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 Amitriptyline Elavil Explained An increased risk of cardiotoxicity (QT prolongation, torsades de pointes, cardiac arrest) Details Foscarnet Sertraline Explained An increased risk of QT interval prolongation Details Foscarnet Buprenorphine Belbuca Explained An increased risk of QT interval prolongation Details Foscarnet Relugolix Orgovyx Explained Increased risk of QT interval prolongation Details Foscarnet Acyclovir Avaclyr Nephrotoxicity Details Foscarnet Acyclovir Injection Avaclyr Nephrotoxicity Details Foscarnet Acyclovir Ophthalmic Avaclyr Nephrotoxicity Details Foscarnet Acyclovir Topical Zovirax Nephrotoxicity Details Foscarnet Amikacin Injection Amikin® Nephrotoxicity Details Foscarnet Amikacin Oral Inhalation Arikayce Nephrotoxicity Details Foscarnet Amisulpride Injection Barhemsys Increased risk of serious ventricular arrhythmias such as torsades de pointes Details Foscarnet Aripiprazole Injection Abilify An increased risk of QT interval prolongation Details Foscarnet Asenapine Transdermal Patch Secuado Increased risk of QT interval prolongation Details Foscarnet Aspirin Acuprin® Increased aspirin exposure and an increased risk of nephrotoxicity Details Foscarnet Aspirin Rectal Aspirin Increased aspirin exposure and an increased risk of nephrotoxicity Details Foscarnet Azithromycin AzaSite Increased risk of QT interval prolongation Details Foscarnet Alfuzosin UroXatral Increased risk of QT interval prolongation Details Foscarnet Amphotericin B Injection Abelcet Nephrotoxicity Details Foscarnet Anagrelide Agrylin Increased risk of QT interval prolongation Details Foscarnet Bedaquiline Sirturo Increased risk of QT interval prolongation Details Foscarnet Chloroquine Aralen® An increased risk of cardiotoxicity (QT prolongation, torsades de pointes, cardiac arrest) Details Foscarnet Cidofovir Injection Vistide® Nephrotoxicity Details Foscarnet Cyclosporine Injection Atopica Nephrotoxicity Details Foscarnet Cyclosporine Ophthalmic Cequa Nephrotoxicity Details Foscarnet Dasatinib Phyrago Increased risk of QT interval prolongation Details Foscarnet Degarelix Injection Firmagon Increased risk of QT interval prolongation Details Foscarnet Deutetrabenazine Austedo An increased risk of QT interval prolongation Details Foscarnet Disopyramide Norpace An increased risk of cardiotoxicity (QT prolongation, torsades de pointes, cardiac arrest) Details Foscarnet Dofetilide Tikosyn An increased risk of cardiotoxicity (QT prolongation, torsades de pointes, cardiac arrest) Details Foscarnet Dolasetron Anzemet An increased risk of cardiotoxicity (QT prolongation, torsades de pointes, cardiac arrest) Details Foscarnet Dolasetron Injection Anzemet An increased risk of cardiotoxicity (QT prolongation, torsades de pointes, cardiac arrest) Details Foscarnet Encorafenib Braftovi Increased risk of QT interval prolongation Details Foscarnet Entrectinib Rozlytrek An increased risk of QT interval prolongation Details Foscarnet Eribulin Injection Halaven Increased risk of QT interval prolongation Details Foscarnet Famotidine Calmicid Increased risk of QT interval prolongation Details Foscarnet Famotidine Injection Calmicid Increased risk of QT interval prolongation Details Foscarnet Felbamate Felbatol Increased risk of QT interval prolongation Details Foscarnet Flecainide Tambocor® An increased risk of cardiotoxicity (QT prolongation, torsades de pointes, cardiac arrest) Details Foscarnet Fostemsavir Rukobia Increased risk of torsade de pointes Details Foscarnet Furosemide Injection Disal Impaired foscarnet elimination and potential for toxicity 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.