What side effects may I notice from receiving Valacyclovir ?

Side effects that you should report to your doctor or health care professional as soon as possible:
-allergic reactions like skin rash, itching or hives, swelling of the face, lips, or tongue
-aggressive behavior
-confusion
-hallucinations
-problems with balance, talking, walking
-stomach pain
-tremor
-trouble passing urine or change in the amount of urine

Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):
-dizziness
-headache
-nausea, vomiting

This list may not describe all possible side effects for Valacyclovir . Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.