How fast does tirzepatide work?

Three clocks run at once. Appetite effects: days to weeks — most patients notice quieter food noise within the first few injections. Meaningful weight change: months — titration itself spans 16–20 weeks to reach full doses, and loss accrues steadily through it. Trial-scale results: the long arc — the ~20%-class SURMOUNT averages were measured at 72 weeks, not 72 days. The honest early benchmark many clinicians use: roughly 5% by weeks 12–16 on an adequate dose suggests you’re a responder on pace; slower isn’t failure — holds and adjustments are normal — but it’s a prescriber conversation, not a program-hopping trigger.