the region or a result of the sluggish stakeholder response to unlawful use of opioid and its potential dangers, as well as the negative effects of stigma and legality on attempts to get help. Also, there is no report on clinical trials tailored towards delivering interventions to adolescence or adulthood-specific opioid issues in the region.

This review suggests more investigation is needed to comprehend better the mechanisms underlying adolescent and adulthood drug use and associated mental health issues

  • Establishing a rehabilitation centre to correct and reform addicts or specific behaviours related to unlawful use of opioid at the early-stage diagnosis.
  • surveillance initiatives and characterisation of overdose is recommended.
  • Furthermore, multilevel, comprehensive, value-based, and strategic long-term intervention plans are needed.
  • introduction of community peer-modeling strategies or techniques.
  • • the engagement of satkeholders in sensitise young people, about illicit opioid use and its adverse impacts.
  • Research engaging relevant demographics in the design of interventions for opioid uses and other drugs of abuse may boost acceptability, adherence and implementation.
  • brief in-person and motivational intervention delivery may be promising.
  • Continuous tracking young star opioid drug and alcohol use is essential if effective evidence-based policy and intervention initiatives are to be developed.
  • studies could be focused on prevalence and risk assessment of opioids abuse in the Africa continent as recommendation.
  • evaluations of novel theoretically based prevention and treatment strategies that consider recognised risk factors for opioid use and disorders.

Research limitations

Among the limitations of this scoping review is the restriction of articles written in English as mandated by inclusion criteria, while documents written in French were excluded. Additionally, no quantitative data analysis was performed in this study that could have questioned or supported our findings.

Conclusion

Our scoping review has shown significant gaps in the body of research on opioid usage in the Africa continent. The findings are evident on the epidemiological distribution of the unlawful use of opioids among young adult, drivers and manual labor in both genders. Evidence-based healthcare assessment and regulations of the illicit sources or contributing drivers to inform prevention and management strategy. The reasons for use underscores the need to examining the social interactions impact, the actions of friends and family that influence unlawful opioid uses.

Supporting Information

S1 File. Preferred Reporting Items for Systematic reviews and Meta-Analyses extension for Scoping Reviews (PRISMA-ScR) Checklist.

https://doi.org/10.1371/journal.pone.0317036.s001

(DOCX)

References

  1. 1. Centers for Disease Control and Prevention (CDC). Vital signs: overdoses of prescription opioid pain relievers---United States, 1999--2008. MMWR Morb Mortal Wkly Rep. 2011.
  2. 2. Rudd R, Paulozzi L, Bauer M, Burleson R, Carlson R, Dao D, et al. Increases in heroin overdose deaths - 28 States, 2010 to 2012. MMWR Morb Mortal Wkly Rep. 2014.
  3. 3. Hedegaard H, Chen L-H, Warner M. Drug-poisoning Deaths Involving Heroin: United States, 2000–2013 Key findings Data from the National Vital Statistics System (Mortality). NCHS Data Brief. 2015.
  4. 4. Gladden RM, Martinez P, Seth P. Fentanyl Law Enforcement Submissions and Increases in Synthetic Opioid–Involved Overdose Deaths — 27 States, 2013–2014. MMWR Morb Mortal Wkly Rep. 2016. doi:10.15585/mmwr.mm6533a2
  5. 5. O’Donnell JK, Gladden RM, Seth P. Trends in Deaths Involving Heroin and Synthetic Opioids Excluding Methadone, and Law Enforcement Drug Product Reports, by Census Region — United States, 2006–2015. MMWR Morb Mortal Wkly Rep. 2017.
  6. 6. O’Donnell JK, Halpin J, Mattson CL, Goldberger BA, Gladden RM. Deaths Involving Fentanyl, Fentanyl Analogs, and U-47700 — 10 States, July–December 2016, Morbidity and Mortality Weekly Report (MMWR). In: Centers for Disease Control and Prevention MMWR Office. 2017.
  7. 7. Liu S, Gladden Ma, Vivolo-Kantor AM, Seth P. Trends in Suspected Opioid Overdoses from Emergency Departments in 11 States and DC. OJPHI. 2019;11(1).
  8. 8. DEA. 2019 National Drug Threat Assessment. Drug Enforcement Administration. 2019.
  9. 9. UNODC 2021, Crime UNO of D and. World Drug Report 2021 - Drug Market Trends: Cannabis Opioids. In: World Drug Report 2021. 2021.
