Imipenem and Ganciclovir: Interaction Details
AI-assisted, pharmacist-reviewed · Source data updated Aug 8, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Ganciclovir
Imipenem
No brand names on record
How we grade severity & evidence
Severity levels
- Contraindicated: These should generally not be used together.
- Major: Potentially serious — often needs a change or close monitoring.
- Moderate: Can be significant — usually manageable with monitoring.
- Minor: Usually limited clinical impact.
Evidence grades
- Established: Well documented — supported by controlled studies or strong clinical data.
- Probable: Good supporting evidence, though not definitively proven.
- Suspected: Some evidence suggests this interaction, but it is not well established.
- Possible: Limited or conflicting evidence; the interaction may occur.
- Theoretical: Predicted from the drugs' pharmacology; not yet confirmed in people.
Ratings come from the documented interaction literature and are reviewed by a pharmacist. They describe the documented risk of the combination, not what will necessarily happen to you — your dose, timing, and health picture all matter.
What happens
CNS toxicity (seizures)
Interaction Deep Dive
Generalized seizures have been reported in six patients given imipenem/cilastatin concurrently with ganciclovir3. Coadministration of imipenem with valganciclovir, a prodrug of ganciclovir 2, may result in a similar effect. It may be advisable to avoid coadministration of imipenem/cilastatin and valganciclovir unless the potential benefit of therapy outweighs the risk 1.
Why it happens (mechanism)
Unknown
Common questions
Can I take Imipenem and Ganciclovir together?
CNS toxicity (seizures) Always confirm with your pharmacist or prescriber before making any change.
How serious is the Imipenem and Ganciclovir interaction?
It is rated major. Potentially serious — often needs a change or close monitoring.
How quickly could this interaction happen?
The documented onset is "rapid". Effects can appear quickly, often within about 24 hours of combining the drugs.
How strong is the evidence for this interaction?
The evidence is graded "probable". Good supporting evidence, though not definitively proven.
Questions for your pharmacist
- Does my dose of Imipenem or Ganciclovir need adjusting while I take them together?
- What symptoms should prompt me to call you or my prescriber right away?
- Does the timing of my doses matter for this combination?
- Is there a safer alternative to one of these medications for me?
References (3)
- Product Information: CYTOVENE-IV(R) IV injection, ganciclovir sodium IV injection. Roche Laboratories Inc, Nutley, NJ, 2008.
- Product Information: VALCYTE(R) oral solution, oral tablets, valganciclovir hydrochloride oral solution, oral tablets. Genentech USA, Inc, South San Francisco, CA, 2010. DailyMed
- Faulds D & Heel RC: Ganciclovir: a review of its antiviral activity, pharmacokinetic properties and therapeutic efficacy in cytomegalovirus infections. Drugs 1990; 39:597-638.
Keep reading about Ganciclovir
Keep reading about Imipenem
These medications also interact with supplements
Prescription drugs aren't the whole picture — herbal and dietary supplements can interact with them too. From the evidence-graded Natural Medicines database:
major · moderate · minor — check everything you take with our drug–supplement interaction checker.
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