- Ongoing (at least 4 weeks) stable dosage of zidovudine (ZDV) and lamivudine (3TC), ZDV and stavudine (d4T), ZDV and zalcitabine (ddC), d4T and 3TC, ZDV alone, or ddC alone, or in combination with saquinavir, ritonavir, indinavir, or nelfinavir.