在温水浴中,由于人的皮肤角质层吸收水分而变疏松,使物质的穿透性增高,易受刺激,所以即使用少量的浴剂也能获得较好的临床效果。浴剂通过加速血液循环而促进新陈代谢、体内废物的排泄及疲劳的恢复,增强运动功能,同时还具有镇静、镇痛、松弛肌肉、杀菌、清洁等作用。现在,在日本市场上出售的浴剂(包括含有生药的浴剂)按药事法分为 In a warm water bath, since the human skin horny layer absorbs moisture and becomes loose, the penetration of the substance is increased, and it is easily stimulated. Therefore, even a small amount of bath agent can obtain a better clinical effect. The bath agent promotes metabolism by accelerating blood circulation, excretion of body waste and recovery of fatigue, enhances exercise functions, and also has the effects of calming, analgesic, relaxing muscles, sterilization, and cleansing. Bath agents (including baths containing crude drugs) sold in the Japanese market are now classified according to the drug law.