A Study of T-20 in HIV-Positive Adults

Inclusion Criteria Concurrent Medication: Allowed: * Any antiretroviral agent, provided the regimen has not changed within 6 weeks of the screening visit. * Antibiotics for bacterial infections. * Prophylactic medications for P. carinii pneumonia and for M. avium, including azithromycin. * Medications for symptomatic treatment such as antipyretics, analgesics, and antiemetics. Patients must have: HIV-1 seropositive status. Exclusion Criteria Co-existing Condition: Patients with the following symptoms or conditions are excluded: Concurrent neoplasm (except for basal cell carcinoma of the skin, in situ carcinoma of the cervix, and non-disseminated stable Kaposi's sarcoma). Concurrent Medication: Excluded: * Patients must not be taking any concurrent antiretroviral therapy (for at least 2 weeks prior to baseline) or the patient is to be on a stable antiretroviral regimen which has not changed for at least 6 weeks prior to baseline. * Treatment with any of the following: * immunomodulators, biological response modifiers, chemotherapy that cannot be discontinued for the duration of the study, astemizole, terfenadine, cisapride, triazolam, midazolam, rifampin, clarithromycin, or an investigational drug within 30 days prior to the initial visit. Patients with the following prior conditions are excluded: * Evidence of active opportunistic infections, or unexplained temperature greater than or equal to 38.5 Celsius for 7 consecutive days within 30 days prior to screening visit. * Chronic diarrhea (defined as greater than 3 liquid stools per day which persists for 15 days) within 30 days prior to screening visit. * Diagnosis of hemophilia or other clotting disorders. Prior Medication: Excluded: \- Prior treatment with an HIV vaccine. Prior Treatment: Excluded: Major organ allograft. Risk Behavior: Excluded: Evidence of substance abuse or addiction that, in the opinion of the investigator, may interfere with the patient's ability to comply with the dosing schedule and protocol evaluations.