Topiramate
Metabolic Health · Anticonvulsant
Also known as: Topamax
Tier B-
Bottom line
Read Off Label grades Topiramate as B- (5.8/10) based on strong evidence, med benefit magnitude, and a med-high-risk safety profile.
Qsymia (phentermine + topiramate ER) is FDA-approved and shows ~10% weight loss.
Typical use: 25-100 mg PO daily (monotherapy off-label); 23-92 mg + phentermine 3. — Rx.
What this is
Qsymia (phentermine + topiramate ER) is FDA-approved and shows ~10% weight loss. Topiramate alone has off-label use. Strong teratogen — pregnancy avoidance required.
Mechanism
GABA potentiation; AMPA/kainate glutamate antagonism; carbonic anhydrase inhibition; appetite suppression mechanism unclear; dysgeusia may play a role
Dose & route
25-100 mg PO daily (monotherapy off-label); 23-92 mg + phentermine 3.75-15 mg in Qsymia
Citations
- https://pubmed.ncbi.nlm.nih.gov/22632912/
- https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(11)60205-5/fulltext
- https://pubmed.ncbi.nlm.nih.gov/14678203/
- https://doi.org/10.6004/jadpro.2026.17.3.3
- https://pubmed.ncbi.nlm.nih.gov/40809604/
- https://doi.org/10.1101/2025.05.07.652668
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Common questions
- Does Topiramate work?
- Read Off Label rates the evidence for Topiramate as Strong and the benefit magnitude as med, producing an overall grade of B- (5.8/10). Qsymia (phentermine + topiramate ER) is FDA-approved and shows ~10% weight loss.
- Is Topiramate safe?
- Topiramate has a med-high risk profile in published human data. Legal status: Rx. This is not medical advice — see the disclaimer.
- What is the typical dose for Topiramate?
- 25-100 mg PO daily (monotherapy off-label); 23-92 mg + phentermine 3.75-15 mg in Qsymia
- How does Topiramate work?
- GABA potentiation; AMPA/kainate glutamate antagonism; carbonic anhydrase inhibition; appetite suppression mechanism unclear; dysgeusia may play a role
This is an independent synthesis of published research by a non-clinician. Scores are opinions supported by citations, not prescriptions. See the full disclaimer and methodology for how this score was produced and what it does and doesn't mean.