Topamax with antibiotics: interactions and safety
Antibiotic courses are common, short-term and often combined with chronic medications such as Topamax (Topiramate). Most antibiotics do not interfere meaningfully with Topiramate at 25mg, 50mg, 100mg, 200mg, but a few classes do, and a small number of combinations are best avoided.
Common antibiotic interactions
Macrolides (clarithromycin, erythromycin) and certain antifungals can inhibit hepatic metabolism (CYP3A4) and raise plasma levels of many medications including some Neurological Medications agents. Rifampicin has the opposite effect, accelerating metabolism. Most penicillins, cephalosporins, fluoroquinolones and tetracyclines have no clinically meaningful interaction with Topiramate at 25mg, 50mg, 100mg, 200mg.
Practical guidance
According to the prescribing information for Topiramate, an antibiotic course should be reviewed by the prescriber or pharmacist for known interactions before Topamax is co-administered. Adjusted 25mg, 50mg, 100mg, 200mg dosing or temporary substitution is sometimes preferred for the duration of the antibiotic course.
Frequently asked questions
Can I take Topamax during an antibiotic course? ▾
For most common antibiotics, yes. A few classes — notably macrolides and azole antifungals — alter how Topiramate is metabolised and may need a temporary 25mg, 50mg, 100mg, 200mg adjustment. The prescribing pharmacist should review any new antibiotic against the existing Topamax regimen.
Will antibiotics make Topamax stop working? ▾
Most antibiotics do not affect Topamax efficacy. Rifampicin and a few others can lower Topiramate levels and reduce effect; in those cases the prescriber may adjust the dose during and shortly after the antibiotic course.
More on Topamax
- With alcoholTopamax and alcohol — is it safe to drink?
- With foodShould Topamax be taken with food?
- Side effectsTopamax side effects: common, rare and warning signs
- Dosage guideTopamax dosage guide: how much to take and when
- OnsetHow fast does Topamax start working?
- DurationHow long does Topamax last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.