Australia’s medicine watchdog says it can’t rule out that weight-loss injections reduce the effectiveness of oral contraceptives, as hundreds of women fall pregnant while using the injections.

Women are advised to stop using GLP-1s – a type of drug used for type 2 diabetes and weight loss – at least one to two months before trying to conceive, due to concerns about the drugs’ potential effect on a developing fetus.

Hundreds of women are falling pregnant while using weight-loss injections.

But the drugs may have created a perfect storm for unintended pregnancies: the weight loss they trigger can improve fertility, while the medication may also reduce the effectiveness of oral contraceptives.

Telephone health services are reporting a steady stream of calls from women who have had an unpl

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