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Calendar For Depo Provera Injections 2025. Please use the date calculator below to calculate the date of your next injection. The injection contains the hormone progesterone and works in three ways to prevent pregnancy from occurring.

The calendar is based on three month/15 week dosing intervals with the. Depo provera 150 mg injection is a synthetic progestin that replicates the effect of a natural female hormone called progesterone.