Mounjaro contains an active ingredient called tirzepatide. It works by copying the behaviour of hormones called GLP-1 and GIP. By doing this, it can help in controlling feelings of hunger, managing your blood sugar and reducing cravings.¹

Its GLP-1 mimicry also means that it slows down gastric emptying. This is the time that it takes for food to empty out of your stomach. This can affect how well your body can absorb different medicines including oral contraception.¹

You don’t have to stop using oral contraception while using Mounjaro. But you should use barrier methods of contraception like condoms to avoid becoming pregnant for 4 weeks after starting mounjaro and for 4 weeks after increasing your dose.²

That means that you could be using barrier methods of protection for the duration of your treatment. Talk to your pharmacist and doctor if you have any concerns about using non-oral contraception.

If you want to have a baby, it’s important to know that the effect Mounjaro has on an unborn child has not been tested. Your pharmacist will likely ask you to postpone using the medicine until you have had your baby and have finished breastfeeding (if you have chosen to do so).²