Hello, Welcome to Just Answer and thanks for your question. Valtrex is valacyclovir and Zovirax is acyclovir. Neither is typically prescribed for Epstein-Barr. Both are used for genital herpes and for varicella (shingles) infections. If the 743.00 is supposed to be the diagnosis code, it stands for anophthalmos, a condition in which eye tissue did not form during fetal development.