Psychiatric Medication: An Evidence-Based Guide for Patients

Why This Matters

Psychiatric medications are among the most prescribed drugs globally, yet understanding of how they work - and realistic expectations of what they can and cannot do - is remarkably low. Both excessive fear ("medication changes who you are") and excessive faith ("medication will fix everything") distort decision-making. The evidence supports a pragmatic middle ground.

Antidepressants: The Evidence

A 2018 network meta-analysis in The Lancet covering 522 trials and 116,477 participants confirmed that all 21 antidepressants studied were more effective than placebo for acute depression. Effect sizes ranged from modest (NNT of 5-9 for clinically significant response) to meaningful. SSRIs and SNRIs are first-line due to their tolerability profile, not necessarily their efficacy relative to older agents.

The controversy about antidepressant efficacy largely reflects: publication bias inflating effect sizes, the fact that average effects include both strong responders and non-responders, and legitimate questions about long-term use in mild-moderate depression.

"Antidepressants work - but they work better for more severe depression, and the modest average effects in mild cases should inform the decision to use them." - Joanna Moncrieff, University College London

Key Classes and Their Uses

Psychiatric Medication in Practice

Questions to discuss with your prescriber: What is the realistic expected effect size? How long before we know if it is working? What is the plan for discontinuation? What other treatments should accompany medication? The evidence consistently shows combined medication and psychotherapy outperforms either alone for most conditions. Medication is rarely the complete answer - but for moderate-to-severe conditions, it is often an important part of one.