Interactions are not expected. Do not use any other skin products on the affected area without telling your doctor or health care professional.

They need to know if you have any of these conditions:
-suppressed immune function
-an unusual or allergic reaction to penciclovir, other medicines, foods, dyes, or preservatives
-pregnant or trying to get pregnant
-breast-feeding

Even though you are using this medicine, you can still spread the herpes infection to another person. Try to keep the sores (blisters) from making contact with another person''s skin.

This medicine works best when applied very early in the course of an infection. Begin treatment at the first sign of infection. These signs include tingling, itching, or pain in the affected area.

Keep out of the reach of children.

Store at room temperature between 20 and 25 degrees C (68 and 77 degrees F). Do not freeze. Throw away any unused medicine after the expiration date.