Diltiazem CD and amlodipine are drugs used to treat heart disease and high blood pressure. The purpose of this study is to find out if these drugs interact with the anti-HIV drugs indinavir and ritonavir. The study will also look at the safety of taking the study drugs together. Heart disease and high blood pressure are major health concerns for people with HIV. Standard treatment for these illnesses often includes calcium channel blockers (CCBs). There is a potential for significant drug interactions between CCBs and HIV protease inhibitors (PIs) that may influence the dosing, monitoring, and choosing of CCBs and PIs when used in people infected with HIV. This study will examine the drug interactions between 2 commonly used CCBs and the PI combination indinavir and ritonavir (IDV/RTV). This information should help doctors choose the appropriate treatment for high blood pressure or heart disease in people taking PIs.

Condition	Treatment or Intervention	Phase
HIV Infections Cardiovascular Diseases Hypertension	Drug: Indinavir sulfate  Drug: Ritonavir  Drug: Amlodipine  Drug: Diltiazem HCl	Phase I

Further Study Details: 

Expected Total Enrollment:  32

Ischemic cardiovascular disease and hypertension occur in persons with HIV infection, and the incidence and prevalence may increase over time as the infected population ages. Standard pharmacologic interventions for these illnesses often include calcium channel blockers (CCBs). Many of the calcium channel blockers are metabolized by cytochrome P450 3A4 (CYP 3A4), which is inhibited by some protease inhibitors (PIs). Thus, there is potential for clinically significant interactions between CCBs and PIs. The presence of significant drug-drug interactions may influence the dosing, monitoring, and choosing of CCBs and/or PIs when used in persons with HIV infection. Because of the potential concomitant use of CCBs with the PI combination IDV/RTV, this study will evaluate bi-directional drug-drug interactions between 2 commonly used CCBs and IDV/RTV. This information should assist clinicians in choosing the appropriate CCBs to treat hypertension or cardiovascular disease in persons taking PIs.

Patients are randomized to 1 of the following 2 arms: Arm A: diltiazem CD interaction with IDV and RTV. Arm B: amlodipine interaction with IDV and RTV. From Days 1 to 7, patients take diltiazem CD (Arm A) or amlodipine (Arm B). Plasma is collected for PK over a 24-hour period beginning on Day 7. From Days 8 to 19, patients stop taking their assigned CCB and take IDV and RTV. Plasma is collected for PK over a 12-hour period on Day 19. From Days 20 to 26, patients continue to take IDV and RTV and add diltiazem CD (Arm A) or amlodipine (Arm B). Patients stop all 3 drugs after the last dose on Day 26. Plasma is collected for PK for a 24-hour period beginning on Day 26. Blood work, liver and kidney function tests, urinalysis, and an electrocardiogram (EKG) are performed at some visits.

Ages Eligible for Study:  18 Years   -   60 Years,  Genders Eligible for Study:  Both

Accepts Healthy Volunteers

Criteria

Inclusion Criteria

Patients may be eligible for this study if they:

• Are HIV-negative.
• Are between the ages of 18 and 60.
• Agree not to become pregnant or to impregnate and to use an acceptable form of contraception while receiving study drugs and for 1 month after stopping study drugs. Patients who are not of reproductive potential are eligible without the contraception requirement.
• Are within 30 percent of ideal body weight.
• Weigh at least 110 lbs.

Exclusion Criteria

Patients may not be eligible for this study if they:

• Have a history of any illness that requires current medical therapy.
• Have a history of any kidney disorder.
• Have any medical condition that, in the opinion of the investigator, would interfere with the study.
• Are pregnant or breast-feeding.
• Use certain drugs within 14 days prior to study entry.
• Are allergic or sensitive to study drugs.
• Use drugs or alcohol in a way which, in the opinion of the investigator, would interfere with the study.
• Have any abnormality on electrocardiogram within 21 days prior to study entry.
• Participate in any investigational drug studies within 21 days prior to study entry and during study.
• Are unable to participate in pharmacokinetic visits.
• Are unable to understand or follow the fluid intake requirement during the periods of IDV/RTV administration.

California
      Stanford Univ Med Ctr, Stanford,  California,  943055107,  United States
      Univ of California San Francisco, San Francisco,  California,  94110,  United States
Colorado
      Univ of Colorado Health Sciences Ctr, Denver,  Colorado,  80262,  United States
Maryland
      Johns Hopkins Hosp, Baltimore,  Maryland,  21287,  United States
Minnesota
      Univ of Minnesota, Minneapolis,  Minnesota,  55455,  United States
Missouri
      Washington Univ (St. Louis), St. Louis,  Missouri,  63108,  United States
New York
      Univ of Rochester Medical Center, Rochester,  New York,  14642,  United States
      Cornell Univ Med Ctr, New York,  New York,  10021,  United States
Ohio
      Univ of Cincinnati, Cincinnati,  Ohio,  452670405,  United States

Study chairs or principal investigators

Marshall Glesby,  Study Chair

Study ID Numbers:  ACTG A5159; AACTG A5159
Record last reviewed:  May 2004
Last Updated:  April 7, 2005
Record first received:  June 18, 2002
ClinicalTrials.gov Identifier:  NCT00039975
Health Authority: United States: Federal Government
ClinicalTrials.gov processed this record on 2005-04-08