If administered within the first 5 days after the onset of a normal menstrual period, medroxyprogesterone is effective from the day of injection. When medroxyprogesterone is given later in the menstrual cycle it may not be effective for the first 3 to 4 weeks after the injection and another method of contraception (nonhormonal) should be used during this time.
However, please seek more accurate info from the doc/gynecologist who prescribed or suggested to take the shot of Depo-Provera, take care, hope the info helps?
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