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Side Effects Valacyclovir

Side Effects Valacyclovir


Valacyclovir is used to treat infections caused by certain types of viruses. In children, it is used to treat cold sores around the mouth (caused by herpes simplex) and chickenpox (caused by varicella zoster). In adults, it is used to treat shingles (caused by herpes zoster) and cold sores around the mouth.

Valacyclovir is also used to treat outbreaks of genital herpes. In people with frequent outbreaks, this medication is used to reduce the number of future episodes.

Side effects of Valtrex include:

  • headache
  • dizziness
  • tired feeling
  • depression
  • nausea
  • vomiting
  • stomach pain
  • joint pain
  • menstrual pain
  • skin rash
  • stuffy nose
  • or sore throat

How should I take valacyclovir (Valtrex)?

Follow all directions on your prescription label. Do not take this medicine in larger or smaller amounts or for longer than recommended.

Start taking valacyclovir as soon as possible after the first appearance of symptoms (such as tingling, burning, blisters). This medicine might not be as effective if you first start taking it 1 or 2 days after the start of your symptoms.

What is the dosage for Valtrex (valacyclovir)?

Valtrex may be taken with or without food.

In people with kidney disease, doses need to be reduced.

For the treatment of herpes zoster (shingles), the usual dose is 1 gm. three times a day for 7 days. Treatment should begin at the first symptom and is most effective if started within 48 hours of the onset of rash.

The dose for chickenpox is 20 mg/kg 3 times daily for 5 days (maximum dose is 1000 mg 3 times daily) and treatment should start at the earliest sign or symptom.

Which drugs or supplements interact with Valtrex (valacyclovir)?

Probenecid (Benemid) and cimetidine (Tagamet) may reduce the kidney's clearance of Valtrex, leading to higher concentrations in the blood. This may lead to side effects of Valtrex.

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