Foscarnet (Intravenous Route)

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Side Effects

Along with their needed effects, medicines like foscarnet can sometimes cause serious side effects such as kidney problems; these are described below. Foscarnet may also decrease the amount of calcium in your blood, causing you to have a tingling sensation around your mouth, and pain or numbness in your hands and feet. If this occurs, especially while you are receiving the medicine, notify your health care professional immediately.

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur:

• Increased or decreased frequency of urination or amount of urine
• Increased thirst

• Convulsions (seizures)
• Fever, chills, and sore throat
• Muscle twitching
• Pain at place of injection
• Pain or numbness in hands or feet
• Tingling sensation around mouth
• Tremor
• Unusual tiredness and weakness

• Sores or ulcers on the mouth or throat, penis, or vulva

Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

• Abdominal or stomach pain
• Anxious feeling
• Confusion
• Dizziness
• Headache
• Loss of appetite
• Nausea and vomiting
• Unusual tiredness or weakness

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.

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