Evidence of use and users of image- and performance-enhancing drugs in sports in Switzerland: a scoping literature review and implications for Swiss drug policy

Abstract

BACKGROUND: “Image- and performance-enhancing drugs” are widely used in sports worldwide to improve body image and performance goals. In view of the growing research interest and use of these substances, and the paucity of data on the situation in Switzerland, we conducted a scoping literature review on evidence of the use and users of these substances in Switzerland. METHODS: A scoping review was conducted following the Preferred Reporting Items for Systematic reviews and Meta-Analyses extension for Scoping Reviews (PRISMA-ScR) statement. We searched PubMed/Medline, Embase and Google Scholar for articles published before August 2022. Primary outcomes were evidence of the use and users of image- and performance enhancing drugs in Switzerland. We used a narrative synthesis approach for data analysis. RESULTS: Overall, 18 studies were reviewed, which in total comprised 11,401 survey participants, 140 interviews and 1368 toxicologically analysed substances. Articles were mostly peer-reviewed (83%) and mostly included evidence from professional athletes (43%). The mean publication year was 2011. In most articles both outcomes (78%) were evaluated simultaneously. We demonstrate that image- and performance-enhancing drugs appear to be prevalent among athletes and non-athletes in Switzerland. A wide variety of substances exist, and the type of substances used varied by age, motivation, sex and sports discipline. The main motivations for using these substances were, among others, image- and performance enhancement. The main route of acquisition of these substances was the Internet. Furthermore, we demonstrated that substantial proportions of these substances, as well as supplements, may be counterfeit. Information on image- and performance-enhancing drug use was acquired from different sources. CONCLUSIONS: Although evidence of image- and performance-enhancing drug use and its users in Switzerland is scarce and there are major gaps, we demonstrate that these substances are also prevalent among athletes and non-athletes in Switzerland. Furthermore, high proportions of substances acquired from unregulated drug markets are counterfeit, which puts users in a situation of unpredictable risk when consuming them. Overall, the use of these substances may pose a substantial risk to individual and public health in this possibly growing and often insufficiently informed and medically neglected user community in Switzerland. There is a great need for future research, as well as prevention, harm-reduction and treatment programmes for this hard-to-reach user community. Doping policies in Switzerland should be critically reviewed as simple medical care and evidence-based treatment for non-athlete image- and performance-enhancing drug users is excessively criminalized under the current legislature, leaving possibly over 200,000 image- and performance-enhancing drug users in Switzerland with inadequate medical care.