Birth control pills have serious risks, which can be life threatening. They include blood clots, stroke, and heart attack. Smoking increases these risks, especially if you are over 35, so Pill users should not smoke. Common side effects include nausea, vomiting, weight gain, breast tenderness, and difficulty wearing contact lenses.
Some women should not take the Pill, including women who have blood clots, certain cancers, a history of heart attack or stroke, as well as those who could be pregnant. The Pill does not protect against HIV infection and other sexually transmitted diseases (STDs).