Depo provera
Depot medroxyprogesterone acetate (depo provera) suppresses ovulation and has been found to induce amenorrhea in up to 60% of women after 12 months use and 68% of women after 2 years use (Polancczky and Guarnaccia (1996). Among adolescents Harel et al (1995) reported a reduction in dysmenorrhoea symptoms in 64% of study participants using depo provera as a contraceptive method. However, there are concerns relating to its effect on bone mineral density in young
women and the potential loss of bone mineral density. The loss is apparently greater the longer the method is used and may not be completely reversible once use of the method ceases