Valtrex Valacyclovir Hydrochloride Side Effects, Interactions. The antiviral medications are most effective when started within 72 hours after the onset of the rash. VALTREX valacyclovir hydrochloride is the hydrochloride salt of the L-valyl ester of the antiviral drug acyclovir. VALTREX Caplets are for oral administration.
Valtrex - FDA Factors that decrease immune function, such as human immunodeficiency virus infection, chemotherapy, malignancies and chronic corticosteroid use, may also increase the risk of developing herpes zoster. Mechanism of Antiviral Action Valacyclovir hydrochloride is rapidly converted to. VALTREX and a 350-mg intravenous acyclovir dose to 12 healthy volunteers.
Management of Herpes Zoster Shingles and Postherpetic Neuralgia. Reactivation of latent varicella-zoster virus from dorsal root ganglia is responsible for the classic dermatomal rash and pain that occur with herpes zoster. Apr 15, 2000. Other antiviral medications include famciclovir and valacyclovir. The antiviral medications are most effective when started within 72 hours after.