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Serious and Rare Reactions to Valtrex

Serious Side Effects

Some Valtrex side effects should be reported immediately to your healthcare provider. These include but are not limited to:
  • Decreased urination
  • Vision changes, including blurred or double vision
  • Unexplained skin rash
  • Unexplained blisters or peeling of the skin
  • Itching
  • Hives
  • Unexplained swelling
  • Wheezing
  • Difficulty breathing or swallowing
  • Unusual bleeding or bruising
  • Unexplained fever
  • Hallucinations
  • Aggressive behavior
  • Unsteady or shaky movements
  • Confusion
  • Speech problems
  • Seizures
  • Tremors.

Rare Side Effects With Valtrex

Rare side effects happen in very few patients taking the drug. Because these side effects are so rare, it is difficult to tell whether they are caused by the Valtrex or by something else.
Some of these rare side effects include but are not limited to:
  • Low blood counts, including low white blood cells (neutropenia), low platelets (thrombocytopenia), or low red blood cells (anemia)
  • High blood pressure (hypertension)
  • Increased heart rate (tachycardia)
  • Behavioral or mental changes
  • Diarrhea
  • Vision changes
  • Hair loss (see Valtrex and Hair Loss)
  • Hepatitis (liver inflammation)
  • Kidney failure (renal failure).

Final Thoughts

You may experience some or none of the side effects listed in this article. Unfortunately, there is no way for your healthcare provider to know beforehand if you will have side effects from a medicine that you have never tried. Therefore, let your healthcare provider know if you develop any side effects while taking the drug or if you develop something that "just does not seem right." While it may not be a side effect of Valtrex, your healthcare provider can diagnose and treat the problem.
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