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Injectable Contraceptive |
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Injection of medroxyprogesterone, a progestin, prevents pregnancy by stopping the menstrual cycle. Injections into the buttocks or upper arms once every 3 months may be effective for 3 months to 1 year.
(From KS Saladin, Anatomy and Physiology, 1998, WCB McGraw-Hill, p. 1020; with permission. © The McGraw-Hill Companies, Inc./Bob Coyle, photographer)