  10. 10. CDC. U.S. Overdose Deaths In 2021 Increased Half as Much as in 2020 - But Are Still Up 15%. 2022 [cited 8 Jul 2022]. Available from: https://www.cdc.gov/nchs/pressroom/nchs_press_releases/2022/202205.htm
  11. 11. Public Health Agency of Canada. Special Advisory Committee on the Epidemic of Opioid Overdoses. Opioid- and Stimulant-related Harms in Canada. Ottawa. 2022 [cited 8 Jul 2022]. Available from: https://health-infobase.canada.ca/substance-related-harms/opioids-stimulants/
  12. 12. Stigliano G, Miuli A, Lalli A, Alessi MC, Sociali A, Esposito F, et al. An Italian survey of opioids misuse: Epidemiological and psychopathological aspects. Emerging Trends in Drugs, Addictions, and Health. 2021;1:100029.
  13. 13. Jobski K, Dörks M, Bantel C, Hoffmann F. Regional differences in opioid prescribing in germany - results of an analysis of health insurance data of 57 million adult people. J Pain Res. 2020;132483–92. pmid:33116790
  14. 14. Ikhayere JI, Babalola AI, Yelwa M. Effect of substance abuse on nigeria’s economic performance. IJSSER. 202035–46.
  15. 15. UNODC. Nations Office on Drugs and Crime (UNODC) Survey on Drug Use in Nigeria 2019. 2018; 1–63. Available: https://www.unodc.org/documents/nigeria//Drug_Use_Survey_Nigeria_2019_BOOK.pdf
  16. 16. Danso M, Anto F. Factors associated with tramadol abuse: a cross-sectional study among commercial drivers and assistants in the accra metropolitan area of Ghana. Drugs Real World Outcomes. 2021;8(3):337–47. pmid:33909271
  17. 17. United Nations Office on Drugs and Crime (UNODC). Analysis of drug markets: Opiates, cocaine, cannabis, synthetic drugs (World Drug Report 2018). United Nations. 2018.
  18. 18. Salm-Reifferscheidt L. Tramadol: Africa’s opioid crisis. Lancet. 2018;391(10134):1982–3. pmid:29864013
  19. 19. Economist. Drugs smuggling in Africa: The Smack Track. Econ (United Kingdom). 2015.
  20. 20. Ratliff EA, McCurdy SA, Mbwambo JKK, Lambdin BH, Voets A, Pont S, et al. An Overview of HIV Prevention Interventions for People Who Inject Drugs in Tanzania. Adv Prev Med. 2013;2013:183187. pmid:23346410
  21. 21. Tan AX, Kapiga S, Khoshnood K, Bruce RD. Epidemiology of Drug Use and HIV-Related Risk Behaviors among People Who Inject Drugs in Mwanza, Tanzania. PLoS One. 2015;10(12):e0145578. pmid:26701616
  22. 22. Tiberio J, Laurent YI, Ndayongeje J, Msami A, Welty S, Ngonyani A, et al. Context and characteristics of illicit drug use in coastal and interior Tanzania. Int J Drug Policy. 2018;51:20–6. pmid:29156310
  23. 23. Ngarachu EW, Kiburi SK, Owiti FR, Kangethe R. The prevalence and pattern of cannabis use among patients attending a methadone treatment clinic in Nairobi, Kenya. Subst Abuse Treat Prev Policy. 2022;17(1):12. pmid:35168646
  24. 24. Lelei K, Muteti J, Okioma V, Njenga A. Policy Brief on National Survey on Alcohol and Drug Abuse among Secondary School Students in Kenya. Volume 3: June 2020. 2021.
