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Simon Cork, Senior Lecturer in Physiology, Anglia Ruskin University

Wegovy and Mounjaro might affect how well your contraceptives work – here’s why

The UK's medicine regulator has issued a warning to those taking oral contraceptives. MillaF/ Shutterstock

Weight loss drugs, including Wegovy (semaglutide) and Mounjaro (tirzepatide), are becoming increasingly popular among those trying to lose weight. But a rise in so-called “Ozempic babies” has led the UK’s medicines regulator to issue guidance on their use by women of reproductive age.

The guidance comes after the agency received 40 reports of unintended pregnancies by women who had been using a weight loss drug. Of particular note is the effect that these drugs may have on the effectiveness of oral contraceptives.

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