How long does sertraline take to work?
Last updated September 3, 2026.
Weeks, not days: early signs (sleep, appetite, energy) may stir within 1 to 2 weeks, but the full effect typically takes 4 to 6 weeks - longer at low starting doses. Expect the cruel part: side effects (nausea, headache, sleep changes, a brief anxiety bump) often arrive before benefits, and most ease after a couple of weeks. So the first fortnight can feel like all cost, no reward. Take it daily at the same time; do not judge it before 4 to 6 weeks at an adequate dose; never stop suddenly because it seems quiet - a fair-trial failure gets adjusted or switched, not abandoned. Worsening mood or thoughts of self-harm early on mean call your doctor the same day. In crisis: call or text 988 in the US, or your local crisis line. Pymander is a free AI doctor, 24/7 by text, and can help you through the first weeks.
What to do
- Track weekly, not daily: the trend is the signal.
- Same time every day: morning or evening, your pick - then fixed.
- Give the trial 4 to 6 weeks: then adjust, switch, or stay - with your doctor.
- Same-day call for worsening mood or self-harm thoughts: especially early on. 988 in the US.
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