- Ribavirin. Dideoxycytidine (ddC). Dideoxyadenosine (ddA). Didanosine (ddI). Foscarnet. Dextran Sulfate. AL-721. Retrovir (Zidovudine, AZT) for greater than 4 weeks or within 90 days of study entry, or patients who originally discontinued Retrovir due to drug-related toxicity. Drugs metabolized by hepatic glucuronidation may alter the metabolism of Retrovir and should not be used chronically.