Do not take this medicine with any of the following medications:

-cidofovir

This medicine may also interact with the following medications:

-adefovir
-amphotericin B
-certain antibiotics like amikacin, gentamicin, tobramycin, vancomycin
-cimetidine
-cisplatin
-colistin
-cyclosporine
-foscarnet
-lithium
-methotrexate
-probenecid
-tacrolimus

They need to know if you have any of these conditions:
-kidney disease
-an unusual or allergic reaction to acyclovir, ganciclovir, valacyclovir, other medicines, foods, dyes, or preservatives
-pregnant or trying to get pregnant
-breast-feeding

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.

Drink 6 to 8 glasses of water or fluids every day while you are taking this medicine. This will help prevent side effects.

You can still pass chickenpox, shingles, or herpes to another person even while you are taking this medicine. Avoid contact with others as directed. Genital herpes is a sexually transmitted disease. Talk to your doctor about how to stop the spread of infection.

Keep out of the reach of children.

Store at room temperature between 15 and 25 degrees C (59 and 77 degrees F). Throw away any unused medicine after the expiration date.