  25. 25. AbdelWahab MA, Abou El Magd SF, Grella CE, Enaba DA, Abdel Maqsoud R. An examination of motives for tramadol and heroin use in an Egyptian sample. J Addict Dis. 2018;37(3–4):123–34. pmid:31264937
  26. 26. Metuge CE, Dzudie A, Ebasone PV, Assob JCN, Ngowe MN, Njang E, et al. Prevalence and factors associated with substance use among students in tertiary institutions in Buea, Cameroon. Pan Afr Med J. 2022;41:103. pmid:35432698
  27. 27. Loffredo CA, Boulos DNK, Saleh DA, Jillson IA, Garas M, Loza N, et al. Substance use by Egyptian youth: current patterns and potential avenues for prevention. Subst Use Misuse. 2015;50(5):609–18. pmid:25629955
  28. 28. Syvertsen JL, Agot K, Ohaga S, Bazzi AR. You can’t do this job when you are sober: Heroin use among female sex workers and the need for comprehensive drug treatment programming in Kenya. Drug Alcohol Depend. 2019;194:495–9. pmid:30529906
  29. 29. Bassiony MM, Abdelghani M, Salah El-Deen GM, Hassan MS, El-Gohari H, Youssef UM. Opioid Use Disorders Attributed to Tramadol Among Egyptian University Students. J Addict Med. 2018;12(2):150–5. pmid:29334513
  30. 30. Abd-Elkader MR, Kabbash IA, El-Sallamy RM, El-Sawy H, Gad E-SA-H. Tramadol abuse among workers in an industrial city in mid-Nile Delta region, Egypt. Environ Sci Pollut Res Int. 2020;27(30):37549–56. pmid:32124298
  31. 31. Needle R, Kroeger K, Belani H, Achrekar A, Parry CD, Dewing S. Sex, drugs, and HIV: rapid assessment of HIV risk behaviors among street-based drug using sex workers in Durban, South Africa. Soc Sci Med. 2008;67(9):1447–55. pmid:18678437
  32. 32. Kurth AE, Cherutich P, Conover R, Chhun N, Bruce RD, Lambdin BH. The Opioid Epidemic in Africa And Its Impact. Curr Addict Rep. 2018;5(4):428–53. pmid:32494564
  33. 33. Saleem HT, Likindikoki S, Nonyane BAS, Haruna Nkya I, Zhang L, Mbwambo J, et al. Correlates of Non-fatal, Opioid Overdose among Women Who Use Opioids in Dar es Salaam, Tanzania. Drug Alcohol Depend. 2021;218108419. pmid:33296857
  34. 34. Moonien V, Riana |, Randrianarisoa R. Lucia Bird | Julia Stanyard The evolving illicit drug trade in the western Indian Ocean. 2021.
  35. 35. UNODC. Transnational Organized Crime In Eastern Africa: A Threat Assessment. 2013 [cited 14 Jul 2022]. Available from: www.unodc.org
  36. 36. Haysom S, Gastrow P, Shaw M. The heroin coast: A political economy along the eastern African seaboard. 2018.
  37. 37. World Health Organization. World Malaria Report 2015. 2015.
  38. 38. Ali M, Nelson AR, Lopez AL, Sack DA. Updated global burden of cholera in endemic countries. PLoS Negl Trop Dis. 2015;9(6):e0003832. pmid:26043000
  39. 39. Onohuean H, Alagbonsi AI, Usman IM, Iceland Kasozi K, Alexiou A, Badr RH, et al. Annona muricata Linn and Khaya grandifoliola C.DC. Reduce Oxidative Stress In Vitro and Ameliorate Plasmodium berghei-Induced Parasitemia and Cytokines in BALB/c Mice. J Evid Based Integr Med. 2021;26:2515690X211036669. pmid:34350806
  40. 40. Onohuean H, Okoh AI, Nwodo UU. Epidemiologic potentials and correlational analysis of Vibrio species and virulence toxins from water sources in greater Bushenyi districts, Uganda. Sci Rep. 2021;11(1):22429. pmid:34789791
  41. 41. Onohuean H, Onohuean EF, Atim SG, Igere BE, Iweriebor BC, Agwu E. Meta-synthesis of research dynamics on HIV/AIDs related pre-exposure prophylaxis (PrEP): Africa perspective. Journal of Medicine, Surgery, and Public Health. 2023;1100010.
  42. 42. UNODC. Executive summary — Conclusions and policy implications. 2018.
  43. 43. UNODC. World Drugs Report 2019. Competitiveness and Knowledge. 2018.
  44. 44. Wilson M, Brumwell A, Stowe MJ, Shelly S, Scheibe A. Personal experience and awareness of opioid overdose occurrence among peers and willingness to administer naloxone in South Africa: findings from a three-city pilot survey of homeless people who use drugs. Harm Reduct J. 2022;19(1):17. pmid:35148779
  45. 45. Onohuean H, Oosthuizen F. Multinational appraisal of the epidemiological distribution of opioid fatalities: a systematic review and meta-analysis. Front Psychiatry. 2024;14:1290461. pmid:38250280
  46. 46. Lekoane KMB, Kuupiel D, Mashamba-Thompson TP, Ginindza TG. The interplay of HIV and human papillomavirus-related cancers in sub-Saharan Africa: scoping review. Syst Rev. 2020;9(1):88. pmid:32321580
  47. 47. Onohuean H, Jr EOA, Igere BE. Meta-synthesis and science mapping analysis of HIV/ HPV co-infection: a global perspective with emphasis on Africa. 2022; 1–20.
  48. 48. UN Joint Programme on HIV/AIDS (UNAIDS). 90-90-90 An ambitious treatment target to help end the AIDS epidemicto help end the AIDS epidemic. United Nations. 2014.
  49. 49. WHO. An ambitious treatment target to help end the AIDS epidemic. Unaids. 2016.
