Birth control pills have no significant long-term side effects. Side effects of birth control pills are not universal, and most of them usually disappear within two to three months. Before learning about the side effects of birth control pills, let's understand a little bit about them. Birth control pills are small doses of hormones taken daily for 21 days to prevent pregnancy. The hormones are either a combination of synthetic progesterone and estrogen or just progesterone (called mini pill). Birth control pills have side effects just like other medications. It's necessary to take these pills every day to prevent pregnancy.All Rights Reserved