Why does Zepbound start at 2.5 mg and Wegovy at 0.25 mg? Here is how dose escalation works, why it is slow on purpose, and what each step means for side effects and birth control.
“Why am I on such a small dose?” is a very common first-week question. Here’s the answer.
For most GLP-1s, the first dose is mainly there to help your body get used to the medicine. The dose that’s expected to do most of the work comes later.
| Medicine | Starts at | Steps | Minimum time per step |
|---|---|---|---|
| Zepbound / Mounjaro | 2.5 mg weekly | +2.5 mg per step, up to 15 mg | 4 weeks |
| Wegovy (shot) | 0.25 mg weekly | 0.5 → 1 → 1.7 → 2.4 mg | 4 weeks |
| Wegovy pill | 1.5 mg daily | 4 → 9 → 25 mg | 30 days |
These come from the labels. Zepbound goes up in 2.5 mg steps after at least 4 weeks, to a maximum of 15 mg weekly. Wegovy’s shot reaches 2.4 mg at week 17. The Wegovy pill moves on days 31, 61 and 91, to a maintenance dose of 25 mg.
Your prescriber may keep you on a dose longer if:
There’s no prize for reaching the top dose fast.
Write down each dose and the date it started. It helps you:
Monica, 47, is on Zepbound 5 mg and her nausea is still strong. At her check-in she asks to stay at 5 mg another month instead of moving to 7.5 mg. Her prescriber agrees. A month later she feels settled and steps up with far fewer side effects.
| Date | Dose | Side effects week 1 | Backup window ends (if on the pill) |
|---|---|---|---|
| Jan 5 | 2.5 mg | Mild nausea | Feb 2 |
| Feb 2 | 5 mg | Moderate nausea, 3 days | Mar 2 |
| Mar 30 | 7.5 mg | Mild | Apr 27 |
A log like this makes each conversation with your prescriber quick and clear.
Shortages and pharmacy delays sometimes affect the next dose. Don’t substitute doses or products on your own. Call your prescriber for a plan.
No. Always follow your prescriber’s schedule. Faster increases can make side effects much worse.
Your prescriber may lower your dose if side effects are hard to manage. Don’t change it on your own.
The dose you stay on long term. Your prescriber chooses it based on how you respond.
You may be doing well, or side effects may need more time to settle. Ask them what they’re watching for.
Side effects are often more noticeable right after each increase, then ease.