Drug Interactions Among Anti-HIV Agents
This study examined the interactions of various drugs used to treat HIV infection in order to design larger studies of possible combinations for people who continue to have high viral levels despite combination therapy.
HIV-infected patients 18 years of age and older who have a viral load of at least 500 copies/mL; who have received 20 weeks of protease inhibitor therapy, with the same protease inhibitors in combination therapy for the last 12 weeks; and who have never been treated with abacavir, amprenavir or efavirenz were enrolled.
All patients will receive 600 milligrams a day of efavirenz (a non-nucleoside reverse transcriptase inhibitor); 300 mg twice daily of abacavir (a nucleoside analog); and 1200 mg twice a day of amprenavir (a protease inhibitor). In addition to these drugs, six patients will receive 500 mg twice a day of ritonavir (a protease inhibitor); six patients will receive 200 mg twice a day of ritonavir; and 10 will receive 1250 mg twice a day of nelfinavir (a protease inhibitor).
Patients in the two ritonavir groups (500-mg and 200-mg dose groups) took abacavir and amprenavir for one week and then come to the clinic for blood tests to measure drug levels before taking their morning pills and at 1/2, 1, 2, 4, 8, and 12 hours after taking the medicines. They will then add ritonavir to their treatment regimen. After one week, they will return for blood tests as before. They will then add efavirenz to their regimen and had bloods drawn again after another 1 or 2 weeks.
Patients in the nelfinavir group took abacavir, amprenavir and nelfinavir for one week and then have blood sampling as described above for the ritonavir group. They will then add efavirenz to the regimen and repeat the blood tests again after another 1 or 2 weeks.
Participants are being seen in the clinic for follow-up only if they wish to continue to participate and if the regimen appears to offer clinical benefit.
Drug: Amprenavir, Efavirenz, Abacavir, Nelfinavir, Ritonavir
|Study Design:||Endpoint Classification: Safety Study
Primary Purpose: Treatment
|Official Title:||Pharmacokinetic Interactions Between Ritonavir, Amprenavir and Efavirenz and Nelfinavir, Amprenavir, and Efavirenz in People Infected With HIV|
|Study Start Date:||August 1998|
|Estimated Study Completion Date:||August 2003|
Please refer to this study by its ClinicalTrials.gov identifier: NCT00001766
|United States, Maryland|
|National Institute of Allergy and Infectious Diseases (NIAID)|
|Bethesda, Maryland, United States, 20892|