Moving from Wegovy (semaglutide) to Zepbound (tirzepatide)? Here is what changes: the dose, side effects, and new birth control advice if you take the pill.
Coverage or cost, supply, side effects, or how well the first medicine worked. Your prescriber will weigh these with you.
| Wegovy | Zepbound | |
|---|---|---|
| Ingredient | Semaglutide | Tirzepatide |
| How it works | GLP-1 | GLP-1 + GIP |
| Weekly | Yes | Yes |
| Pill backup advice on label | No | Yes: 4 weeks after starting and each increase |
| Missed-dose rule | Per Wegovy label | Within 4 days, otherwise skip |
No label covers switching from one of these to the other, so there is no official rule here — this is your prescriber’s call, and their instruction beats anything you read, including this. What’s commonly done is to take the first Zepbound dose on the day the next Wegovy dose would have been due, since both are weekly. Don’t take both.
Zepbound’s label starts everyone at 2.5 mg weekly for 4 weeks, whatever they were on before, but your prescriber may choose differently based on your history.
If you’re on the pill, your first Zepbound dose starts a 4-week backup window, and so does each increase. This is new if you’re coming from Wegovy.
Kara, 42, switched when her insurance changed. She took her first Zepbound dose on her usual Wegovy day, started using condoms because of the new backup advice, and logged her nausea for two weeks so she could report back to her prescriber.
They’re different medicines. Ask your prescriber how they compare for you.
Possibly. Your prescriber will guide you.
Some people do when switching. They often ease with time.