What plateau typically looks like
Most patients describe meaningful improvement in the first six to eight weeks, followed by a sense that further improvement has stopped. The remaining symptoms may be mild but persistent, or moderate enough to affect quality of life. The plateau is distinct from relapse (return of full symptoms) and from tachyphylaxis (effectiveness fading over years).
Why plateaus happen
Several explanations are discussed in the literature. The dose may be sub-optimal — partial response sometimes resolves with a dose increase. The medication may not fully suit this individual — different antidepressants suit different patients. Other factors (sleep, stress, alcohol) may be limiting further response. The Maudsley Prescribing Guidelines describe partial response as a common reason for treatment review.
What the evidence supports as next steps
Dose optimisation is typically the first step — many partial responders improve with an upward dose adjustment within the medication's approved range. Switching to a different antidepressant is the next common option. Augmentation with a second medication is more specialist territory, sometimes involving a psychiatrist. Adding therapy is documented to improve outcomes for partial responders in NICE guidance.
If you are unsure how to raise a plateau at your next appointment, preparing in advance helps. A written summary of your symptoms over recent weeks gives your prescriber a clearer picture and makes the conversation more productive.
What to flag to your prescriber
- Improvement has stalled for several weeks with persistent symptoms.
- Daily function is still affected by remaining symptoms.
- New or worsening side effects since your last review.
- Concern about whether the medication is still right for you.
Frequently asked questions
Is it normal for an antidepressant to stop improving?
Plateaus below full response are documented as common. They are a recognised reason for treatment review, not a sign of failure.
What can I do if my antidepressant has plateaued?
Discuss with your prescriber. Dose adjustment, medication change, augmentation, or added therapy are all standard options documented in clinical guidelines.
How long should I wait before assuming it has plateaued?
Most clinical guidance suggests assessing response at eight to twelve weeks. Persistent plateau beyond this is the point for review. Keeping a short daily record across this window gives you concrete observations to bring to that conversation.
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.
Related reading
Keep a calmer record of the first 90 days
If you want a calmer way to keep a short daily record across the first 90 days, Causiq is being built for exactly that.
Join the waitlist