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Why is this drug prescribed?
Valtrex (val-ay-SYE-kloe-veer) is used to treat the symptoms of herpes zoster (also known as shingles), a herpes virus infection of the skin; it is also used to treat and prevent genital herpes infect
ions. In your body, Valtrex becomes the anti-herpes medicine, acyclovir. Although Valtrex will not cure shingles or genital herpes, it does help relieve the pain and discomfort and helps the sores hea
l faster.
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Proper Use of This Medicine
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 noti
cing 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 t
he 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 s
ores, you should start using it at the earliest signs of infection, such as tingling, itching, or burning.
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What special precautions should I follow?
The effects of Valtrex during pregnancy and breastfeeding have not been adequately studied. If you are pregnant or plan to become pregnant, notify your doctor immediately. If you are nursing and need
to use Valtrex, your doctor may advise you to discontinue breastfeeding while using the medication.
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Overdosage
When taken by people with kidney disorders, excessive doses of Valtrex have been known to cause psychological problems and kidney failure. If you suspect an overdose, check with your doctor immediatel
y.
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Precautions Before Using This Medicine
Allergies¡XTell your doctor if you have ever had any unusual or allergic reaction to Valtrex or acyclovir. Also tell your health care professional if you are allergic to any other substances, such as
oods, sulfites or other preservatives, or dyes.
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Side Effects
Check with your doctor as soon as possible if the following side effect occurs:
- Painful menstruation, including abdominal cramps, diarrhea, or nausea
- Black, tarry stools; ches
t pain; chills; cough; decreased frequency/output of urine; fever; flu-like symptoms; headache; lower back/side pain; reduced mental alertness; shortness of breath; unusual tiredness; yello
w eyes or skin
- Back, leg or stomach pains; changes in behavior, especially in interactions with other people; difficulty breathing or swallowing; fast, pounding, or irregular heartbeat
; high blood pressure; itching; lightheadedness when getting up from a lying or sitting position; redness of skin ;
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