  50. 50. Galvani AP, Pandey A, Fitzpatrick MC, Medlock J, Gray GE. Defining control of HIV epidemics. Lancet HIV. 2018;5(11):e667–70. pmid:30314745
  51. 51. Peters MDJ, Godfrey CM, Khalil H, McInerney P, Parker D, Soares CB. Guidance for conducting systematic scoping reviews. Int J Evid Based Healthc. 2015;13(3):141–6. pmid:26134548
  52. 52. Aromataris E MZ (Editors). About this Manual - JBI Reviewer’s Manual. In: oanna Briggs Institute Reviewer’s Manual. 2017
  53. 53. Topmiller M, Mallow PJ, Vissman AT, Grandmont J. Identifying Priority Areas for Increasing the Supply of Medication-Assisted Treatments for Opioid Use Disorder: A Geospatial Approach. J Health Econ Outcomes Res. 2018;6(1):75–83. pmid:32685573
  54. 54. High PM, Marks K, Robbins V, Winograd R, Manocchio T, Clarke T, et al. State targeted response to the opioid Crisis grants (opioid STR) program: Preliminary findings from two case studies and the national cross-site evaluation. J Subst Abuse Treat. 2020;10848–54. pmid:31303359
  55. 55. Milne EP. Family Recovery Solutions for Opioid Use Disorder Patients: A Historical Cohort Study. ProQuest Dissertations and Theses. 2018.
  56. 56. The Joanna Briggs Institute. Joanna Briggs Institute Reviewer’s Manual. In: The Joanna Briggs Institute. 2014.
  57. 57. Montilla AM, Gómez-García F, Gómez-Arias PJ, Gay-Mimbrera J, Hernández-Parada J, Isla-Tejera B, et al. Scoping Review on the Use of Drugs Targeting JAK/STAT Pathway in Atopic Dermatitis, Vitiligo, and Alopecia Areata. Dermatol Ther (Heidelb). 2019;9(4):655–83. pmid:31606872
  58. 58. Tricco AC, Lillie E, Zarin W, O’Brien KK, Colquhoun H, Levac D, et al. PRISMA Extension for Scoping Reviews (PRISMA-ScR): Checklist and Explanation. Ann Intern Med. 2018;169(7):467–73. pmid:30178033
  59. 59. Onohuean H, Aigbogun EO Jr, Igere BE. Meta-synthesis and science mapping analysis of HIV/HPV co-infection: a global perspective with emphasis on Africa. Global Health. 2022;18(1).
  60. 60. Onohuean H, Akiyode AO, Akiyode O, Igbinoba SI, Alagbonsi AI. Epidemiology of neurodegenerative diseases in the East African region: A meta-analysis. Front Neurol. 2022;131024004. pmid:36468051
  61. 61. Rstudio T. RStudio: Integrated Development for R. Rstudio Team, PBC, Boston, MA URL http://www.rstudio.com/. 2020.
  62. 62. Dada S, Harker Burnhams N, Van Hout MC, Parry CDH. Codeine misuse and dependence in South Africa--learning from substance abuse treatment admissions. S Afr Med J. 2015;105(9):776–9. pmid:26428980
  63. 63. Azab SMS, Tawfik H, Hayes BD. Intoxication related to substances use in patients presenting to Ain Shams University Poisoning Treatment Center, Cairo, Egypt (2015-2019). Drug Alcohol Rev. 2022;41(5):1109–18. pmid:35178787
  64. 64. Deyessa N, Senbete B, Abdo A, Mundia BM. Population estimation and harm reduction among people who inject drugs in Addis Ababa, Ethiopia. Harm Reduct J. 2020;17(1):61. pmid:32894153
  65. 65. Mbanga CM, Efie DT, Aroke D, Njim T. Prevalence and predictors of recreational drug use among medical and nursing students in Cameroon: a cross sectional analysis. BMC Res Notes. 2018;11(1):515. pmid:30055652
  66. 66. El Rasheed AH. Alexithymia in Egyptian Substance Abusers. Subst Abus. 2001;22(1):11–21. pmid:12466666
  67. 67. Bassiony MM, Mahdy RS, Haggag N, Salah Eldeen G. Current attention-deficit/hyperactivity disorder and nonmedical prescription opioid use attributed to tramadol among male adolescents without conduct disorder in Egypt. Am J Drug Alcohol Abuse. 2021;47(5):623–9. pmid:34280063
  68. 68. Abbas R, Hammam R, El-Gohary S, Sabik L, Hunter M. Screening for common mental disorders and substance abuse among temporary hired cleaners in egyptian governmental hospitals, Zagazig city, Sharqia governorate. Int J Occup Environ Med. 2013.
