对羟基苯甲酸的甲醅和乙酯俗名尼泊金M(Nipagin M)及尼泊金 A(Nipagin A)。许多国家的付药典均有收载,是优良的防腐剂。其防腐功效鞍苯甲酸及水杨酸为佳,常用於液体成药及乳剂中,现并试用於水煎剂和中药制剂中。由于乙醋比甲酯的杀菌力强,毒性也低,原料又容易得到,所以各地都在自制; Paraben and ethyl p-hydroxybenzoate Nipagin M and Nipagin A. Pharmacopoeia in many countries are included, is a good preservative. Its anti-corrosion effect of benzoic acid and salicylic acid is better, commonly used in liquid medicine and emulsion, and now try the decoction and Chinese medicine preparations. Due to the bactericidal power of ethyl acetate than methyl ester, toxicity is low, raw materials and easy to get, so all over the self-made;