A Phase I Study of a Fixed-Schedule Regimen of Alternating Oral and Intravenous Ganciclovir for Treatment of Cytomegalovirus Retinitis

A systemic treatment strategy for CMV retinitis is needed that will be effective yet convenient to administer, without the need for a permanent indwelling IV catheter. Although oral ganciclovir has been used as maintenance following induction with IV ganciclovir, patients with reactivation of disease must be reinduced IV. A fixed-schedule regimen in which oral and IV ganciclovir are alternated may prevent reactivation and progression of disease, as opposed to the current therapeutic strategy in which changes in therapy are event-driven. Also, the duration of intermittent IV therapy required to control disease may be short enough to eliminate the need for an indwelling catheter.

Patients receive IV induction with ganciclovir for 2 weeks followed by an alternating course of 3 weeks of oral ganciclovir and 1 week of IV drug for four cycles (16 weeks). If CMV retinitis fails to arrest after initial induction, IV ganciclovir is administered for an additional 2 weeks.