Three Months In on an Antidepressant: What Comes Next

The three-month mark is a meaningful milestone on an antidepressant. By this point, NICE and RANZCP guidance describe most patients as having a clearer sense of whether the medication is working, the dose is right, and the side effects are manageable. It is the natural point to have a longer conversation with your prescriber about the next phase of treatment.

What is typical at three months

For patients who responded to the medication, three months in is often when the improvement feels more established — not transient, not a fluke. Side effects have typically settled to a manageable level. Sleep, appetite, and energy have often returned closer to baseline. The relationship with the medication has stabilised.

What to discuss with your prescriber

NICE NG222 recommends continuing antidepressant treatment for at least six to twelve months after symptom remission to reduce relapse risk. At three months, the conversation typically covers: how well the medication is working, whether the dose is right, whether side effects are acceptable long-term, and the planned duration of treatment. Bring a written summary of the three months if possible.

What comes next

Maintenance. For most patients, the next phase is continuing the same medication and dose for several months while monitoring progress.

Dose adjustment. Some patients have a dose adjustment at three months to optimise the therapeutic effect.

Switching medications. A smaller group may switch to a different medication if the current one has been insufficient.

Less frequent appointments. The rhythm of follow-up appointments typically becomes less frequent — often every three months once treatment is stable.

What to flag to your prescriber

Raise these at your three-month review or sooner

Side effects that have not improved or are affecting quality of life.
Return of original symptoms despite continued treatment.
New side effects appearing late in treatment.
Questions about how long to continue the medication.

Frequently asked questions

How long should I stay on the antidepressant after I feel better?

NICE NG222 recommends at least six to twelve months of continued treatment after symptom remission. Speak to your prescriber about the right plan for you — the duration depends on your history and circumstances.

Is three months long enough to know if the medication is working?

Yes — by three months most patients have a clear sense. If improvement is partial, dose adjustment or other changes are often considered at this point rather than waiting further.

How often should I see my prescriber after three months?

Typically less often than in the first three months. Three-monthly reviews are common once treatment is stable, though your prescriber will advise what suits your situation.

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.