A dapivirine (DPV)-releasing vaginal ring (DapiRing®, containing 25 mg DPV) has been approved in various African countries for prevention of human immunodeficiency virus type 1 (HIV-1). Current research is focused on next-generation multipurpose prevention technology (MPT) vaginal rings that additionally provide contraception, and a combination dapivirine + levonorgestrel ring is in clinical development. However, hormonal contraceptives have numerous side effects and contraindications, and many women are interested in hormone-free contraceptive options. Copper and zinc have well documented spermicidal activity
for example, copper intrauterine devices-comprising a copper metal wire fitted to a polyethylene frame and releasing cupric (Cu