Testing Experimental Medication in Healthy Subjects

People with human immunodeficiency virus (HIV) often take several medicines to control HIV. Dolutegravir and darunavir boosted with cobicistat are HIV medicines that people may take. They may also need to take medicines for an infection called latent tuberculosis (TB). Researchers think a once-weekly treatment for latent TB would be easier for people with HIV to take. This once weekly treatment consists of two drugs: rifapentine and isoniazid. However, they need to see how TB drugs and HIV drugs interact. Objective: To learn how anti-HIV and anti-TB drugs affect each other so that people taking these drugs together can be treated safely. Eligibility: Healthy adults ages 18 65. Design: Participants will be screened with a medical history and physical exam. They will have vital signs taken and give a blood sample. Women will have a pregnancy test. Participants cannot take any other medicines during the study, including vitamins. Only occasional, infrequent use of acetaminophen (Tylenol , max 2000 mg/day), ibuprofen (Motrin or Advil ), naproxen (Aleve ), loperamide (Imodium ), and/or antihistamines (such as Benadryl , Zyrtec , Claritin , etc.) will be allowed. Participants will be assigned to one of three groups. Each group will take a different study drug, once or twice a day, for 19 23 days. At the baseline study visit, they will get a supply of the study drug tablets and instructions for taking them. Participants will keep a medicine diary to serve as a memory aid for taking medicine and reporting any side effects that they may experience. Participants will have 8 or 9 study visits over about 40 days. The number of visits depends on which group the person is assigned to. All visits will take place at the NIH Clinical Center. Participants will fast before study visits. The baseline visit will last about 2 3 hours. There will be 3-4 long visits that will last for about 12 hours. The other 4-5 visits will last about 1 hour. During all study visits, screening procedures will be repeated. During long visits, an intravenous (IV) line will be inserted into an arm vein with a needle. It will be used to take blood.