Does the Sinclair Method Work?

The Short Answer

For many people, yes. The Sinclair Method has a substantial evidence base, including multiple randomized controlled trials, long-term follow-up studies, and decades of clinical use in Finland, where it is a standard treatment. However, it does not work for everyone, and results vary.

What the Research Shows

The most commonly cited figure is that approximately 78% of people who use TSM consistently experience significant reduction in drinking. This figure comes from Dr. Sinclair's research and has been supported by subsequent studies. However, it is important to understand what "significant reduction" means — it includes both controlled drinking and abstinence, and results vary widely.

The COMBINE study (2006), one of the largest alcohol treatment trials ever conducted, found that naltrexone significantly reduced drinking compared to placebo. Multiple meta-analyses have confirmed naltrexone's effectiveness for alcohol use disorder.

Why TSM May Not Work for Everyone

• Inconsistent use: TSM requires taking naltrexone before every drinking occasion. Inconsistent use significantly reduces effectiveness.
• Opioid receptor genetics: Some people have genetic variations (OPRM1 gene) that affect how they respond to naltrexone. Research suggests that people with the A118G variant may respond better.
• Medical contraindications: Naltrexone is not appropriate for everyone. People with liver disease, those using opioids, and others may not be candidates.
• Motivation and support: Like any treatment, TSM works best with appropriate support and motivation.

What "Success" Means in TSM

TSM does not define success as abstinence only. Controlled drinking, reduced consumption, and improved quality of life are all considered successful outcomes. This is a meaningful difference from abstinence-only approaches.