  69. 69. Bassiony MM, Salah El-Deen GM, Yousef U, Raya Y, Abdel-Ghani MM, El-Gohari H, et al. Adolescent tramadol use and abuse in Egypt. Am J Drug Alcohol Abuse. 2015;41(3):206–11. pmid:25859610
  70. 70. Bassiony MM, Youssif UM, Hussein RA, Saeed M. Psychiatric Comorbidity Among Egyptian Patients With Opioid Use Disorders Attributed to Tramadol. J Addict Med. 2016;10(4):262–8. pmid:27253353
  71. 71. Hussien R, Ahmed S, Awad H, El-Setouhy M, El-Shinawi M, Hirshon JM. Identification of “Voodoo”: an emerging substance of abuse in Egypt. Int J Environ Anal Chem. 2022;102(1):104–16. pmid:35002018
  72. 72. Shalaby AS, El-Hady Sweilum OA, Ads MK. Does Tramadol Increase the Severity of Nicotine Dependence? A Study in an Egyptian Sample. J Psychoactive Drugs. 2015;47(3):197–202. pmid:26121025
  73. 73. Mihretu A, Teferra S, Fekadu A. Problematic khat use as a possible risk factor for harmful use of other psychoactive substances: a mixed method study in Ethiopia. Subst Abuse Treat Prev Policy. 2017;12(1):47. pmid:29096691
  74. 74. Demissie M, Johnston LG, Muleta M, Desyebelew D, Belete W, G/Egxiabehre A, et al. Prevalence of HIV and other infections and injection behaviours among people who inject drugs in Addis Ababa, Ethiopia. Afr J AIDS Res. 2018;17(3):259–64. pmid:30319040
  75. 75. Kassa A, Taddesse F, Yilma A. Prevalence and factors determining psychoactive substance (PAS) use among Hawassa University (HU) undergraduate students, Hawassa Ethiopia. BMC Public Health. 2014;14:1044. pmid:25293514
  76. 76. Affinnih YH. Drug use in greater Accra, Ghana: pilot study. Subst Use Misuse. 1999;34(2):157–69. pmid:10069748
  77. 77. Affinnih YH. A preliminary study of drug abuse and its mental health and health consequences among addicts in Greater Accra, Ghana. J Psychoactive Drugs. 1999;31(4):395–403. pmid:10681106
  78. 78. Forson PK, Oduro G, Bonney J, Cobbold S, Sarfo-Frimpong J, Boyd C, et al. Emergency department admissions Kumasi, Ghana: Prevalence of alcohol and substance use, and associated trauma. J Addict Dis. 2020;38(4):520–8. pmid:32664825
  79. 79. Kurth AE, Cleland CM, Des Jarlais DC, Musyoki H, Lizcano JA, Chhun N, et al. HIV Prevalence, Estimated Incidence, and Risk Behaviors Among People Who Inject Drugs in Kenya. J Acquir Immune Defic Syndr. 2015;70(4):420–7. pmid:26226249
  80. 80. Mwatelah RS, Lwembe RM, Osman S, Ogutu BR, Aman R, Kitawi RC, et al. Co-Infection Burden of Hepatitis C Virus and Human Immunodeficiency Virus among Injecting Heroin Users at the Kenyan Coast. PLoS One. 2015;10(7):e0132287. pmid:26208212
  81. 81. Odek-Ogunde M, Pande-Leak D. Prevalence of substance use among students in a Kenyan university: A preliminary report. East Afr Med J. 1999.
  82. 82. Oguya FO, Kenya PR, Ongecha F, Mureithi P, Musyoka H, Muraguri N, et al. Rapid situational assessment of people who inject drugs (PWID) in Nairobi and coastal regions of Kenya: a respondent driven sampling survey. BMC Public Health. 2021;21(1):1549. pmid:34391389
  83. 83. Syvertsen JL, Agot K, Ohaga S, Strathdee SA, Camlin CS, Omanga E, et al. Evidence of injection drug use in Kisumu, Kenya: Implications for HIV prevention. Drug Alcohol Depend. 2015;151:262–6. pmid:25861945
  84. 84. Syvertsen JL, Ohaga S, Agot K, Dimova M, Guise A, Rhodes T, et al. An ethnographic exploration of drug markets in Kisumu, Kenya. Int J Drug Policy. 2016;30:82–90. pmid:26838470
  85. 85. Beckerleg S, Telfer M, Hundt GL. The rise of injecting drug use in East Africa: a case study from Kenya. Harm Reduct J. 2005;2:12. pmid:16122382
  86. 86. Beckerleg S, Telfer M, Sadiq A. A rapid assessment of heroin use in Mombasa, Kenya. Subst Use Misuse. 2006;41(6–7):1029–44. pmid:16809185
  87. 87. Abasiubong F, Atting I, Bassey E, Ekott J. A comparative study of use of psychoactive substances amongst secondary school students in two local government areas of akwa ibom state, Nigeria. Nigerian Journal of Clinical Practice. 2008.
