Interactions between ganciclovir and Benemid (probenecid)
probenecid and ganciclovir (Moderate Drug-Drug)
MONITOR: The coadministration of probenecid and ganciclovir may result in elevated plasma concentrations of ganciclovir. In 10 subjects with HIV infection, probenecid (500 mg orally every 6 hours) increased the peak plasma concentration and area under the concentration-time curve of ganciclovir (1 gram orally every 8 hours) by an average of 40% and 53%, respectively. Renal clearance decreased an average of 22%. The mechanism of the interaction is competitive inhibition of ganciclovir renal tubular secretion by probenecid.
MANAGEMENT: Caution is advised if ganciclovir or its prodrug, valganciclovir, must be used concomitantly with probenecid. Close monitoring for toxicities associated with ganciclovir such as myelosuppression is recommended during concurrent therapy.
