- Gender: Male or eligible female - Females are eligible to participate only if they are currently non-pregnant and non-lactating. To be eligible for entry into the study, females of childbearing potential must commit to consistent and correct use of an acceptable method of birth control, as defined by the following: Male partner who is sterile prior to the female subject's entry into the study and is the sole sexual partner for that female subject, Implants of levonorgestrel, Injectable progestogen, Oral contraceptive (either combined estrogen/progestin or progestin only), Any intrauterine device (IUD) with a documented failure rate of less than 1% per year, Double-barrier method - spermicide plus a mechanical barrier (e.g., spermicide plus a male condom or a spermicide and female diaphragm), The contraceptive transdermal patch, Ortho Evra (if the subject is less than 198 pounds), Female subjects should not be enrolled if they plan to become pregnant during the time of study participation. A urine pregnancy test is required for all subjects at all visits, Female subjects should not be enrolled if they plan to become pregnant during the time of study participation. A urine pregnancy test is required for all subjects at all visits, Female subjects should not be enrolled if they plan to become pregnant during the time of study participation. A urine pregnancy test is required for all subjects at all visits, Females of childbearing potential who are not sexually active must commit to complete abstinence from intercourse throughout the clinical trial, and for a period after the trial to account for elimination of the drug (minimum of six days),