Sex & body
DR SALLY COCKBURN,
GF’S RESIDENT DOCTOR. Wondering Missing in action
Implanon is the rod shaped progesterone-only contraceptive agent usually implanted just under the skin of the inner part of your upper arm. It is very reliable (more than 99.9% effective) when properly inserted. It works by stopping ovulation, thickening cervical mucus so sperm can’t swim through, and thinning the uterus lining to prevent fertilised eggs implanting. It should be taken out and changed every three years. Some people’s cycle will stop completely, while others still get spotting. A number of medications and herbal preparations can interfere with the action of
Implanon – these include some drugs for epilepsy, some fungal treatments and St Johns Wort. I am concerned that your bleeding pattern has changed and although the implant should still be active I think it’s important to assess any meds you may be taking and take a test to rule out pregnancy. It might be fine but please see your GP.