Assistant herbs   Assistant herbs can play one of the following three roles in herbal combination. One is to further assist the monarch herbs and minister herbs to exert their actions, or to relieve the accompanying symptoms or syndrome. The second role is to modulate the toxicity of the monarch herbs and minister herbs, and the third is to provide paradoxical assistance.		zuo yao 佐藥   佐即輔助的意思，佐藥在配方中有三種意義。一是協助君藥及臣藥加強對主証的作用，或直接改善兼証或兼症(又稱為"佐助藥")；二是緩減君藥或臣藥的毒性(又稱為"佐制藥")；三是提供與君藥相反的輔助作用(又稱為"反佐藥")。