臣药，中医方剂学名词。是辅助君药加强治疗主病或主证或是针对兼病或兼证起治疗作用的药物。其在方剂中之药力小于君药。
结果表明：白芍是君药，甘草是臣药和佐药；
Results showed that paeony was the sovereign drug, while glycyrrhiza was the minister drug and the assistant drug;
臣：辅助君药治疗主要病症的药物，或针对兼症起治疗作用的药物。
I: Auxiliary gentleman medicine treats the medicaments of main disease, or be aimed at the medicaments that holds effect of the therapy since disease concurrently.
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