Drug interactions
Probenecid + Valganciclovir
Severity: Major
Probenecid and Valganciclovir: major 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
Probenecid decreases the renal clearance of ganciclovir, the active form of valganciclovir, and increases systemic exposure. This raises the risk of ganciclovir toxicity, notably myelosuppression and neurotoxicity including seizures.
What this interaction means in plain words
Probenecid and Valganciclovir can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Probenecid belongs to Genitourinary; Valganciclovir belongs to Anti Virals.
Why it happens
Probenecid inhibits renal tubular secretion of ganciclovir via organic anion transporters.
What to do
Avoid the combination where possible; if used, monitor complete blood counts and neurologic status and consider reducing the valganciclovir dose.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Probenecid
- Ketorolac intranasal + Probenecid Contraindicated
- Ketorolac + Probenecid Contraindicated
- Baricitinib + Probenecid Major
- Ceftazidime / avibactam + Probenecid Major
- Methotrexate + Probenecid Major
- Pralatrexate + Probenecid Major
Other interactions of Valganciclovir
Frequently asked questions
Can I take Probenecid with Valganciclovir?
MediHelp rates the interaction as major. Probenecid and Valganciclovir can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Probenecid decreases the renal clearance of ganciclovir, the active form of valganciclovir, and increases systemic exposure. This raises the risk of ganciclovir toxicity, notably myelosuppression and neurotoxicity including seizures.
How serious is the interaction between Probenecid and Valganciclovir?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid the combination where possible; if used, monitor complete blood counts and neurologic status and consider reducing the valganciclovir dose.
What other medicines interact with Probenecid?
MediHelp also lists interactions of Probenecid with, for example, Ketorolac intranasal, Ketorolac, Baricitinib. The full list is on the Probenecid page.
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