The present invention is directed to a method for inhibiting herpes viral activity in a subject, by administering to the subject in need thereof an active ingredient consisting essentially of an effective amount of diclofenac (for example, 3-7% w/w) or a pharmaceutically acceptable salt thereof.本發明係關於一種抑制個體體內之疱疹病毒活性的方法,其藉由向有此需要之個體投予基本上由有效量之雙氯芬酸(例如3-7% w/w)或其醫藥學上可接受之鹽所組成之活性成份而達成。