  88. 88. Abdulkarim AA, Mokuolu OA, Adeniyi A. Drug use among adolescents in Ilorin, Nigeria. Trop Doct. 2005;35(4):225–8. pmid:16354478
  89. 89. Adelekan ML, Makanjuola AB, Ndom RJ, Fayeye JO, Adegoke AA, Amusan O, et al. 5-yearly monitoring of trends of substance use among secondary school students in Ilorin, Nigeria, 1988-1998. West Afr J Med. 2001;20(1):28–36. pmid:11505884
  90. 90. Adelekan M, Adeniran R. Rehabilitation and follow-up issues in drug abusers managed at the Neuropsychiatric Hospital, Abeokuta, Nigeria. West African Journal of Medicine. 1991;10(1):1–5.
  91. 91. Ajayi AI, Somefun OD. Recreational drug use among Nigerian university students: Prevalence, correlates and frequency of use. PLoS One. 2020;15(5):e0232964. pmid:32421722
  92. 92. Alabi AD, Runsewe-Abiodun TI, Ogunowo KK. Perception of Substance Abuse Amongst Adolescents and Young Adults in Ikenne Local Government, Ogun State, Nigeria. Int Q Community Health Educ. 2021;42(1):57–61. pmid:33215573
  93. 93. Ekpo M, Adelekan ML, Inem A V., Agomoh A, Agboh S, Doherty A. Lagos “area boys and girls” in rehabilitation: their substance use and psychosocial profiles. East Afr Med J. 1995.
  94. 94. Idowu A, Aremu AO, Olumide A, Ogunlaja AO. Substance abuse among students in selected secondary schools of an urban community of Oyo-state, South West Nigeria: implication for policy action. Afr Health Sci. 2018;18(3):776–85. pmid:30603011
  95. 95. Lasebikan VO, Ijomanta I. Non-medical prescription opioid use and opioid use disorder in the military population in Nigeria. Journal of Substance Use. 2018;24(2):192–8.
  96. 96. Mutihir J, Musa J, Daru P, Nyango D, Audu M. Substance abuse among antenatal patients at jos university teaching hospital, north central Nigeria. J West Afr Coll Surg. 2012;2(2):50–62. pmid:25452983
  97. 97. Okafor CJ, Essien EA, Edet BE, Okoro AC, Udofia O. Drugs of Abuse among In-Patients Receiving Treatment for Substance Use Disorders in a Tertiary Health Care Center in South-South Nigeria: An Exploratory Qualitative Study. West Afr J Med. 2022.
  98. 98. Oshodi OY, Aina OF, Onajole AT. Substance use among secondary school students in an urban setting in Nigeria: prevalence and associated factors. Afr J Psychiatry (Johannesbg). 2010;13(1):52–7. pmid:20428599
  99. 99. Owonikoko SB, Suleiman JBA, Maibaka WK, Tasiu N. “What a man can do, a woman can do better”: women farmers, livelihood and drug abuse in Adamawa State, northeastern Nigeria. J Ethn Subst Abuse. 2023;22(1):3–28. pmid:33511921
  100. 100. Umar MU, Salihu AS, Owolabi SD. Prevalence and correlates of ADHD in individuals with substance use disorder in Nigeria. Atten Defic Hyperact Disord. 2017;9(3):189–98. pmid:28097536
  101. 101. Onu DU, Ifeagwazi CM, Orjiakor CT, Iorfa SK. Adverse childhood experiences and tramadol use in Nigeria: the mediating role of sociosexuality in a predominantly male student sample. Journal of Substance Use. 2020;26(4):427–33.
