Drug interactions
Talimogene laherparepvec + Valacyclovir
Severity: Major
Talimogene laherparepvec and Valacyclovir: 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
Talimogene laherparepvec is a live attenuated herpes simplex virus that must replicate to be effective. Antiherpetic antivirals may suppress its replication and reduce efficacy.
What this interaction means in plain words
Talimogene laherparepvec and Valacyclovir 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.
Talimogene laherparepvec belongs to Oncology; Valacyclovir belongs to Anti Virals.
Why it happens
Valacyclovir's active form acyclovir inhibits herpes viral DNA polymerase, which may block replication of the oncolytic virus.
What to do
Avoid antiherpetic agents during talimogene therapy unless needed to treat herpetic infection. Review the need for valacyclovir before each treatment.
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 Valacyclovir
- Bacitracin + Valacyclovir Moderate
- Cilastatin-imipenem + Valacyclovir Moderate
- Elvitegravir / cobicistat / emtricitabine / tenofovir df + Valacyclovir Moderate
- Imipenem / cilastatin / relebactam + Valacyclovir Moderate
- Imipenem / cilastatin + Valacyclovir Moderate
- Mycophenolic acid + Valacyclovir Moderate
Other interactions of Talimogene laherparepvec
Frequently asked questions
Can I take Talimogene laherparepvec with Valacyclovir?
MediHelp rates the interaction as major. Talimogene laherparepvec and Valacyclovir 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. Talimogene laherparepvec is a live attenuated herpes simplex virus that must replicate to be effective. Antiherpetic antivirals may suppress its replication and reduce efficacy.
How serious is the interaction between Talimogene laherparepvec and Valacyclovir?
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 antiherpetic agents during talimogene therapy unless needed to treat herpetic infection. Review the need for valacyclovir before each treatment.
What other medicines interact with Valacyclovir?
MediHelp also lists interactions of Valacyclovir with, for example, Bacitracin, Cilastatin-imipenem, Elvitegravir / cobicistat / emtricitabine / tenofovir df. The full list is on the Valacyclovir page.
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