Ganciclovir and Valganciclovir interaction
Ganciclovir and Valganciclovir: both prescribing labels flag this combination with the strongest language, such as a contraindication, a boxed warning, or an instruction to avoid it.
Do not combine without a prescriber's guidance. The label language below is the strongest FDA uses.
What the FDA labels say
From the Valganciclovir (VALGANCICLOVIR HYDROCHLORIDE) label · effective 2026-01-06
Valganciclovir tablets are contraindicated in patients who have had a demonstrated clinically significant hypersensitivity reaction (e.g., anaphylaxis) to valganciclovir, ganciclovir, or any component of the formulation [see Adverse Reactions (6.1) ].
Hypersensitivity to valganciclovir or ganciclovir.
Table 9 Established and Other Potentially Significant Drug Interactions with Ganciclovir Name of the Concomitant Drug Change in the Concentration of Ganciclovir or Concomitant Drug Clinical Comment Imipenem-cilastatin Unknown Coadministration with imipenem-cilastatin is not recommended because generalized seizures have been reported in patients who received ganciclovir…
( 2.5 , 5.2 , 8.5 , 8.6 ) 5.1 Hematologic Toxicity Severe leukopenia, neutropenia, anemia, thrombocytopenia, pancytopenia, and bone marrow failure including aplastic anemia have been reported in patients treated with valganciclovir hydrochloride or ganciclovir.
Increased monitoring for cytopenias may be warranted if therapy with oral ganciclovir is changed to valganciclovir hydrochloride because of increased plasma concentrations of ganciclovir after valganciclovir hydrochloride administration [see Clinical Pharmacology (12.3) ] .
From the Ganciclovir label · effective 2026-01-09
Ganciclovir for Injection is contraindicated in patients who have experienced a clinically significant hypersensitivity reaction (e.g., anaphylaxis) to ganciclovir, valganciclovir, or any component of the formulation.
• Hypersensitivity to ganciclovir or valganciclovir.
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Open in the checkerNot medical advice. Interaction Checker quotes FDA label text and NIH fact sheets. Whether an interaction matters for you depends on doses, timing, kidney and liver function, and other conditions. Confirm with a pharmacist or prescriber.