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It has been recognized for over 50 years that combined oral contraceptives (COCs) are also capable of offering health benefits beyond contraception through the treatment and prevention of several gynaecological and medical disorders.
Low-dose oral contraceptives contain less estrogen than other types of birth control pills. They contain 20 micrograms of estrogen, compared to 30 to 50 in other birth control pills. In healthy women, oral contraceptives have few side effects. Nausea, breast tenderness, weight gain, changes in mood, and breakthrough bleeding are the most common ones -- and these usually diminish with continued use.