  102. 102. Akande-Sholabi W, Adisa R, Ilesanmi OS, Bello AE. Extent of misuse and dependence of codeine-containing products among medical and pharmacy students in a Nigerian University. BMC Public Health. 2019;19(1):1709. pmid:31856775
  103. 103. Parry CDH, Dewing S, Petersen P, Carney T, Needle R, Kroeger K, et al. Rapid assessment of HIV risk behavior in drug using sex workers in three cities in South Africa. AIDS Behav. 2009;13(5):849–59. pmid:18324470
  104. 104. Scheibe AP, Gloeck NR, Shelly S, Marcus TS, Hugo J. The prevalence and characteristics of moderate- to high-risk regulated and unregulated substance use among patients admitted to four public hospitals in Tshwane, South Africa. S Afr Med J. 2019;109(12):971–7. pmid:31865961
  105. 105. Scheibe A, Shelly S, Hugo J, Mohale M, Lalla S, Renkin W, et al. Harm reduction in practice - The Community Oriented Substance Use Programme in Tshwane. Afr J Prim Health Care Fam Med. 2020;12(1):e1–6. pmid:32501031
  106. 106. Vorster A, Gerber AM, van der Merwe LJ, van Zyl S. Second and third year medical students’ self-reported alcohol and substance use, smoking habits and academic performance at a South African medical school. Health SA. 2019;24:1041. pmid:31934400
  107. 107. Schutte CM, Sasikumar S, Nchoe K, Kakaza M, Ueckermann V, Van der Meyden CH. Heroin-induced toxic leukoencephalopathy – “chasing the dragon” in South Africa. DAT. 2017;17(3):195–9.
  108. 108. Van Zyl PM, Gagiano CA, Mollentze WF, Snyman JS, Joubert G. Help-seeking by substance dependants presenting to healthcare professionals in the Free State Province. S Afr J Psych. 2012;18(3):7.
  109. 109. Dannatt L, Cloete KJ, Kidd M, Weich L. Frequency and correlates of comorbid psychiatric illness in patients with heroin use disorder admitted to Stikland Opioid Detoxification Unit, South Africa. S Afr J Psych. 2014;20(3):6.
  110. 110. Ibn Auf A, Alnor MA. Sudanese Medical Students’ Perceptions of Psychoactive Substance Use. Addict Health. 2020;12(3):186–95. pmid:33244395
  111. 111. Osman T, Victor C, Abdulmoneim A, Mohammed H, Abdalla F, Ahmed A, et al. Epidemiology of Substance Use among University Students in Sudan. J Addict. 2016;2016:2476164. pmid:27006856
  112. 112. Hauli KA, Ndetei DM, Jande MB, Kabangila R. The prevalence of substance use among psychiatric patients: the case study of Bugando Medical centre, Mwanza (northern Tanzania). Subst Abus. 2011;32(4):238–41. pmid:22014254
  113. 113. McCurdy S, Kaduri P. The political economy of heroin and crack cocaine in Tanzania. Review of African Political Economy. 2016;43(148).
  114. 114. Ndayongeje J, Msami A, Laurent YI, Mwankemwa S, Makumbuli M, Ngonyani AM, et al. Illicit Drug Users in the Tanzanian Hinterland: Population Size Estimation Through Key Informant-Driven Hot Spot Mapping. AIDS Behav. 2018;22(Suppl 1):4–9. pmid:29435795
  115. 115. Saleem HT, Likindikoki S, Silberg C, Mbwambo J, Latkin C. Time-space constraints to HIV treatment engagement among women who use heroin in Dar es Salaam, Tanzania: A time geography perspective. Soc Sci Med. 2021;268:113379. pmid:32979773
  116. 116. Ubuguyu O, Tran OC, Bruce RD, Masao F, Nyandindi C, Sabuni N, et al. Improvements in health-related quality of life among methadone maintenance clients in Dar es Salaam, Tanzania. Int J Drug Policy. 2016;30:74–81. pmid:27017376
  117. 117. Bio-Sya A, Gandjo HJ, Klikpo ETE, Kouglenou O, Agbanlinsou AC, Damien GB, et al. Nonmedical use of tramadol among secondary school students in Benin, Africa. Am J Drug Alcohol Abuse. 2021;47(6):746–52. pmid:34402343
  118. 118. Van Hout MC, Rich E, Dada S, Bergin M. “Codeine Is My Helper”: Misuse of and Dependence on Codeine-Containing Medicines in South Africa. Qual Health Res. 2017;27(3):341–50. pmid:26582195
  119. 119. Walley AY, Bernson D, Larochelle MR, Green TC, Young L, Land T. The Contribution of Prescribed and Illicit Opioids to Fatal Overdoses in Massachusetts, 2013-2015. Public Health Rep. 2019;134(6):667–74. pmid:31577519
  120. 120. Slavova S, Costich JF, Bunn TL, Luu H, Singleton M, Hargrove SL, et al. Heroin and fentanyl overdoses in Kentucky: Epidemiology and surveillance. Int J Drug Policy. 2017;46:120–9. pmid:28735777
  121. 121. WHO. Analysis Of Drug Markets Opiates, cocaine, cannabis, synthetic drugs. World Drug Report. 2018.
