Mounjaro contains tirzepatide, which targets both the GIP and GLP-1 receptors. This dual action creates a more pronounced delay in gastric emptying compared to medications that only target GLP-1, such as semaglutide.

During clinical development, Eli Lilly conducted dedicated drug interaction studies that measured how tirzepatide affected the absorption of oral contraceptives containing ethinyl estradiol and norgestimate. The studies found clinically relevant reductions in peak hormone concentrations, which led the FDA to require the contraceptive interaction warning in the labeling.

While semaglutide-based products also slow gastric emptying, their prescribing information does not carry the same explicit warning. This does not necessarily mean semaglutide is safer for oral contraceptive users. It may simply reflect differences in how the manufacturers designed their studies.

The FDA recommends backup contraception for four weeks after your initial Mounjaro injection and for four weeks after each dose escalation. Since Mounjaro's titration involves multiple step-ups (2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, and 15 mg), this can cover a significant portion of your early treatment.

A practical approach for many patients is to use backup contraception throughout the entire titration phase. Once you have been on your maintenance dose for at least four weeks without significant GI symptoms, the absorption risk decreases.

That said, isolated episodes of vomiting or diarrhea at any point during treatment can still compromise pill absorption. Stay alert to these events and use backup protection when they occur.

You can continue taking oral birth control while on Mounjaro, but you should be aware of the reduced reliability and plan accordingly. Staying on the pill means:

• Using condoms or another barrier method as backup during dose changes
• Being vigilant about timing your pill consistently
• Treating any episode of vomiting within a few hours of your pill as a missed dose
• Watching for breakthrough bleeding, which may signal reduced hormone absorption

For patients who want to eliminate the worry entirely, switching to a non-oral method is the most reliable path. Our FormBlends physicians can help you weigh the options. Mounjaro

Non-oral methods are completely unaffected by Mounjaro's impact on digestion. The most popular options include:

• IUDs: Both hormonal (Mirena, Kyleena, Liletta) and copper (Paragard) options provide years of hassle-free protection
• Nexplanon implant: A small rod placed under the skin of the arm that lasts up to three years
• Depo-Provera injection: Given every 12 weeks in a clinic or at home
• Patches: Applied to the skin weekly (Xulane)
• Vaginal ring: NuvaRing (monthly) or Annovera (yearly)

Each of these delivers contraceptive hormones (or, in the case of the copper IUD, non-hormonal protection) through a route that has nothing to do with your stomach or intestines.

Mounjaro produces substantial weight loss, with some patients losing 15% to 21% of their body weight in clinical trials. This degree of weight loss can have far-reaching effects on reproductive health:

• Improved ovulation: Weight loss can restore regular menstrual cycles and ovulation in people with obesity-related anovulation
• PCOS improvement: Reduced insulin resistance and hormonal rebalancing can significantly improve PCOS symptoms
• Increased fertility: Some patients who previously struggled to conceive find that their fertility improves as they lose weight

This creates a dual concern for patients on the pill: the medication may reduce contraceptive absorption while simultaneously increasing fertility through weight loss. It is a combination that demands careful contraceptive planning.

No. Mounjaro is not approved for use during pregnancy. Animal reproduction studies have shown adverse developmental effects, and the medication should be discontinued before conception.

The recommended washout period is at least one month, though many physicians advise stopping two months before a planned pregnancy to ensure the medication is fully cleared. If you become pregnant unexpectedly while on Mounjaro, stop the medication and consult your healthcare provider right away.

If pregnancy is part of your future plans, our FormBlends team will help you create a timeline that allows you to benefit from weight loss before transitioning off the medication in preparation for conception. tirzepatide