Pharmacokinetic Study of Super-boosted Lopinavir/Ritonavir Given With Rifampin

The object of this study is to evaluate the pharmacokinetic interactions, short term safety and efficacy of standard dose lopinavir/ritonavir 200mg/50 (two tablets twice daily) given with ritonavir 100 mg three tablets twice daily given in combination with rifampin in HIV-infected persons with tuberculosis

This will be an open label non-randomized pharmacokinetic study of 10-12 HIV-infected patients co-infected with Mycobacterium tuberculosis.

Enrollment: Potential subjects with active tuberculosis who have tolerated a rifampin containing regimen for at least 2 weeks. Potential subjects will be referred from the surrounding communities to Laboratorio de Pesquisa Clinica em Micobacterioses(LAPCLINTB)

Visit 1: Subjects will then be started on lopinavir/ritonavir containing HAART regimen with standard twice daily dosing. Ritonavir 100 mg capsules will be added to the regimen and the dose escalated until the patient is taking 3 capsules twice daily. The time between enrollment and visit 1 will be determined by the treating physician.

Visit 2: They will return about 1 week after dose escalation has been completed to sample lopinavir and rifampin concentrations.

Visit 3: Subject will return in 2 weeks to have repeat to review results of lopinavir concentrations and response to therapy. Ritonavir will be adjusted as needed.

Visit 4: Subject will then return in 4 weeks for last visit for evaluation. Lopinavir and rifampin PK will be done.