Drug interactions
Mycophenolic acid + Valacyclovir
Severity: Moderate
Mycophenolic acid and Valacyclovir: moderate 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
Valacyclovir is converted to acyclovir, which competes with mycophenolate glucuronide for renal tubular secretion. Both may accumulate, particularly with reduced kidney function, raising the risk of neutropenia or neurotoxicity.
What this interaction means in plain words
Mycophenolic acid and Valacyclovir can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Mycophenolic acid belongs to Miscellaneous; Valacyclovir belongs to Anti Virals.
Why it happens
Competition between acyclovir and MPA glucuronide for renal tubular secretion.
What to do
Monitor complete blood counts and renal function. Reduce doses if cytopenias or renal impairment occur.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Mycophenolic acid
Other interactions of Valacyclovir
- Talimogene laherparepvec + Valacyclovir Major
- Bacitracin + Valacyclovir Moderate
- Cilastatin-imipenem + Valacyclovir Moderate
- Elvitegravir / cobicistat / emtricitabine / tenofovir df + Valacyclovir Moderate
- Imipenem / cilastatin / relebactam + Valacyclovir Moderate
- Imipenem / cilastatin + Valacyclovir Moderate
Frequently asked questions
Can I take Mycophenolic acid with Valacyclovir?
MediHelp rates the interaction as moderate. Mycophenolic acid and Valacyclovir can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Valacyclovir is converted to acyclovir, which competes with mycophenolate glucuronide for renal tubular secretion. Both may accumulate, particularly with reduced kidney function, raising the risk of neutropenia or neurotoxicity.
How serious is the interaction between Mycophenolic acid and Valacyclovir?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor complete blood counts and renal function. Reduce doses if cytopenias or renal impairment occur.
What other medicines interact with Mycophenolic acid?
MediHelp also lists interactions of Mycophenolic acid with, for example, Activated charcoal, Azathioprine, Cholestyramine. The full list is on the Mycophenolic acid page.
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