According to the Health Product InfoWatch December 2022 edition released by Health Canada on December 22, 2022, cases of Valtrex-associated DRESS have been reported as a Valtrex side effect. Further, therein, it is reported that GlaxoSmithKline Inc. has updated the Canadian product monograph for Valtrex to add information about the risk of Valtrex-associated DRESS.
Valtrex (valacyclovir) is a long-established treatment for cold sores, genital herpes, and herpes zoster, having been initially approved by the FDA in 1995. The Full Prescribing Information document for Valtrex in the United States does not currently have any discussion of or warning about Valtrex-associated DRESS as a possible Valtrex side effect. We will watch to see whether the FDA follows the lead of Health Canada and require a Valtrex drug label change to add information about drug reaction with eosinophilia and systemic symptoms (DRESS).
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