Contraception update: implantable and injectable methods.

ABSTRACT

PIP: Two new progestin-only contraceptive methods--levonorgestrel subdermal implants and Depo-Provera injection--have the potential to overcome adolescents' traditional poor compliance with family planning methods. Both methods provide safe, highly effective, reversible fertility control, but require virtually no ongoing patient compliance. The levonorgestrel implants provide continuous contraception for up to five years and have a failure rate under 1%. The primary side effect is an alteration in menstrual patterns: prolonged bleeding in 40%, irregular bleeding in 38%, intermenstrual spotting in 32%, more frequent bleeding in 16%, and amenorrhea in 12%. An average weight gain of five pounds over the five-year period of use is expectable given the appetite stimulation associated with progestins. Depo-Provera, injected every three months, has a failure rate of 0.1-0.7% in the first year of use. Amenorrhea is the most commonly reported menstrual side effect. Although both methods are highly effective in preventing pregnancy, they confer no protection against sexually transmitted diseases; thus, adolescent acceptors should be counseled to use condoms concomitantly.