- Male volunteers must agree to use a double barrier method of contraception including abstinence, condom plus diaphragm or condom plus IUD or condom plus stable oral/transdermal/injectable hormonal contraceptive by female partner for at least 14 days prior to the time of the first dose of study drug through 90 days after the last dose of study drug and must also agree to not donate sperm for 90 days after the last dose of study drug. Vasectomy with zero sperm count for 6 months minimum prior to the first dose of study drug is an acceptable form of contraception