Topiramate (Topamax) is an anticonvulsant medication sometimes prescribed off-label to support weight loss. It can be a genuinely useful tool for the right patient — but it comes with real side effects and a pregnancy warning worth understanding before you start.
Topiramate was originally developed to treat seizures and is also FDA-approved for migraine prevention. Along the way, prescribers noticed a consistent side effect: weight loss. It appears to work through a few overlapping mechanisms — altering taste perception (many patients say carbonated drinks taste flat or unpleasant), increasing feelings of fullness, and generally reducing appetite.
Topamax is also one half of Qsymia, an FDA-approved combination medication that pairs a low dose of topiramate with phentermine. Used on its own, off-label, it's typically started at a low dose and titrated slowly to minimize side effects.
Short clips covering how Topamax works, common side effects, and what to know before starting. Recorded by our founder, Dr. Abbott; today, care is provided by McKell Johnson, FNP-BC.
Topamax carries an FDA warning for an increased risk of oral clefts (cleft lip and/or cleft palate) in babies exposed during the first trimester of pregnancy. This is one of the most important things we screen for before prescribing it. If you are pregnant, planning a pregnancy, or could become pregnant, we need to know before starting Topamax — reliable contraception is required throughout treatment. This isn't a reason to rule the medication out entirely, but it is a conversation we have with every patient before writing a prescription.
A stimulant-based appetite suppressant that works through a different mechanism than Topamax — sometimes used together at low doses.
Learn About PhentermineGLP-1 medications remain our first-line option for most patients — see the dedicated Tirzepatide guide or the full program and how it compares.
Explore Medical Weight LossTopamax isn't our first-line weight loss medication, but for the right patient — especially someone who hasn't tolerated GLP-1s well, or who needs an additional tool — it can make a real difference. The key is starting low, going slow, and being upfront about the pregnancy warning from day one.
Reviewed for accuracy by McKell Johnson, FNP-BC, Clinical Director, and the Abbott Health & Wellness care team.
Often discussed alongside Topamax: Phentermine, Semaglutide & Tirzepatide, weight gain, and functional medicine.
What patients ask most before their first appointment.
Book a consultation and we'll review your health history to see whether Topamax, Phentermine, a GLP-1 medication, or some combination makes the most sense.