Drug interactions
Tolfenamic acid + Valganciclovir
Severity: Minor
Tolfenamic acid and Valganciclovir: minor interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Tolfenamic acid is an acidic NSAID that may compete with ganciclovir, the active form of valganciclovir, for renal tubular secretion. This could modestly raise ganciclovir exposure, but the clinical significance is uncertain. NSAIDs can also reduce renal function, which would further limit ganciclovir clearance.
What this interaction means in plain words
Tolfenamic acid and Valganciclovir have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Tolfenamic acid belongs to Musculoskeletal; Valganciclovir belongs to Anti Virals.
Why it happens
Possible competition for renal tubular anionic secretion plus NSAID-related reduction in renal perfusion, decreasing ganciclovir clearance.
What to do
Monitor renal function and signs of ganciclovir toxicity such as cytopenias, and adjust the valganciclovir dose to creatinine clearance if renal function declines.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Valganciclovir
Other interactions of Tolfenamic acid
Frequently asked questions
Can I take Tolfenamic acid with Valganciclovir?
MediHelp rates the interaction as minor. Tolfenamic acid and Valganciclovir have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Tolfenamic acid is an acidic NSAID that may compete with ganciclovir, the active form of valganciclovir, for renal tubular secretion. This could modestly raise ganciclovir exposure, but the clinical significance is uncertain. NSAIDs can also reduce renal function, which would further limit ganciclovir clearance.
How serious is the interaction between Tolfenamic acid and Valganciclovir?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor renal function and signs of ganciclovir toxicity such as cytopenias, and adjust the valganciclovir dose to creatinine clearance if renal function declines.
What other medicines interact with Valganciclovir?
MediHelp also lists interactions of Valganciclovir with, for example, Didanosine, Ganciclovir, Liposomal doxorubicin. The full list is on the Valganciclovir page.
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