AUC for zidovudin øges, og der ses et tilsvarende fald i clearance af zidovudin, når valproinsyre, fluconazol eller metadon administreres samtidig med zidovudin.
Valproic acid, fluconazole or methadone when co-administered with zidovudine have been shown to increase the AUC of zidovudine, with a corresponding decrease in its clearance.