OCR General Certificate of Secondary Education (GCSE) Biology Practice Exam

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How long is the injection method for preventing pregnancy effective?

Up to 1 month
Up to 3 months
Up to 6 months
Up to 12 months

The correct answer is: Up to 3 months

The injection method for preventing pregnancy, commonly referred to as Depo-Provera or contraceptive injection, is effective for up to 3 months. This method involves receiving an injection of progestin, which is a synthetic form of the hormone progesterone. The injection works by preventing ovulation, thickening cervical mucus, and thinning the lining of the uterus to prevent a fertilized egg from implanting. Given its mechanism of action and formulation, the contraceptive injection provides protection against pregnancy for about 12 weeks, or 3 months. After this period, the effectiveness diminishes, making it necessary to receive another injection to maintain its contraceptive effects. It's important for individuals using this method to keep track of their injection schedule to ensure continuous protection against unintended pregnancy.