Gabapentinoid (alpha-2-delta ligand)
Gabapentin 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 Gabapentin (Gabapentin). The combination is generally fine at 100mg, 300mg, 400mg, 600mg, 800mg, but a small number of medications can reduce contraceptive efficacy meaningfully and need either a backup method or a switch.
How Gabapentin 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 Gabapentin acts on CYP3A4 determines whether Gabapentin affects contraception. Most agents in Gabapentinoid (alpha-2-delta ligand) have no clinically meaningful effect on the pill at 100mg, 300mg, 400mg, 600mg, 800mg.
Practical guidance
According to the prescribing information for Gabapentin, women on hormonal contraception should review Gabapentin 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 Gabapentin therapy is the standard mitigation.
Frequently asked questions
Will Gabapentin make my pill less effective? ▾
Most Gabapentinoid (alpha-2-delta ligand) medications at 100mg, 300mg, 400mg, 600mg, 800mg do not affect oral contraceptive efficacy. The exceptions are CYP3A4-inducing drugs and a small number of others. The prescribing information for Gabapentin states whether the interaction is meaningful.
Do I need a backup contraceptive on Gabapentin? ▾
Backup contraception is needed only when there is a documented interaction between Gabapentin and the contraceptive method. For most users at 100mg, 300mg, 400mg, 600mg, 800mg, no backup is required. The pharmacist confirms whether Gabapentin interacts with hormonal contraception.
Products containing Gabapentin
More on Gabapentin
- With alcoholGabapentin and alcohol — is it safe to drink?
- With foodShould Gabapentin be taken with food?
- Side effectsGabapentin side effects: common, rare and warning signs
- Dosage guideGabapentin dosage guide: how much to take and when
- OnsetHow fast does Gabapentin start working?
- DurationHow long does Gabapentin last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.