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Microboosting of Atazanavir 300 mg With 50 mg Versus 100mg Ritonavir Daily in HIV-infected Patients: a Pharmacokinetic Study

Information source: Ottawa Hospital Research Institute
ClinicalTrials.gov processed this data on August 23, 2015
Link to the current ClinicalTrials.gov record.

Condition(s) targeted: HIV Infection

Intervention: atazanavir 300mg boosted with ritonavir 50 mg (Drug)

Phase: Phase 1

Status: Active, not recruiting

Sponsored by: Ottawa Hospital Research Institute

Official(s) and/or principal investigator(s):
William Cameron, MD, FRCPC, Principal Investigator, Affiliation: The Ottawa Hospital


This is an open-label, single group study to determine the pharmacokinetic profile of atazanavir 300 mg daily boosted with ritonavir 100mg daily in HIV-infected patients over a period of 9 days. Ritonavir and atazanavir are protease inhibitors used to treat HIV. However, ritonavir, when used at low doses (up to 100mg) does not have HIV activity, but will enhance (boost) the blood concentrations of other drugs like atazanavir. Recently, a study showed that taking 50mg of ritonavir administered in an oral solution led to similar blood concentrations of atazanavir than when given with 100mg of ritonavir. Potential benefits associated with a lower dose of ritonavir may include a reduction of side effects such as upset stomach and an improvement in cholesterol level. This study will look at the amount of atazanavir into your blood when given with ritonavir in a tablet formulation at 50mg or 100mg with standard atazanavir dose (300mg).

Clinical Details

Official title: Microboosting of Atazanavir 300 mg With 50 mg Versus 100 mg Ritonavir Daily in HIV-infected Patients: a Pharmacokinetic Study

Study design: Endpoint Classification: Pharmacokinetics Study, Intervention Model: Single Group Assignment, Masking: Open Label, Primary Purpose: Supportive Care

Primary outcome: Pharmacokinetics

Secondary outcome: adverse events


Minimum age: 18 Years. Maximum age: 70 Years. Gender(s): Both.


Inclusion Criteria:

- Patients meeting the following criteria will be eligible for participation in this

study: 1. Signed informed consent prior to any study-related activities. 2. Documented HIV infection. 3. Male or female patients between 18 and 70 years of age inclusively. 4. Medication history, vital signs and physical exam adequately showing no signs of acute illness at screening, as per the assessment by the physician. 5. Patients must be willing to stop using any herbal or natural health products for 4 weeks prior to and during the study including:

- Grapefruit, grapefruit juice, St. John's Wort and any others as determined

by the investigators. 6. Patients must be on an antiretroviral regimen with atazanavir/ ritonavir 300/100 mg daily as the only protease inhibitor plus any combination of nucleoside reverse transcriptase inhibitors, for at least four weeks. 7. VL<40 copies/mL on the most recent measurement, during treatment with atazanavir 300 mg daily and ritonavir 100 mg daily, which must be within 12 weeks of the study start date. 8. Reproductive Status: Definition of Women of Child-Bearing Potential (WOCBP). WOCBP comprises women who have experienced menarche and who have not undergone successful surgical sterilization (hysterectomy, bilateral tubal ligation, or bilateral oophorectomy) or who are not post-menopausal (see definition below).

- WOCBP must be using an acceptable method of contraception to avoid

pregnancy throughout the study and for up to 4 weeks after the last dose of study drug in such a manner that the risk of pregnancy is minimized.

- WOCBP must have a negative serum or urine pregnancy test result (minimum

sensitivity 25 IU/L or equivalent units of HCG) within 0 to 72 hours before the first dose of study drug.

- Women must not be breast-feeding.

- Sexually active fertile men must use effective birth control if their

partners are WOCBP Exclusion Criteria: Patients meeting one or more of the following criteria will be excluded from the study: 1. Female patients of childbearing potential who: 1. Has a positive urine pregnancy test at screening. 2. Have not been using a barrier method of contraception (such as diaphragm with spermicidal cream/jelly or condoms with spermicidal foam), for at least 3 months prior to participation in the study. 3. Is not willing or able to use a reliable method of barrier contraception during the study. 4. Is breastfeeding. 2. Patients with prior history of treatment failure on a PI based regimen, or with genotypic evidence of resistance associated mutations to protease inhibitors. 3. Use of any medication listed in Appendix I within 4 weeks prior to screening. 4. Use of any over-the-counter or prescription medications in the two weeks prior to Day 1 of the study that may interfere with absorption, distribution, metabolism or excretion of the study medications. 5. Inability to adhere to protocol. 6. Patients may be excluded from the study for other reasons, at the investigator's discretion.

Locations and Contacts

The Ottawa Hospital, Ottawa, Ontario K1H 8L6, Canada
Additional Information

Info on The Ottawa Hospital -General Campus Clinical Investigation Unit

Starting date: January 2014
Last updated: October 14, 2014

Page last updated: August 23, 2015

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