Topamax hair loss: label rates, timing and recurrence

Also searched as: topamax hair losstopiramate hair losstopiramate migraine hair loss

In the Topamax epilepsy monotherapy trial, alopecia was reported in 3% of adults on 50 mg/day and 4% on 400 mg/day; a medical-records study found it in 1.7% of 230 users, and case reports describe onset 2–3 months after starting.

No consistent week-by-week window is published for this, so it is not on the calculator.

The timeline

Stage	When (typically)	What's happening
Onset (case reports)	About 2–3 months after starting	Reported cases began after two months of adjunctive therapy and after three months at 50 mg/day for migraine. [Medicines]

Topiramate among seizure and migraine medicines

Medicine	Reported hair loss
Topiramate	3–4% of adults in the monotherapy trial [U.S.]; 1.7% of 230 users [Medicines]
Valproate	12–28%, dose-dependent [DermNet]
Carbamazepine	0.3%–6% [Medicines]
Levetiracetam	0.4% of 1,903 patients [Medicines]

Key facts

In two case reports, hair loss recurred when topiramate was restarted, which points to the drug rather than chance. [Medicines]

Normal vs. warning signs

Commonly normal

Diffuse shedding without patches

Warning signs — get checked

Patches or smooth bald spots
Scalp pain, redness, burning or scaling
Loss of eyebrows, eyelashes or body hair
Sudden vision changes or eye pain — seek urgent care

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What may help

Never stop or change a prescribed medicine on your own — raise hair changes with your prescriber, who can weigh them against why you take it. Seizure medicines in particular should never be stopped suddenly.
Log dose changes against when shedding started.

Related triggers

Medications

Valproate (Depakote)

Frequently asked questions

How common is Topamax hair loss?

The label's epilepsy trial reported 3% of adults on 50 mg/day and 4% on 400 mg/day; a records study found 1.7%.

When does topiramate hair loss start?

Published case reports describe onset about 2–3 months after starting.

Will my hair grow back?

In case reports hair regrew after dose reduction or stopping under medical supervision.

Sources

U.S. FDA. TOPAMAX (topiramate) prescribing information
Medicines (Basel), 2023. Antiseizure Medication-Induced Alopecia: A Literature Review
DermNet. Alopecia from drugs