Common side effects are dizziness, ataxia, fatigue,
nausea and vomiting, joint pain, motion sickness etc. You must tell your physician if you are allergic to valacyclovir or acyclovir. any kidney disease, blood disorders, immune deficiencies, dizziness etc. side effects associated are nausea, vomiting, fatigue, sore throat, hemolytic uremic syndrome etc.
You need to be concerned about the cumulative side effects of the two drugs.