What side effects may I notice from receiving Acyclovir?

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
-chest pain
-confusion, hallucinations, tremor
-dark urine
-increased sensitivity to the sun
-redness, blistering, peeling or loosening of the skin, including inside the mouth
-seizures
-trouble passing urine or change in the amount of urine
-unusual bleeding or bruising, or pinpoint red spots on the skin
-unusually weak or tired
-yellowing of the eyes or skin

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

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