Missed a backup window on Zepbound or vomited your pill? Here is what to know about emergency contraception options while on a GLP-1, and who to ask fast.
If you missed a backup window, vomited your pill, or a condom broke, here’s what to do.
| Option | How it works | Time window |
|---|---|---|
| Levonorgestrel pill (e.g. Plan B) | Over the counter | Best within 72 hours, sooner is better |
| Ulipristal pill (ella) | Prescription | Up to 5 days |
| Copper IUD | Placed by a clinician | Up to 5 days, most effective option |
ACOG’s ordering is worth knowing: the copper IUD is the most effective emergency contraception, followed by ulipristal, then levonorgestrel.
EC pills are swallowed, so people reasonably ask whether a GLP-1’s slower stomach emptying could affect them. GLP-1 labels don’t address this, and it hasn’t been well studied. Because of that uncertainty, it’s worth asking a pharmacist whether a copper IUD or a particular pill makes more sense for you.
ACOG notes that levonorgestrel (Plan B and its generics) may be less effective at a BMI of 25 or above, and that it appears to lose effectiveness at a lower weight than ulipristal does. The copper IUD’s effectiveness doesn’t change with weight at all.
One thing ACOG is firm about: no one should be refused emergency contraception, or talked out of it, because of her weight. A less effective option taken now beats a better one you didn’t get. A pharmacist can help you choose.
There’s no specific label advice. Ask a pharmacist, who can help you choose the best option.
There’s no known interaction on the labels, but tell your prescriber you used it.
No. EC helps prevent pregnancy. It doesn’t end an existing pregnancy.