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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?
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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Possible Side Effect
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, ha
llucinations, headache, hepatitis, high blood pressure, joint pain, mania, menstrual problems, nausea, rapid heartbeat, rash, visual abnormalities, vomiting
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Why is this medication prescribed?
Valtrex is used to treat herpes zoster (shingles) and genital herpes. It does not cure herpes infections but decreases pain and itching, helps sores to heal, and prevents new ones from forming
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Special warnings about this medication
High doses of Valtrex have proved dangerous in people whose immune system is compromised because of HIV infection, bone marrow transplant, or kidney transplant.
If your kidneys are not funct
ioning properly, or you are taking drugs that may damage the kidneys such as Neomycin or Streptomycin, Valtrex can make your condition worse or affect your central nervous system (brain and spinal cor
d).
Effects on the central nervous system are more common in older adults, leading to such symptoms as agitation, confusion, and hallucinations. Their kidneys are also more likely to be affe
cted; and those with kidney problems need a smaller dose. Older adults tend to suffer the pain of shingles for a longer time after healing has begun.
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Symptoms of overdose
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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