Objective: To search the release in vitro of new MU-AN ophthahnic gel consist of ganciclovir instead of aciclovir is whether better than the Old. Methods: Using the content of ganciclovir and acyclovir as the index, taking the second oar method ( in Ch. P 2010) , drug release in vitro test was investigated. Results: The character of drug release of new MU-AN ophthalmic gel was e- qual to the old, the rate of drug release was similar, The amount of drug release was the same. Both drugs met the requirements of clin- ical medication. The char...