Does Cidofovir Anhydrous Interact with Foscarnet?
CDI records a contraindicated classification for Cidofovir Anhydrous and Foscarnet. The stored summary is: Concomitant administration of cidofovir and foscarnet is contraindicated due to nephrotoxic potential. Must be discontinued at least 7 days prior to cidofovir therapy. The mechanism involves additive nephrotoxicity. Patients taking both medications should consult their healthcare provider before starting, stopping, or changing the dosage of either drug. This record was extracted from drug labeling through openFDA. NIH/NLM RxNorm is used for drug identities. The summary and severity classification are CDI's processed information, not a verbatim source quotation. Product, route, and patient circumstances matter.
- Severity
- Contraindicated
- Management
- Do not take together
- Data Source
- U.S. FDA via OpenFDA
Recorded Mechanism
Additive nephrotoxicity
What To Tell Your Doctor or Pharmacist
If you are taking Cidofovir Anhydrous and your doctor is considering prescribing Foscarnet (or vice versa), make sure to:
- Inform your doctor and pharmacist of all current medications, including over-the-counter drugs and supplements
- Ask whether the benefits of combining these medications outweigh the risks for your specific situation
- Ask what symptoms to watch for that would indicate the interaction is causing problems
- Ask about alternative medications that do not interact with your current regimen
- Ask how frequently you should be monitored while these are co-prescribed
- Never stop or change either medication without first consulting your healthcare provider