Principal (chief) Herb: Main herb in the prescription, which is directed against and has the most impact on the causes or the main symptoms.
Adjuvant Herb: either aides the principal herb in treating symptoms or serves as the main ingredient directed against co-existing symptoms.
Assistant Herb: 3 different functions.
For treating the accompanying disease or syndromes.
To counter the potent side effects or toxicity of the principal and adjuvant herb.
To produce a supplementary effect in the treatment and to be used in complex disorders.
Guide Herb
For leading the effects of other drugs to the affected sites.
To balance the action of other herbs in the prescription.
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