A narrative review in the American Journal of Obstetrics and Gynecology (8 October 2026) pulled together what is known about glucagon-like peptide-1 receptor agonists and hormonal contraception. The authors found few studies that examine the two together and describe substantial gaps, particularly for the newer, higher-dose obesity regimens.
The concern runs in two directions. Delayed gastric emptying may alter absorption of oral contraceptives, especially around initiation and dose escalation, and weight loss in women with obesity or polycystic ovary syndrome may restore ovulation in someone who had assumed she could not conceive. The review's central recommendation is that contraceptive counselling becomes a routine part of starting these drugs.
In practice that means asking about pregnancy intention before the first prescription, not after the first missed period. Where an oral method is in use and the agent is one whose label warns about reduced oral contraceptive exposure, discuss a non-oral method or back-up during initiation and escalation. Because these drugs are not recommended in pregnancy, a plan for stopping before conception is part of the same conversation.
- Ask about pregnancy plans and current contraception before the first GLP-1 receptor agonist prescription.
- Tirzepatide's label advises women on oral contraceptives to switch to a non-oral method or add a barrier method for 4 weeks after starting and after each dose increase.
- Warn women with PCOS or obesity that ovulation may return as weight falls, even after years of irregular cycles.
- Agree when to stop the drug if pregnancy is planned; these agents are not recommended in pregnancy.
- Long-acting reversible methods avoid the oral absorption question altogether and are worth offering.
Why it matters
The prescriber starting the drug is often not the person who thinks about contraception, and that is where unplanned pregnancies slip through.
Don't overread it
This is a narrative review; it describes plausible interactions and gaps rather than measured failure rates.
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