Injected contraceptives are given once every 3 months. Most injectables are progestin-only. In the United States, depo-medroxyprogesterone acetate (Depo-Provera) is the only approved injected contraceptive. Depo-Provera (also called Depo, or DMPA) uses a progestin called medroxyprogesterone.
Depo-Provera is very effective in preventing pregnancies. About 3 in 100 women who use it become pregnant. However, Depo also carries the risk for many mild and serious side effects....Read more
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Source: ADAM Encyclopedia
Oral Contraceptives and Combination Hormonal MethodsOral contraceptives (birth control pills) are available only by prescription and come in either a... Read more »