Contraception

Norplant and Depo-Provera Provide Effective Contraception Sooner than Previously Thought

Published in Women's Health Weekly, March 16th, 1998

Two studies of the long-acting, progestin-only contraceptives, Norplant and Depo-Provera, have concluded that back-up methods of contraception are needed for shorter periods of time than was previously recommended for these contraceptives.

While both contraceptives are thought to work by inhibiting ovulation and by changing cervical mucus to prohibit sperm penetration, these studies focused only on cervical mucus changes. From approximately the ninth day of the menstrual cycle until just before ovulation, cervical mucus is thin and watery and penetrable by sperm. After ovulation, serum progestin levels increase and the mucus becomes thick and opaque and impenetrable...

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Source: Women's Health Weekly (1998-03-16)

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