Foscarnet

80 interactions 4 explained in plain English

Also sold as: Foscavir

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS · Updated Jul 4, 2026 · Editorial policy · Data sources

Sources: FDA prescribing information (Structured Product Labeling), the published literature cited in each entry, DDInter 2.0 (a major open-access drug-interaction database), and legacy DrugBank interaction data distributed by the NIH's RxNav service (decommissioned in 2024) — analyzed and reviewed by our pharmacist team. How we build this library →

Most serious with: Arsenic Trioxide Arsenic Trioxide Injection Disopyramide Dolasetron Injection Fostemsavir Moxifloxacin Ophthalmic

2 Contraindicated 78 Major

All (80) Contraindicated (2) Major (78)

Major

Foscarnet Galantamine Razadyne Increased risk of QT interval prolongation Details Foscarnet Gatifloxacin Ophthalmic Zymar® Increased risk of QT interval prolongation Details Foscarnet Gemifloxacin Factive An increased risk of cardiotoxicity (QT prolongation, torsades de pointes, cardiac arrest) Details Foscarnet Gentamicin Injection Garamycin® I.V. Nephrotoxicity Details Foscarnet Gentamicin Ophthalmic Garamycin® Ophthalmic Nephrotoxicity Details Foscarnet Gentamicin Topical Garamycin® Nephrotoxicity Details Foscarnet Glasdegib Daurismo Increased risk of QT interval prolongation Details Foscarnet Goserelin Implant Zoladex Increased risk of QT interval prolongation Details Foscarnet Granisetron Transdermal Patch Sancuso Increased risk of QT interval prolongation Details Foscarnet Granisetron Injection Granisol Increased risk of QT interval prolongation Details Foscarnet Histrelin Implant Supprelin Increased risk of QT interval prolongation Details Foscarnet Hydroxychloroquine Plaquenil An increased risk of seizures and an increased risk of QT interval prolongation Details Foscarnet Inotuzumab Ozogamicin Injection Besponsa Increased risk of QT interval prolongation Details Foscarnet Isradipine DynaCirc® An increased risk of cardiotoxicity (QT prolongation, torsades de pointes, cardiac arrest) Details Foscarnet Ivabradine Corlanor Increased risk of QT prolongation Details Foscarnet Ketoconazole Topical Extina® Foam Increased risk of QT interval prolongation Details Foscarnet Lefamulin Xenleta Increased risk of QT interval prolongation Details Foscarnet Lenvatinib Lenvima Increased risk of QT-interval prolongation Details Foscarnet Levofloxacin Levaquin Increased risk of QT interval prolongation Details Foscarnet Levofloxacin Injection Levaquin Increased risk of QT interval prolongation Details Foscarnet Loperamide Diamode An increased risk of QT interval prolongation, which may increase risk of cardiotoxicity (torsade de pointes, cardiac arrest) Details Foscarnet Mefloquine Lariam® An increased risk of cardiotoxicity (QT prolongation, torsades de pointes, cardiac arrest) Details Foscarnet Methotrexate Jylamvo Nephrotoxicity Details Foscarnet Methotrexate Injection Abitrexate® Nephrotoxicity Details Foscarnet Metronidazole Flagyl An increased risk of QT interval prolongation Details Foscarnet Metronidazole Injection Flagyl An increased risk of QT interval prolongation Details Foscarnet Metronidazole Topical MetroCream® An increased risk of QT interval prolongation Details Foscarnet Metronidazole Vaginal MetroGel® Vaginal An increased risk of QT interval prolongation Details Foscarnet Moxifloxacin Avelox Increased risk of QT interval prolongation Details Foscarnet Moxifloxacin Injection Avelox Increased risk of QT interval prolongation Details Foscarnet Moxifloxacin Ophthalmic Moxeza® Increased risk of QT interval prolongation Details Foscarnet Octreotide Bynfezia An increased risk of cardiotoxicity (QT prolongation, torsades de pointes, cardiac arrest) Details Foscarnet Octreotide Injection Bynfezia An increased risk of cardiotoxicity (QT prolongation, torsades de pointes, cardiac arrest) Details Foscarnet Ofloxacin Floxin® Increased risk of QT interval prolongation Details Foscarnet Ofloxacin Ophthalmic Ocuflox Increased risk of QT interval prolongation Details Foscarnet Ofloxacin Otic Floxin® Otic Increased risk of QT interval prolongation Details Foscarnet Olodaterol Oral Inhalation Striverdi An increased risk of QT interval prolongation and an increased risk of ventricular arrhythmias Details Foscarnet Oxaliplatin Injection Eloxatin® Increased risk of QT-interval prolongation Details

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Educational information only, not medical advice. Always confirm interactions with your pharmacist or prescriber before making any change to your medications.