ACYCLOVIR (ay SYE kloe veer) is an antiviral medicine. It is used to treat infections caused by certain kinds of viruses. Examples of these infections include cold sores and herpes. This medicine will not cure herpes.
This medicine is only for external use on the skin. Follow the directions on the prescription label. Wash hands before and after use. Use a finger cot or rubber gloves so that you do not spread the infection to another site. Apply a thin layer to cover all lesions. Do not get this medicine in your eyes. If you do, rinse out with plenty of cool tap water. Use this medicine at regular intervals. Do not use more often than directed. Finish the full course prescribed by your doctor or health care professional even if you think you are better. Do not stop using except on your doctor's advice.
Talk to your pediatrician regarding the use of this medicine in children. Special care may be needed.
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
Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):
Interactions are not expected. Do not apply other skin care products (cosmetics, lip balm, or sunscreens) to the sore unless your doctor or health care professional tells you to.
If you miss a dose, use it as soon as you can. If it is almost time for your next dose, use only that dose. Do not use double or extra doses.
Keep out of the reach of children.
Store at room temperature between 15 and 30 degrees C (59 and 86 degrees F). Throw away any unused medicine after the expiration date.
They need to know if you have any of these conditions:
an unusual or allergic reaction to acyclovir, ganciclovir, valacyclovir, other medicines, foods, dyes, or preservatives
pregnant or trying to get pregnant
Tell your doctor or health care professional if your symptoms do not improve. This medicine works best when started very early in the course of an infection. Begin treatment at the first signs of infection.
Even though you are using this medicine, you can still pass herpes to another person. Genital herpes is a sexually transmitted disease. Using this medicine will not stop your sexual partner from getting the infection. It is best to avoid having sex if you have an active herpes infection.