Regulators in the United Kingdom issued guidance on Thursday, warning that weight loss and diabetes medications may weaken the effectiveness of birth control and may be harmful for pregnant women.

The Medicines and Healthcare products Regulatory Agency (MHRA) said women taking tirzepatide, sold under the brand name Mounjaro, may need to use another form of contraception.

This is because Mounjaro, a medication licensed to treat diabetes and for weight loss management in the U.K. in conjunction with diet and exercise, may reduce the effectiveness of oral contraceptives in those who are overweight.

The MHRA advised women taking Mounjaro who are overweight and are using an oral form of contraception to also use a non-oral form of contraception, such as a birth control implant, an intraute

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