Side by side: discontinuation vs relapse
Discontinuation syndrome
- Appears within days of stopping or reducing
- Peaks in the first one to two weeks
- Resolves within four to six weeks
- Includes physical sensations: brain zaps, dizziness, flu-like feelings, nausea, tingling
- Emotional volatility without the full pattern of depression
- Feels unwell in ways unrelated to mood
Relapse
- Appears more gradually, over weeks to months
- Mirrors the original condition — low mood, anhedonia, hopelessness
- No novel physical sensations like brain zaps
- Follows the pattern of the previous episode
- Does not resolve on its own
- Requires prescriber review and likely treatment
The practical distinguishing test
Timing: discontinuation appears in days, relapse in weeks. Physical features: brain zaps, dizziness, and flu-like feelings strongly suggest discontinuation, not relapse — these are not typical depression symptoms. Resolution: discontinuation resolves within four to six weeks without treatment; relapse does not resolve on its own. If symptoms appear within days of stopping and feel physical, they are more likely discontinuation. If they appear weeks after stopping and mirror your original depression or anxiety, consider discussing a return to treatment with your prescriber.
What to flag to your prescriber
Contact your prescriber if you notice
- Symptoms resembling your original depression or anxiety pattern.
- New suicidal thoughts after stopping.
- Persistent symptoms beyond six weeks of stopping.
- Severe physical symptoms that are not easing.
Frequently asked questions
How do I know if it's discontinuation or relapse?
Timing and type. Discontinuation appears within days with physical features — brain zaps, dizziness, flu-like feelings. Relapse appears over weeks and mirrors your original condition. If you are unsure, contact your prescriber — they can help distinguish the two.
Should I restart the medication if I feel bad after stopping?
Talk to your prescriber. They can help distinguish discontinuation from relapse and decide the right next step. Do not restart without guidance — the answer depends on which pattern you are experiencing.
How long does discontinuation syndrome last?
Typically resolves within four to six weeks. Persistence beyond this is uncommon and warrants prescriber review, as it may indicate the symptoms are something other than straightforward discontinuation.
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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