The oral-contraceptive interaction is a separate study (GPGR), reported in the FDA Mounjaro NDA 215866 summary review: a single 5 mg tirzepatide dose with a combination oral contraceptive (0.035 mg ethinyl estradiol / 0.25 mg norgestimate) reduced the Cmax of norelgestromin and ethinyl estradiol by 55% to 59% a range spanning both analytes, not a separate figure for each with AUC lowered 28.8% (norelgestromin) and 27% (ethinyl estradiol), and tmax delayed 2.5 to 4.5 hours
These variables include the peptide type, dosage, treatment duration, and how it is administered, including injections, oral, topical, and nasal spray-based treatments
Age, digestive conditions, certain medications, and even long-term stress can interfere
Vegans may need B12 supplements or consume B12-fortified foods
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