  122. 122. Petersen Z, Myers B, van Hout M-C, Plüddemann A, Parry C. Availability of HIV prevention and treatment services for people who inject drugs: findings from 21 countries. Harm Reduct J. 2013;10:13. pmid:23957896
  123. 123. Charlson FJ, Diminic S, Lund C, Degenhardt L, Whiteford HA. Mental and substance use disorders in Sub-Saharan Africa: predictions of epidemiological changes and mental health workforce requirements for the next 40 years. PLoS One. 2014;9(10):e110208. pmid:25310010
  124. 124. UNODC (United Nations Office on Drugs and Crime). World Drug Report 2018 Analysis of drug markets. World Drug Rep 2018. 2018.
  125. 125. Ruhm CJ. Drug Mortality and Lost Life Years Among U.S. Midlife Adults, 1999-2015. Am J Prev Med. 2018;55(1):11–8. pmid:29801685
  126. 126. Baluku M, Wamala T, Muhangi D. HIV- and hepatitis C-related risk behaviors among people who inject drugs in Uganda: implications for policy and programming. Harm Reduct J. 2019;16(1):56. pmid:31481086
  127. 127. WHO. World Health Organization. Technical brief: HIV and young people who sell sex. Geneva - Google Search. 2015 [cited 13 Jun 2023]. Available from: https://www.google.com/search?q=World+Health+Organization.+Technical+brief%3A+HIV+and+young+people+who+sell+sex.+Geneva&oq=World+Health+Organization.+Technical+brief%3A+HIV+and+young+people+who+sell+sex.+Geneva&aqs=chrome.69i57.2671j0j4&sourceid=chrome&i
  128. 128. Ditmore MH. When sex work and drug use overlap Considerations for advocacy and practice NOVEMBER 2013 Melissa Hope Ditmore Harm Reduction International | Reports The Global State Of Harm Reduction. HARM Reduct Int. 2013 [cited 13 Jun 2023]. Available from: www.ihra.net
  129. 129. Hser Y-I, Longshore D, Anglin MD. The life course perspective on drug use: a conceptual framework for understanding drug use trajectories. Eval Rev. 2007;31(6):515–47. pmid:17986706
  130. 130. Schwartz SJ, Petrova M. Prevention Science in Emerging Adulthood: a Field Coming of Age. Prev Sci. 2019;20(3):305–9. pmid:30637671
  131. 131. Leza L, Siria S, López-Goñi JJ, Fernández-Montalvo J. Adverse childhood experiences (ACEs) and substance use disorder (SUD): A scoping review. Drug Alcohol Depend. 2021;221:108563. pmid:33561668
  132. 132. Boden M, Day E. Illicit drug use in university students in the UK and Ireland: a PRISMA-guided scoping review. Subst Abuse Treat Prev Policy. 2023;18(1):18. pmid:36915093
  133. 133. Cadigan JM, Duckworth JC, Parker ME, Lee CM. Influence of developmental social role transitions on young adult substance use. Curr Opin Psychol. 2019;30:87–91. pmid:31048248
  134. 134. Hammond CJ, Mayes LC, Potenza MN. Neurobiology of adolescent substance use and addictive behaviors: Treatment implications. Adolesc Med State Art Rev. 2014.
  135. 135. Namisango E, Allsop MJ, Powell RA, Friedrichsdorf SJ, Luyirika EBK, Kiyange F, et al. Investigation of the Practices, Legislation, Supply Chain, and Regulation of Opioids for Clinical Pain Management in Southern Africa: A Multi-sectoral, Cross-National, Mixed Methods Study. J Pain Symptom Manage. 2018;55(3):851–63. pmid:29155288
  136. 136. Huang KTL, Owino C, Gramelspacher GP, Monahan PO, Tabbey R, Hagembe M, et al. Prevalence and correlates of pain and pain treatment in a western Kenya referral hospital. J Palliat Med. 2013;16(10):1260–7. pmid:24032753
  137. 137. WHO. People with medical needs are “left behind in pain” reveals new report. 2023 [cited 1 Feb 2024]. Available from: https://www.who.int/news/item/16-06-2023-people-with-medical-needs-are--left-behind-in-pain--reveals-new-report
  138. 138. Knaul FM, Farmer PE, Krakauer EL, De Lima L, Bhadelia A, Jiang Kwete X, et al. Alleviating the access abyss in palliative care and pain relief-an imperative of universal health coverage: the Lancet Commission report. Lancet. 2018;391(10128):1391–454. pmid:29032993
  139. 139. Bhadelia A, De Lima L, Arreola-Ornelas H, Kwete XJ, Rodriguez NM, Knaul FM. Solving the Global Crisis in Access to Pain Relief: Lessons From Country Actions. Am J Public Health. 2019;109(1):58–60. pmid:30495996