- Females(of child bearing potential) must have a negative pregnancy test prior to the dose of investigational product and, unless surgically sterile (ie, bilateral tubal ligation, bilateral oophorectomy, or complete hysterectomy), has a sterile male partner, or at least 2 years postmenopausal, or practices abstinence; must use 2 effective methods of avoiding pregnancy (including oral, transdermal, or implanted hormonal contraceptives, intrauterine device, female condom with spermicide, diaphragm with spermicide, cervical cap with spermicide, or use of a condom with spermicide by the sexual partner) for 21 days prior to randomization, and must agree to continue using such precautions until 3 months after dosing with the investigational product; cessation of birth control after this point should be discussed with a responsible physician. A negative pregnancy test is required both at screening and prior to dosing.