Short answer
Possibly. The FDA label for Zepbound says it may reduce the effectiveness of oral hormonal contraceptives because it slows stomach emptying. The label advises switching to a non-oral method, or adding a barrier method, for 4 weeks after starting and for 4 weeks after every dose increase. Non-oral hormonal methods should not be affected.
What the label says
The Zepbound prescribing information (section 8.3) says use of Zepbound may reduce the efficacy of oral hormonal contraceptives due to delayed gastric emptying. It adds that the delay is largest after the first dose and diminishes over time. The label tells prescribers to advise patients on oral contraceptives to switch to a non-oral method, or add a barrier method such as condoms, for 4 weeks after starting Zepbound and for 4 weeks after each dose escalation. Section 7 adds that hormonal contraceptives that are not taken by mouth should not be affected.
Why it happens
The label explains that Zepbound slows how quickly the stomach empties, which can change how much of a swallowed medicine is absorbed and when. That is why the concern applies to pills, not to methods that do not pass through the stomach. The same section tells prescribers to be cautious with other oral medicines, and to monitor people on drugs with a narrow safety margin, such as warfarin.
What to do about it
This page summarizes the FDA label and is not personal advice. If you take a birth control pill and are starting Zepbound or moving up a dose, tell your prescriber so you can agree a plan. The label also says to stop Zepbound when pregnancy is recognized, because it may cause fetal harm. Weight loss on its own does not make a pregnancy safer, so plan contraception on purpose.
Related questions
Does Wegovy have the same warning?
We did not find a contraceptive warning in the Wegovy label (revision 06/2026). That differs from Zepbound, so ask your prescriber about the medicine you actually take.
How long do I need backup contraception?
The Zepbound label says 4 weeks after you start and 4 weeks after each dose increase, for people on oral hormonal contraceptives. Your prescriber can tailor this to you.
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Sources
Published 2026-10-02 · Last checked 2026-10-02
Educational content, not medical advice. Made for the United States.