What side effects can this medication cause?

Topical acyclovir may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:

• dry or cracked lips
• flaky, peeling, or dry skin
• burning or stinging skin
• redness, swelling, or irritation in the place where you applied the medication

Some side effects can be serious. If you experience any of these symptoms, call your doctor immediately:

• hives
• rash
• itching
• difficulty breathing or swallowing
• swelling of the face, throat, lips, eyes, hands, feet, ankles, or lower legs
• hoarseness

Topical acyclovir may cause other side effects. Call your doctor if you have any unusual problems while using this medication.

If you experience a serious side effect, you or your doctor may send a report to the Food and Drug Administration's (FDA) MedWatch Adverse Event Reporting program online at http://www.fda.gov/MedWatch/report.htm or by phone 1-800-332-1088.