Mounjaro 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 Mounjaro (Tirzepatide). The combination is generally fine at 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg, 15mg, but a small number of medications can reduce contraceptive efficacy meaningfully and need either a backup method or a switch.
How Mounjaro 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 Tirzepatide acts on CYP3A4 determines whether Mounjaro affects contraception. Most agents in Diabetes Treatment have no clinically meaningful effect on the pill at 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg, 15mg.
Practical guidance
According to the prescribing information for Tirzepatide, women on hormonal contraception should review Mounjaro 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 Mounjaro therapy is the standard mitigation.
Frequently asked questions
Will Mounjaro make my pill less effective? ▾
Most Diabetes Treatment medications at 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg, 15mg do not affect oral contraceptive efficacy. The exceptions are CYP3A4-inducing drugs and a small number of others. The prescribing information for Tirzepatide states whether the interaction is meaningful.
Do I need a backup contraceptive on Mounjaro? ▾
Backup contraception is needed only when there is a documented interaction between Mounjaro and the contraceptive method. For most users at 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg, 15mg, no backup is required. The pharmacist confirms whether Tirzepatide interacts with hormonal contraception.
More on Mounjaro
- With alcoholMounjaro and alcohol — is it safe to drink?
- With foodShould Mounjaro be taken with food?
- Side effectsMounjaro side effects: common, rare and warning signs
- Dosage guideMounjaro dosage guide: how much to take and when
- OnsetHow fast does Mounjaro start working?
- DurationHow long does Mounjaro last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.