BackgroundThis research article retrospectively analyses the agenda-setting approach of policies concerning high-risk sexual behaviours, stimulant and alcohol abuse among Iranian adolescents.MethodsThis qualitative case study policy analysis involved analysing 51 national documents and conducting interviews with 49 policy-makers and executives. Purposive sampling with a snowball strategy and semi-structured interviews were used. The data was analysed using the framework analysis method, with Kingdon’s multiple streams framework serving as the analytical framework.ResultsThe study has identified the confluence of several factors, including the problem stream, the policy stream and the political stream. Within the problem stream, several factors contributed, such as the prevalence of high-risk behaviours, strong scientific evidence on these behaviours, changes in human immunodeficiency virus (HIV) transmission patterns, increased statistics of poisoning and deaths related to alcohol abuse, and the visit of Iran’s supreme leader to the slums of Mashhad city. The policy stream has two periods of denial and acceptance. The denial period includes considering these high-risk behaviours to be the consequences of western culture, emphasis on the religious aspects and sinfulness of these behaviours, resisting the prevalence of anomalous behavioural patterns, abstinence and religious obligation of chastity, and avoiding ethical corruption. The acceptance period includes adolescents training, fear messages, promotional and cultural activities, parent training, school staff training, providing psychiatric services for withdrawal, counselling and reference to receive specialized services. The political stream involves global attention towards non-communicable diseases and high-risk behaviours, and the significant impact of preventing these behaviours during adolescence on the health status of society. Also, the supreme leader’s attention to social harms, and the establishment of the National Committee for Prevention and Control of Alcohol, have played significant roles.ConclusionsWhile the problem stream helped to highlight the problem and increase policy-makers’ attention, the politics stream played a significant role. Despite international evidence on the effectiveness of training in sexual issues in reducing high-risk behaviours, it did not succeed in being added to the agenda. The policy stream was heavily influenced by ideology and the political parties in power, affecting evidence-based policy-making. In countries with an ideological approach, the political stream plays a vital role in setting problems on the agenda.