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Modification of Doses of Efavirenz According to Its Blood Concentration in HIV Patients

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ClinicalTrials.gov Identifier: NCT00299091
Recruitment Status : Completed
First Posted : March 6, 2006
Last Update Posted : September 16, 2016
Information provided by (Responsible Party):

Study Description
Brief Summary:
This is a study on the utility of the modification of doses of efavirenz guided by its plasma concentration (therapeutic drug monitoring) in HIV-infected patients initiating treatment with Sustiva.

Condition or disease Intervention/treatment Phase
HIV Drug: Efavirenz capsules 200 mg and 600 mg Phase 4

Detailed Description:

Currently, efavirenz is dosed systematically, without taking into account the individual characteristics of each individual patient. However, plasma concentration of efavirenz may widely vary between different subjects that receive the same dose of the drug (interindividual variability).

Therapeutic drug monitoring (TDM) signifies individualised pharmacological dosing, based on the plasma levels that each patient presents. This strategy has been broadly used in the field of the treatment of other medical conditions and is acquiring growing interest in the field of antiretroviral treatment. Thus, the use of TDM for the treatment of naïve patients with nelfinavir or with indinavir has translated into an increase in the proportion of individuals with suppressed viral load and also into a reduction in HAART-induced adverse events . However, data on the utility of the therapeutic monitoring of the levels of efavirenz in HIV-infected patients are very scant.

On the basis of the above, it might be thought that the modification of the doses of efavirenz, guided by its plasma concentration, in patients receiving this drug and whose plasma levels of efavirenz are outside the therapeutic range, might improve the tolerability of the treatment without compromising virological efficacy.

Study Design

Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 31 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: Open, Parallel and Randomised Pilot Clinical Trial to Evaluate the Utility of the Therapeutic Monitoring of Plasma Levels of Efavirenz in Hiv-Infected Patients Initiating an Antiretroviral Treatment Regimen With Sustiva
Study Start Date : September 2006
Primary Completion Date : October 2008
Study Completion Date : October 2008

Resource links provided by the National Library of Medicine

MedlinePlus related topics: HIV/AIDS
Drug Information available for: Efavirenz
U.S. FDA Resources

Arms and Interventions

Arm Intervention/treatment
No Intervention: Control
Efavirenz capsules 600 mg
Experimental: Experimental
Modification of doses of efavirenz guided by its plasma concentration (therapeutic drug monitoring)
Drug: Efavirenz capsules 200 mg and 600 mg
Modification of doses of efavirenz guided by its plasma concentration (therapeutic drug monitoring)
Other Name: Sustiva

Outcome Measures

Primary Outcome Measures :
  1. The proportion of patients who need to interrupt treatment with efavirenz due to virological failure [ Time Frame: after 96 weeks of follow-up ]

Secondary Outcome Measures :
  1. The proportion of patients who need to interrupt treatment with efavirenz due to adverse side effects [ Time Frame: after 96 weeks of follow-up ]
  2. To determine the incidence of adverse events and the toxicity profile (haemogram, AST/ALT/FA/GGT, creatinine, urea) [ Time Frame: during the 96 weeks of follow-up ]
  3. To evaluate the proportion of patients with plasma levels of efavirenz between 1.0 and 4.0 mg/L [ Time Frame: during the 96 weeks of follow-up ]
  4. To evaluate the relationship between the appearance of secondary events during treatment with efavirenz and the patients' demographic and clinical characteristics, as well the plasma concentration of efavirenz [ Time Frame: during the 96 weeks of follow-up ]
  5. To evaluate the variations in CD4 and CD8 lymphocyte count [ Time Frame: during the 96 weeks of follow-up ]

Eligibility Criteria

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Ages Eligible for Study:   18 Years to 65 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • HIV-1 patients.
  • According to the criteria of the treating physician, the need to initiate a regimen of antiretroviral treatment that includes efavirenz (both antiretroviral-naive patients and others on treatment with protease inhibitors switching to efavirenz for salvage reasons or for simplification of the anti-retroviral therapy are included).
  • Absence of opportunistic infections and/or tumours in the three months prior to inclusion.

Exclusion Criteria:

  • History of allergic hypersensitivity to the investigational drug.
  • History of previous failure with antiretroviral treatment with non-nucleoside reverse transcriptase inhibitors or previously documented resistance to efavirenz
  • History of psychiatric comorbidity which, in the investigator's opinion, renders the use of efavirenz inadvisable.
  • Active consumption of alcohol (>50 g/day) or other illegal drugs (except cannabis)
  • Suspicion of unsuitable compliance with the antiretroviral treatment.
  • Pregnant women or breast-feeding mothers.
Contacts and Locations

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00299091

Germans Trias i Pujol Hospital
Badalona, Barcelona, Spain, 08916
Sponsors and Collaborators
Principal Investigator: Bonaventura Clotet, MD, PhD Lluita Sida Foundation-HIV Unit
More Information

Responsible Party: Dr . BONAVENTURA CLOTET, Dr. Bonaventura Clotet, Germans Trias i Pujol Hospital
ClinicalTrials.gov Identifier: NCT00299091     History of Changes
Other Study ID Numbers: startTDM-EFV
First Posted: March 6, 2006    Key Record Dates
Last Update Posted: September 16, 2016
Last Verified: October 2008

Keywords provided by Dr . BONAVENTURA CLOTET, Germans Trias i Pujol Hospital:
Therapeutic drug monitoring
Treatment Naive
Treatment Experienced

Additional relevant MeSH terms:
Reverse Transcriptase Inhibitors
Nucleic Acid Synthesis Inhibitors
Enzyme Inhibitors
Molecular Mechanisms of Pharmacological Action
Anti-Retroviral Agents
Antiviral Agents
Anti-Infective Agents
Cytochrome P-450 CYP2C9 Inhibitors
Cytochrome P-450 Enzyme Inhibitors
Cytochrome P-450 CYP2C19 Inhibitors
Cytochrome P-450 CYP2B6 Inducers
Cytochrome P-450 Enzyme Inducers
Cytochrome P-450 CYP3A Inducers