What the evidence shows about early response
Cochrane reviews of antidepressant efficacy describe a subset of patients showing measurable mood improvement within the first two weeks. Long-term data suggest early response is generally associated with sustained response, not with later collapse. The Royal College of Psychiatrists describes early improvement as a positive prognostic sign in most cases.
Why some patients respond early
Individual variation in response time is well-documented. Some patients metabolise antidepressants differently, some have a more responsive neurochemistry, and some may experience an additional placebo-like effect from the act of starting treatment. None of these undermines the validity of the improvement. Early response that lasts is response.
What to do if you feel better early
Continue the medication as prescribed — do not reduce or stop because you feel better. Keep your daily record and notice whether the improvement holds across weeks. Tell your prescriber at the next appointment — early response is useful information for treatment planning.
Do not assume early response means you can stop early. Major guidelines still recommend continued treatment for six to twelve months after remission, regardless of how quickly improvement appeared.
What to flag to your prescriber
- Improvement that collapses suddenly after an initial lift.
- Unusual elevation of mood alongside the improvement (mania symptoms).
- Significant agitation or sleep loss combined with early improvement.
- A sense that the early response was driven by a brief situational factor rather than genuine change.
Frequently asked questions
Is feeling better in week one a placebo effect?
It might be partly placebo and partly real medication response — they are not mutually exclusive. Improvement that lasts past the first weeks is genuine improvement.
Should I stop the medication if I feel better quickly?
No. Major guidelines recommend continued treatment for at least six to twelve months after remission, regardless of how quickly the response appeared. Always discuss any changes with your prescriber.
Could the early improvement disappear?
Sometimes brief improvements collapse, but early sustained response is generally a positive prognostic sign. Keep your daily record to see what holds across weeks — that data will also be useful at your next appointment.
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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