Antiepileptic (sulfamate-substituted monosaccharide)
Topiramate with the birth control pill
Many women of reproductive age take a combined or progestogen-only oral contraceptive while also using a chronic medication such as Topiramate (Topiramate). The combination is generally fine at 25mg, 50mg, 100mg, 200mg, but a small number of medications can reduce contraceptive efficacy meaningfully and need either a backup method or a switch.
How Topiramate can affect contraceptive efficacy
Combined and progestogen-only contraceptives are metabolised through CYP3A4. Strong CYP3A4 inducers (some antiepileptics, rifampicin, St John's Wort) lower contraceptive plasma levels and reduce efficacy. Whether Topiramate acts on CYP3A4 determines whether Topiramate affects contraception. Most agents in Antiepileptic (sulfamate-substituted monosaccharide) have no clinically meaningful effect on the pill at 25mg, 50mg, 100mg, 200mg.
Practical guidance
According to the prescribing information for Topiramate, women on hormonal contraception should review Topiramate with the prescribing pharmacist or doctor. Where an interaction is documented, additional barrier contraception or switching to a non-oral method (IUD, implant) for the duration of Topiramate therapy is the standard mitigation.
Frequently asked questions
Will Topiramate make my pill less effective? ▾
Most Antiepileptic (sulfamate-substituted monosaccharide) medications at 25mg, 50mg, 100mg, 200mg do not affect oral contraceptive efficacy. The exceptions are CYP3A4-inducing drugs and a small number of others. The prescribing information for Topiramate states whether the interaction is meaningful.
Do I need a backup contraceptive on Topiramate? ▾
Backup contraception is needed only when there is a documented interaction between Topiramate and the contraceptive method. For most users at 25mg, 50mg, 100mg, 200mg, no backup is required. The pharmacist confirms whether Topiramate interacts with hormonal contraception.
Products containing Topiramate
More on Topiramate
- With alcoholTopiramate and alcohol — is it safe to drink?
- With foodShould Topiramate be taken with food?
- Side effectsTopiramate side effects: common, rare and warning signs
- Dosage guideTopiramate dosage guide: how much to take and when
- OnsetHow fast does Topiramate start working?
- DurationHow long does Topiramate last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.