Valacyclovir Hydrochloride 500mg Tablets. Valacyclovir works by slowing the growth and spread of the herpes virus to allow the immune system to treat the infection. The tablets can be used to treat conditions caused by varicella zoster, herpes zoster and herpes simplex such as chickenpox, shingles, cold sores and genital herpes. 30/BTL. Priced per bottle.