The following side effects may get better over time as your body gets used to the medication. Let your healthcare provider know immediately if you continue to experience these symptoms or if they worsen over time.
Common Side Effects
- Fever (65%)
- Nausea (47%)
- Lower red blood cell counts (33%)
- Diarrhea (30%)
- Electrolyte or creatinine levels out of balance (27%)
- Vomiting (26%)
- Headache (26%)
Less Common Side Effects
- Seizures
- Feeling tired
- Chills
- Weakness
- Dizziness
- Tinging in arms and legs
- Uncontrolled muscle movements
- Confusion
- Rash
Foscarnet serious side effects
Contact your healthcare provider immediately if you experience any of the following.
- Seizures
- Abnormal heart rhythm (QT prolongation): chest pounding, trouble breathing, chest pain, feeling faint or lightheaded
- Kidney damage: urinating less often than usual, swelling in your feet, ankles, or hands, unexplained weight gain, itchy skin
- Electrolyte changes: tingling around the mouth, numbness, prickling sensation, muscle weakness or spasms, skipping heartbeats
- Serious allergic reaction: swelling the face or throat, rash, trouble breathing
Source: DailyMed
The following Foscarnet side effects have also been reported
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 or nurse immediately if any of the following side effects occur:
More common
Increased or decreased frequency of urination or amount of urine
increased thirst
Less common
Chills
convulsions
muscle twitching
pain at the injection site
pain or numbness in hands or feet
tingling sensation around the mouth
unusual tiredness and weakness
Rare
Sores or ulcers on the mouth or throat, penis, or vulva
Incidence not known
Difficulty with breathing or swallowing
fainting
hives or welts, itching, or skin rash
irregular heartbeat recurrent
large, hive-like swelling on the face, eyelids, lips, tongue, throat, hands, legs, feet, or sex organs
reddening of the skin, especially around the ears
swelling of the eyes, face, or inside of the nose
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:
More common
Abdominal or stomach pain
anxious feeling
confusion
dizziness
headache
loss of appetite
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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