Weight Loss Jabs: Birth Control Mix-Up Alert!

Dr. Wiljon Beltre, an obesity management specialist, is alerting women using GLP-1 medications for weight loss that their oral contraceptive pills may become less effective. He emphasizes the importance of using backup birth control methods, such as condoms, if relying on a birth control pill. The specific impact on contraceptive pill efficacy can vary depending on the GLP-1 medication used. While Wegovy does not directly interfere with oral pill absorption, drugs like Mounjaro and Zepbound may pose absorption issues. However, Wegovy's side effects, like nausea and vomiting, can lead to the pill being expelled before absorption. This is comparable to missing a pill, and severe diarrhea can also reduce hormone absorption.

This absorption issue also applies to Saxenda and Victoza. Furthermore, significant weight loss, around 15-20%, can reset hormones. This may cause women with conditions like PCOS or severe obesity, who previously believed they were infertile, to start ovulating again, thereby increasing natural fertility. Combining this with a birth control pill that has not been properly absorbed creates a high risk for unplanned pregnancies. Dr. Beltre recommends switching to an intrauterine system (IUS), patch, or implant if frequent nausea is experienced. For Mounjaro, a direct absorption issue is highlighted due to its impact on stomach emptying, potentially reducing contraceptive hormone levels absorbed into the bloodstream by approximately 20%. Therefore, individuals relying on oral birth control pills should use a backup method for four weeks after their first jab and after every dose increase.