Valtrex

Generic name: Valacyclovir hydrochloride

Why is Valtrex prescribed?

Valtrex is used to treat certain herpes infections, including herpes zoster (the painful rash known as shingles), genital herpes, and herpes cold sores on the face and lips.

Most important fact about Valtrex

Valtrex should not be used by anyone with a weak immune system, such as those with HIV infection or those who have undergone a bone marrow or kidney transplant. Valtrex can cause serious side effects, including death, in such people.

How should you take Valtrex?

If you are taking Valtrex for shingles, you should start using it as soon as possible after your doctor has made a diagnosis. It's best to see a doctor and start the drug within 48 hours of first noticing the rash. If you wait more than 72 hours after you first get a herpes zoster rash, the medication may not be effective.

If you are using Valtrex for genital herpes, begin taking it at the first sign of an attack. The medication may not be effective if you wait longer than 72 hours after the first attack or 24 hours after a later attack.

If you are taking Valtrex for cold sores, you should start using it at the earliest signs of infection, such as tingling, itching, or burning. If you wait until the cold sore develops, the medication might not work.

You may take Valtrex with or without food.

• If you miss a dose...
  Take it as soon as you remember. If it is almost time for your next dose, skip the one you missed and go back to your regular schedule. Do not take 2 doses at the same time.

• Storage instructions...
  Store at room temperature.

What side effects may occur?

Side effects cannot be anticipated. If any develop or change in intensity, inform your doctor as soon as possible. Only your doctor can determine if it is safe for you to continue using Valtrex.

• Side effects may include:
  Abdominal pain, aggressive behavior, agitation, allergic reactions, coma, confusion, decreased consciousness, depression, diarrhea, dizziness, facial swelling, hallucinations, headache, hepatitis, high blood pressure, joint pain, mania, menstrual problems, nausea, rapid heartbeat, rash, visual abnormalities, vomiting