Try our beta test site
IMPORTANT: Listing of a study on this site does not reflect endorsement by the National Institutes of Health. Talk with a trusted healthcare professional before volunteering for a study. Read more...

Once-Daily Drug Regimen for HIV-Infected Patients

This study has been completed.
Information provided by:
National Institutes of Health Clinical Center (CC) Identifier:
First received: January 18, 2000
Last updated: March 3, 2008
Last verified: December 1999

This study will examine the safety of giving antiviral therapy for HIV infection in a once-daily dosing schedule, and assess how well patients tolerate this regimen. A once a day dosing schedule may be easier for some people to follow than one that requires taking medicine 2 or 3 times a day. The ease of treatment is important, because not following the prescribed dosing regimen may make therapy less effective or ineffective.

HIV-infected patients 18 years and older who have never been treated for their infection may be eligible for this study. Candidates will be screened with a history and physical examination, including blood tests. Participants will take the following medications once a day: 1200 mg of amprenavir (8 capsules); 300 mg of ritonavir (3 capsules); 600 mg of abacavir (2 pills); and 300 mg of lamivudine (2 pills). Patients will have routine blood tests and be seen by a nurse or doctor, or both, at follow-up visits at weeks 2, 4, 8, 12, and 16; then every 8 weeks until week 48; and then every 3 months for up to 3 years. At week 2, a special blood test will be done over the course of a day to measure blood drug levels. For this test, blood samples will be drawn 8 times over a 24-hour period. A heparin lock (a device that allows the needle to remain in the vein) will be used to avoid multiple needle sticks.

Condition Intervention Phase
Acquired Immunodeficiency Syndrome
HIV Infections
Drug: Amprenavir
Drug: Ritonavir
Drug: Abacavir
Drug: Lamivudine
Phase 1

Study Type: Interventional
Study Design: Primary Purpose: Treatment
Official Title: A Pilot Study of Once-Daily Therapy With Amprenavir, Ritonavir, Lamivudine and Abacavir in HIV-Infected, Antiretroviral-Naive Patients

Resource links provided by NLM:

Further study details as provided by National Institutes of Health Clinical Center (CC):

Estimated Enrollment: 25
Study Start Date: January 2000
Estimated Study Completion Date: November 2000
Detailed Description:
The development of a once-daily anti-retroviral regimen is a priority because regimen simplicity might enhance regimen adherence, and because a once-daily regimen would be useful for directly observed therapy. Pharmacokinetic modeling suggests that plasma levels of amprenavir in the presence of ritonavir, a potent inhibitor of cytochrome p450, should be high enough to support once-daily dosing. Lamivudine is currently being explored in other studies in once-daily dosing. Abacavir has not been used once daily but some in vitro studies suggest that such dosing might be appropriate. In this uncontrolled, open-label study, amprenavir 1200 mg daily, ritonavir 300 mg daily, lamivudine 300 mg daily, and abacavir 600 mg daily will be administered to up to 25 HIV-infected, anti-retroviral naive patients. The objectives are to assess the tolerability and safety of this regimen; the plasma concentrations of amprenavir; and the anti-viral response. Study evaluations include percentage of patients who have discontinued the regimen by weeks 16 and 24 for toxicity, intolerance or failure; the number of grade 3 and 4 adverse events by weeks 16 and 24; the antiviral response at weeks 16, 24, and 48 (change from baseline and percentage of patients with viral load less than 50 copies and less than 400 copies per mL), and the number (percent) of patients with trough plasma concentrations of amprenavir above 280 ng/mL.

Ages Eligible for Study:   Child, Adult, Senior
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Adults (greater than 18 years) infected with HIV-1.

Plasma viral burden greater than 8,000 and less than 60,000 RNA copies per ml. by bDNA method at screening.

CD4 cell count above 200 cells per microliter at screen.

No prior treatment with any anti-retroviral agent.

Laboratory values at screen: hemoglobin greater than 9 g per dl; granulocyte count greater than 900 cells per microliter; platelet count greater than 80,000 cells per microliter; AST (SGOT) less than 151 U/L; creatinine less than 2 mg/dL.

Must not be pregnant or breast-feeding and willing to avoid pregnancy by the use of non-hormonal methods of birth control during study participation. Pregnancy test (blood or urine) must be negative within two weeks prior to dosing with study medications.

Willing and able to provide written informed consent.

No history suggestive of malabsorption.

No chronic diarrhea.

Must not have had treatment with systemic corticosteroids at greater than physiologic replacement doses, interleukins, interferons, radiation therapy or cytotoxic chemotherapeutic agents within 30 days of study drug administration or an anticipated need for radiation or chemotherapy treatment within the next 48 weeks (with the exception of local treatment of Kaposi's sarcoma).

Must not have current or anticipated therapy with other agents with documented activity against HIV-1 in vitro.

Must not have active, untreated opportunistic infection or other major illness that would, in the opinion of the investigator, increase the risk that adverse events might pose to the patient or might render the patient too ill to return for study visits.

Must not have significant substance abuse or psychiatric illness that might interfere with assessment or compliance.

Must not have current or anticipated future need for any of the following drugs which are contraindicated with an amprenavir-ritonavir regimen because of drug-drug interactions: Terfenadine (Seldane), Astemizole (Hismanal), Cisapride (Propulsid), Triazolam (Halcion), Bepridil (Vascor), Medazolam (Versed), Rifampin (Rifadin, Rifamate, Rifater), Ergotamine/Dihydroergotamine containing regimens (Ergomar, Wygraine, Ercaf, DHE, Migranal), Amiodarone (Cordarone), Flecanaide (Tambocor), Propafenone (Rythmol), Quinidine (Quinaglute, Cardioquin), and Pimozide (Orap).

Must not have current or anticipated future need for the following anticonvulsants: phenobarbital, phenytoin, carbamazepine.

  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00001968

United States, Maryland
National Institute of Allergy and Infectious Diseases (NIAID)
Bethesda, Maryland, United States, 20892
Sponsors and Collaborators
National Institute of Allergy and Infectious Diseases (NIAID)
  More Information

Publications: Identifier: NCT00001968     History of Changes
Other Study ID Numbers: 000053
Study First Received: January 18, 2000
Last Updated: March 3, 2008

Keywords provided by National Institutes of Health Clinical Center (CC):
Anti-Retroviral Therapy
Drug Interactions
Protease Inhibitor

Additional relevant MeSH terms:
HIV Infections
Immunologic Deficiency Syndromes
Acquired Immunodeficiency Syndrome
Lentivirus Infections
Retroviridae Infections
RNA Virus Infections
Virus Diseases
Sexually Transmitted Diseases, Viral
Sexually Transmitted Diseases
Immune System Diseases
Slow Virus Diseases
HIV Protease Inhibitors
Protease Inhibitors
Enzyme Inhibitors
Molecular Mechanisms of Pharmacological Action
Anti-HIV Agents
Anti-Retroviral Agents
Antiviral Agents
Anti-Infective Agents
Cytochrome P-450 CYP3A Inhibitors
Cytochrome P-450 Enzyme Inhibitors
Reverse Transcriptase Inhibitors
Nucleic Acid Synthesis Inhibitors
Antibiotics, Antitubercular
Antitubercular Agents
Anti-Bacterial Agents processed this record on April 26, 2017