GLP-1 treatment, contraception and planning a pregnancy: what to know

Social media carries stories of unexpected pregnancies during GLP-1 treatment. A plausible explanation: excess weight can disrupt ovulation, for example with PCOS. As weight falls, cycles may normalise and fertility can rise.

It's not an effect to rely on in either direction, and robust data are still scarce.

Vomiting and severe diarrhoea can affect how well the pill is absorbed, whatever the treatment. That matters especially during titration, when gut complaints are more common.

For tirzepatide, the product information also states that the effect of oral contraceptives may be reduced in certain phases of treatment and recommends an additional or different method then. Ask your gynaecologist which method suits you during treatment. Whether and how a switch or a dose change happens is decided by the doctor in each individual case.

If you want to become pregnant, say so openly when treatment is prescribed. Treatment is then stopped beforehand. How long before depends on the medicine and is in the product information.

If you become pregnant during treatment, stop the medicine and contact a doctor promptly. GLP-1 medicines for weight management are also not used while breastfeeding.

This Journal article offers general information. It is not a diagnosis, a prescription or a promise of any result. Whether treatment is suitable for you is decided by a doctor after reviewing your questionnaire. For acute or severe symptoms, contact your GP, the out-of-hours medical service (116117) or, in an emergency, 112. Whether and how a switch or a dose change happens is decided by the doctor in each individual case.