味苦凉.入手足太阴厥阴经.功专活血润燥.治肠风泻血.痢后热渴.作饮服.令人得睡.以肥皂水浸.或浸汁磨拌雄黄擦顽癣及虫疮良.以槿皮二两.酒碗半.煎一碗.空心服.治带下.赤带用白酒.白带用红酒最妙.川产者佳.不宜多服.汤剂不入为是.