Database of Antiretroviral Drug Interactions (Regularly Updated)
Search through this comprehensive, fully-referenced database of interactions involving at least one antiretroviral drug.
From HIV InSite
Drug Interaction Checker (Regularly Updated)
Free registration required in order to view.
From Medscape
HIV-druginteractions.org: Online Resource on Drug Interactions (Regularly Updated)
Maintained by the University of Liverpool and geared toward healthcare professionals; features interactive charts for assessing the risks of interaction between protease inhibitors, NNRTIs and other drugs.
From University of Liverpool