- Female volunteers must be postmenopausal (for at least one year and confirmed by serum FSH at screening), surgically sterile, practising true sexual abstinence, or must use two highly effective methods of contraception as follows throughout the study until after post study physical examination: contraceptive implants, injectables, oral contraceptives, some intrauterine devices (IUDs), vasectomised partner and / or barrier method (condom or occlusive cap) with spermicidal foam/gel/film/cream/suppository.