 1. Be a healthy, non-smoking or smoking 10 cigarettes per day male of any race, at least 18 years old and no more than 55 years old, inclusive. As the effect of the study drug on sperm is still unknown, male subjects should refrain from donating sperm or plan a pregnancy with their partner throughout the study and after 90 days, and must report immediately to the study doctor if its partner becomes pregnant during the study and after 90 days. The male subject will have to use double-barrier contraceptive methods: male condoms and spermicide. 