GLP-1 Dosing & Titration Schedules: Semaglutide vs Tirzepatide

Both major GLP-1 molecules start low and step up gradually — that pattern is not a marketing choice, it is the labeled schedule that keeps the GI side effects manageable while the dose reaches an effective level. Here is exactly what each label specifies, pulled directly from the FDA-approved prescribing information for the brand products.

Tirzepatide (Zepbound): the labeled schedule

The exact same schedule and 15 mg ceiling apply to Mounjaro, tirzepatide's diabetes-branded twin — see Mounjaro vs Zepbound for why the identical drug and dose still comes with a very different price tag depending on which brand name is on the box.

Per Zepbound's FDA prescribing information, the starting dose for every indication is 2.5 mg injected subcutaneously once weekly for 4 weeks — a dose too low to expect much weight-loss effect from on its own, purely an initiation step. After 4 weeks, the dose increases to 5 mg once weekly, and from there it "may be increased in 2.5 mg increments, after at least 4 weeks on the current dose"¹. The maintenance dose range for weight reduction is 5 mg, 10 mg or 15 mg once weekly; the maximum labeled dose across all indications is 15 mg once weekly. That means, at the fastest labeled pace, reaching the maximum dose takes a minimum of 16 weeks (four 4-week steps from 2.5 to 15 mg) — many people and providers deliberately move slower than that minimum.

Semaglutide (Wegovy): the labeled schedule

Per Wegovy's FDA prescribing information, the injectable starting dose is 0.25 mg once weekly for weeks 1–4 — again, a sub-therapeutic initiation dose. The schedule then steps up every 4 weeks: 0.5 mg for weeks 5–8, 1 mg for weeks 9–12, 1.7 mg for weeks 13–16, reaching a maintenance dose at week 17². For weight reduction in adults, the recommended maintenance dose is 1.7 mg or 2.4 mg once weekly; the label also permits increasing to a maximum of 7.2 mg once weekly for additional weight loss in patients who have tolerated 2.4 mg for at least 4 weeks — a higher ceiling than many patients realize exists, and one that came later than the original approval. At the standard labeled pace, reaching the 2.4 mg maintenance dose takes 16 weeks.

Why the schedule is this specific, not arbitrary

Both molecules were titrated on this same step-up structure in their pivotal trials — the exact schedule tested is the schedule that produced the efficacy numbers cited throughout this site, for tirzepatide's SURMOUNT-1 results³ and semaglutide's STEP 1 results⁴ alike. A provider who titrates faster than the label — a real practice at some compounded telehealth providers chasing faster visible results — is running an untested schedule against the trial evidence that established both the efficacy and the side-effect profile these drugs are known for. Slower-than-labeled titration, by contrast, is common and generally considered reasonable when side effects warrant it; the label sets a maximum pace, not a mandatory one.

What this means when comparing providers

If a compounded provider's plan looks meaningfully faster than the schedules above — reaching a high dose in under 8 weeks, for instance — that is a real deviation from the tested protocol worth asking about directly, not a sign of a better program. Confirm your provider's titration plan against these labeled schedules before you start, and reference them again any time a dose increase feels too aggressive for what you're experiencing. Some people deliberately do the opposite — staying at or near the starting dose long-term rather than titrating up; what the actual dose-response data shows about that is worth reading before you decide it's a free way to save money. And once you've settled on a schedule, how to actually inject semaglutide — sites, rotation, and what a missed dose means — covers the mechanics the label specifies. For the cost side of how titration pace affects your monthly bill as doses (and often prices) increase, see the true monthly cost of GLP-1, beyond the sticker price. Not medical advice — your actual titration schedule should be set by a licensed clinician who knows your history; see our medical disclaimer.