How long does Tirzepatide
stay in your system?
Tirzepatide is the active ingredient in both Mounjaro and Zepbound. It has an elimination half-life of approximately 5 days, the same pharmacokinetics as Mounjaro.
Based on Mounjaro half-life · 5 days
Related products
Tirzepatide is the active ingredient in both Mounjaro and Zepbound. The molecule is the same regardless of brand name; Mounjaro is marketed for type 2 diabetes and Zepbound for chronic weight management. Its roughly 5-day half-life is what allows once-weekly dosing.
Because the half-life is about five days against a seven-day dosing interval, tirzepatide accumulates over the first weeks of treatment rather than clearing fully between injections. A single-dose estimate like this one understates the total in your system once you have been on a stable weekly schedule for a month or more.