What the evidence shows
NICE NG222 recommends structured physical activity as part of depression treatment. Multiple Cochrane reviews find exercise has meaningful antidepressant effects, and combined with medication it typically outperforms medication alone in reducing symptoms and preventing relapse. Aerobic exercise (walking, running, cycling, swimming) has the strongest evidence, though strength training also shows benefit.
Practical considerations in the first weeks
In the first one to two weeks of a new antidepressant, fatigue and dizziness may make exercise harder than usual. Start gentle — walks rather than intense sessions. Hydrate well; some antidepressants increase sweating. Watch for postural dizziness (standing up quickly after floor exercises can be worse in the first weeks). By week three or four, most patients can return to their normal activity level.
What tends to work
Consistency beats intensity. Thirty minutes of moderate activity most days is generally more useful than occasional intense sessions. Exercise that involves being outdoors adds sunlight exposure. Group exercise adds social connection. Timing exercise for early or mid-day rather than late evening protects sleep. All of these amplify the antidepressant effect of exercise itself.
What to flag to your prescriber
Raise these at any review
- Chest pain, breathlessness, or dizziness during exercise.
- Racing heart that does not settle with rest.
- Marked drop in blood pressure on standing (may indicate need for dose review).
- Fatigue that prevents any exercise at all after the first month.
Frequently asked questions
Is it safe to exercise on antidepressants?
Yes. Regular exercise is actively recommended in major depression treatment guidelines alongside medication.
Will exercise interfere with my antidepressant?
No — it typically enhances the effect. Combined with medication, exercise generally improves outcomes over medication alone.
How much exercise should I do?
Around 30 minutes of moderate activity most days is a common target in major guidelines. Consistency matters more than intensity.
Evidence and sources referenced
- NICE Guideline NG222 — Depression in adults: treatment and management (United Kingdom).
- Royal Australian and New Zealand College of Psychiatrists (RANZCP) — Clinical Practice Guidelines for Mood Disorders.
- NPS MedicineWise — prescriber and patient resources on antidepressant treatment (Australia).
- Royal College of Psychiatrists — patient information on antidepressants.
- TGA and FDA — product information for SSRI and SNRI medication classes.
- Maudsley Prescribing Guidelines in Psychiatry — prescribing patterns and side-effect timelines.
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