Does stemetil affect the contraceptive pill?

Stemetil and the OCP: Unlikely it would reduce the effectiveness of the pill, but it is metabolized by the liver which can make the liver metabolize pill hormones faster, so to be absolutely safe use a pill hormone recipe that is higher dose or does not need the liver to create the active form of the progestin, such as levonorgestrel, and you could consider continuous use of the hormones. Talk to your doctor as well.