Provera 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 Provera (Medroxyprogesterone Acetate). The combination is generally fine at 2.5mg, 5mg, 10mg, but a small number of medications can reduce contraceptive efficacy meaningfully and need either a backup method or a switch.
How Provera 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 Medroxyprogesterone acts on CYP3A4 determines whether Provera affects contraception. Most agents in Women's Sexual Health have no clinically meaningful effect on the pill at 2.5mg, 5mg, 10mg.
Practical guidance
According to the prescribing information for Medroxyprogesterone, women on hormonal contraception should review Provera 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 Provera therapy is the standard mitigation.
Frequently asked questions
Will Provera make my pill less effective? ▾
Most Women's Sexual Health medications at 2.5mg, 5mg, 10mg do not affect oral contraceptive efficacy. The exceptions are CYP3A4-inducing drugs and a small number of others. The prescribing information for Medroxyprogesterone states whether the interaction is meaningful.
Do I need a backup contraceptive on Provera? ▾
Backup contraception is needed only when there is a documented interaction between Provera and the contraceptive method. For most users at 2.5mg, 5mg, 10mg, no backup is required. The pharmacist confirms whether Medroxyprogesterone interacts with hormonal contraception.
More on Provera
- With alcoholProvera and alcohol — is it safe to drink?
- With foodShould Provera be taken with food?
- Side effectsProvera side effects: common, rare and warning signs
- Dosage guideProvera dosage guide: how much to take and when
- OnsetHow fast does Provera start working?
- DurationHow long does Provera last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.