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Foscarnet (fos KAR net)

Adult Medication

Brand Names: U.S.

Foscavir

Brand Names: Canada

Foscavir®

Warning

  • Kidney problems have happened with this drug. The doctor will give fluids in a vein to lower the chance of kidney problems. Talk with the doctor.
  • Have your blood work checked often. Talk with your doctor.
  • This drug may cause seizures in some patients. Talk with the doctor.
  • This drug is only approved for use in people with a weak immune system. It is used to treat eye problems caused by cytomegalovirus (CMV). It is also used to treat a type of herpes infection that cannot be treated by another drug. Talk with the doctor.

What is this drug used for?

  • It is used to treat a type of herpes infection that cannot be treated by another drug.
  • It is used to treat a viral infection of the eyes in people who have AIDS.
  • It may be given to you for other reasons. Talk with the doctor.

What do I need to tell my doctor BEFORE I take this drug?

  • If you have an allergy to foscarnet or any other part of this drug.
  • If you are allergic to any drugs like this one, any other drugs, foods, or other substances. Tell your doctor about the allergy and what signs you had, like rash; hives; itching; shortness of breath; wheezing; cough; swelling of face, lips, tongue, or throat; or any other signs.
  • If you have heart problems.
  • If you are on a low-salt or salt-free diet.
  • If you are on dialysis, talk with your doctor.
This is not a list of all drugs or health problems that interact with this drug.
Tell your doctor and pharmacist about all of your drugs (prescription or OTC, natural products, vitamins) and health problems. You must check to make sure that it is safe for you to take this drug with all of your drugs and health problems. Do not start, stop, or change the dose of any drug without checking with your doctor.

What are some things I need to know or do while I take this drug?

  • Tell dentists, surgeons, and other doctors that you use this drug.
  • Avoid driving and doing other tasks or actions that call for you to be alert until you see how this drug affects you.
  • If you have seizures, dizziness, or feel sleepy while using this drug, avoid driving and doing other tasks or actions that call for you to be alert. Talk with your doctor.
  • Have an eye exam as you have been told by your doctor.
  • This drug is not a cure for cytomegalovirus (CMV) infection. Stay under the care of your doctor.
  • This drug is not a cure for herpes infections. Talk with the doctor.
  • Seizures have happened with this drug. Sometimes, deaths have happened with seizures. Talk with the doctor.
  • Use with care in children. Talk with the doctor.
  • If you are 65 or older, use this drug with care. You could have more side effects.
  • Tell your doctor if you are pregnant or plan on getting pregnant. You will need to talk about the benefits and risks of using this drug while you are pregnant.
  • Tell your doctor if you are breast-feeding. You will need to talk about any risks to your baby.

For patients with HIV:

  • Do not breast-feed if you have HIV disease unless your doctor tells you to.

What are some side effects that I need to call my doctor about right away?

WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:
  • Signs of an allergic reaction, like rash; hives; itching; red, swollen, blistered, or peeling skin with or without fever; wheezing; tightness in the chest or throat; trouble breathing or talking; unusual hoarseness; or swelling of the mouth, face, lips, tongue, or throat.
  • Signs of infection. These include a fever of 100.4°F (38°C) or higher, chills, very bad sore throat, ear or sinus pain, cough, more sputum or change in color of sputum, pain with passing urine, mouth sores, wound that will not heal, or anal itching or pain.
  • Signs of fluid and electrolyte problems like mood changes, confusion, muscle pain or weakness, a heartbeat that does not feel normal, very bad dizziness or passing out, fast heartbeat, more thirst, seizures, feeling very tired or weak, not hungry, unable to pass urine or change in the amount of urine produced, dry mouth, dry eyes, or very bad upset stomach or throwing up.
  • Signs of kidney problems like unable to pass urine, change in the amount of urine passed, blood in the urine, or a big weight gain.
  • A burning, numbness, or tingling feeling that is not normal.
  • Trouble controlling body movements.
  • Low mood (depression).
  • Shortness of breath.
  • Muscle stiffness.
  • Change in eyesight.
  • Genital irritation.
  • Feeling very tired or weak.
  • This drug may irritate the vein. It may burn the skin if the drug leaks from the vein when it is given. Tell your nurse if you have any redness, burning, pain, swelling, or leaking of fluid where the drug is going into your body.

What are some other side effects of this drug?

All drugs may cause side effects. However, many people have no side effects or only have minor side effects. Call your doctor or get medical help if any of these side effects or any other side effects bother you or do not go away:
  • Anxiety.
  • Loose stools (diarrhea).
  • Headache.
  • Upset stomach or throwing up.
  • Feeling tired or weak.
  • Dizziness.
  • Not hungry.
  • Belly pain.
  • Sweating a lot.
These are not all of the side effects that may occur. If you have questions about side effects, call your doctor. Call your doctor for medical advice about side effects.
You may report side effects to your national health agency.

How is this drug best taken?

Use this drug as ordered by your doctor. Read and follow the dosing on the label closely.
  • It is given as an infusion into a vein over a period of time.
  • Drink lots of noncaffeine liquids unless told to drink less liquid by your doctor.

What do I do if I miss a dose?

  • Call the doctor to find out what to do.

How do I store and/or throw out this drug?

  • This drug will be given to you in a hospital or doctor’s office. You will not store it at home.

General drug facts

  • If your symptoms or health problems do not get better or if they become worse, call your doctor.
  • Do not share your drugs with others and do not take anyone else’s drugs.
  • Keep a list of all your drugs (prescription, natural products, vitamins, OTC) with you. Give this list to your doctor.
  • Talk with the doctor before starting any new drug, including prescription or OTC, natural products, or vitamins.
  • Keep all drugs out of the reach of children and pets.
  • Check with your pharmacist about how to throw out unused drugs.
  • Some drugs may have another patient information leaflet. If you have any questions about this drug, please talk with your doctor, pharmacist, or other health care provider.
  • If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.

Consumer Information Use and Disclaimer

This information should not be used to decide whether or not to take this medicine or any other medicine. Only the healthcare provider has the knowledge and training to decide which medicines are right for a specific patient. This information does not endorse any medicine as safe, effective, or approved for treating any patient or health condition. This is only a brief summary of general information about this medicine. It does NOT include all information about the possible uses, directions, warnings, precautions, interactions, adverse effects, or risks that may apply to this medicine. This information is not specific medical advice and does not replace information you receive from the healthcare provider. You must talk with the healthcare provider for complete information about the risks and benefits of using this medicine.

Copyright

Copyright © 2014 Clinical Drug Information, LLC and Lexi-Comp, Inc.