Depot Contraception With and Without Lopinavir/Ritonavir

DMPA (depot medroxyprogesterone acetate or the 'depot' injection) is a widely used contraception. It is popular in woman with HIV as it probably still works when you take HIV drugs. HIV drugs can increase or decrease the level of other drugs (e.g. contraceptives) in your bloodstream which may make them work less well or increase side effects. It is assumed that DMPA can be given with HIV drugs there are no studies proving this. The purpose of the study is to investigate whether an HIV drug combination containing lopinavir/ritonavir affects DMPA when they are taken at the same time.