TREATMENT RESEARCH

Treatment adherence research

Published 2026-05-18 · Last reviewed 2026-09-23 by Shariq Refai, MD, MBA, FAPA · 1 min read

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Educational. This page explains how to read and weigh research. It makes no claim about any treatment. How we source and review

Research question

How well do people stay on anxiety treatment, and what does the research say about why adherence matters?

What the evidence suggests

Adherence to anxiety treatment, both medication and therapy, is incomplete in real-world settings. A meaningful share of patients stop antidepressants within the first few months, often before the medication has had a full chance to work. Therapy has dropout as well, since CBT requires attending sessions and doing practice between them.

The research identifies several recurring reasons. Side effects are a major driver of stopping medication, particularly sexual side effects with SSRIs. The slow onset of antidepressants matters too. A person who expects fast relief and feels none in the first two weeks may stop before the four-to-six-week window in which benefit usually appears. Cost, insurance gaps, the burden of appointments, stigma, and simply feeling better and deciding the treatment is no longer needed all contribute.

Adherence is also why real-world results often fall short of trial results. A treatment can have strong efficacy in a trial and a weaker effect in practice, not because the treatment changed, but because fewer people took it as intended.

Important limitations

Adherence research depends on imperfect measurement. Self-report and pharmacy records each have limits, and the two often disagree. Most adherence studies are observational rather than randomized.

Practical interpretation

Adherence is a central reason treatments underperform outside of trials. Understanding the common reasons people stop, especially the slow onset of antidepressants and the burden of side effects, helps set realistic expectations. Measurement-based care and clear communication about what to expect can support adherence. Decisions about continuing or changing treatment belong with a clinician.

What the evidence doesn't prove

The research doesn't show a single intervention that solves adherence. It doesn't establish that non-adherence is mainly a patient failing. The causes are often structural, including cost and access.

Sources

World Health Organization. Adherence to Long-Term Therapies: Evidence for Action. 2003
https://iris.who.int/handle/10665/42682
Date accessed: 2026-05-18
Sansone RA, Sansone LA. Antidepressant adherence: are patients taking their medications? Innovations in Clinical Neuroscience, 2012. PMID: 22808448
https://pubmed.ncbi.nlm.nih.gov/22808448/
Date accessed: 2026-05-18

How to cite this page

Short

AnxietyResearch.org (2026). Treatment adherence research. Medically reviewed by Shariq Refai, MD, MBA. https://anxietyresearch.org/treatment-research/treatment-adherence-research/

APA

Refai, S. (2026, May 18). Treatment adherence research. AnxietyResearch.org. https://anxietyresearch.org/treatment-research/treatment-adherence-research/

MLA

Refai, Shariq. "Treatment adherence research." AnxietyResearch.org, 18 May 2026, https://anxietyresearch.org/treatment-research/treatment-adherence-research/.

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