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Foscavir Patient Information including How Should I Take

What should I discuss with my health care provider before using foscarnet (Foscavir)?

You should not use this medication if you are allergic to foscarnet.

If you have any of these other conditions, you may need a dose adjustment or special tests to safely use this medication:

  • kidney disease;
  • epilepsy or other seizure disorder;
  • a history of head injury or brain tumor;
  • heart disease;
  • a nerve disorder;
  • low levels of calcium, magnesium, or potassium in your blood; or
  • any other type of electrolyte imbalance.

FDA pregnancy category C. It is not known whether foscarnet is harmful to an unborn baby. Before taking this medication, tell your doctor if you are pregnant or plan to become pregnant during treatment.

It is not known whether foscarnet passes into breast milk or if it could harm a nursing baby. Do not use this medication without telling your doctor if you are breast-feeding a baby.

How is foscarnet given (Foscavir)?

Foscarnet is given as an injection through a needle placed into a vein. The medicine must be given slowly through an IV infusion pump, and can take up to 2 hours to complete.

You may be given instructions on how to inject your medicine at home. Do not use this medicine at home if you do not fully understand how to give the injection and properly dispose of needles and other items used in giving the medicine.

With each foscarnet injection, you may be given IV fluids to keep you from getting dehydrated.

Foscarnet is usually given for 2 to 3 weeks. Your doctor may occasionally change your dose to make sure you get the best results from this medication.

You may need to mix foscarnet with a liquid (diluent) before using it. If you are using the injections at home, be sure you understand how to properly mix and store the medication. Do not give foscarnet with other medications in the same IV line.

Foscarnet should be clear and colorless. Do not use the medication if it has changed colors or has any particles in it. Call your doctor for a new prescription.

To be sure this medication is not causing harmful effects, your blood will need to be tested on a regular basis. Your kidney function may also need to be tested, and you may also need regular eye exams. Do not miss any scheduled visits to your doctor.

Store foscarnet at room temperature away from very hot or very cold temperature.

Side Effects Centers

Report Problems to the Food and Drug Administration


You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

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