The oral contraceptive (OC) is the most common form of birth control currently used in the United States.
Today's oral contraceptives bear no resemblance to first or even second-generation birthcontrol pills. Side effects of earlier generations of oral contraception have been virtually eliminated. Familiar examples of such side effects are water retention and weight gain.
The most marked difference between present-day OCs and the birth control pills of the 1960s is their reduction in dosage, with some "low-dose" pills containing as little as 20 mcg or less of estrogen. The first oral contraceptives typically contained between 100 and 175 mcg of estrogen and 10mg of progestin.
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