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This paper, the first in a series related to the Joint European South African Research Network in Anxiety Disorders programme, examines substance use trends in South Africa. Alcohol remains the substance with the greatest burden of harm. Yet, trends vary by region, with for example methamphetamine being a major driver of psychiatric and substance abuse treatment demand in the Western Cape province. Heroin use is increasing in several provinces, where rapid intervention is required to avoid an epidemic. In particular, the state (the main funder of drug services) urgently needs to provide opioid substitution treatment. Apart from an inadequate number of treatment services, barriers to treatment are high. Barriers are predominantly cost, transport and resource related. Services are also impacted by a small and inadequately trained workforce and poor integration with mental health services. To adequately …