Classification of crude drugs
�@Primary drugs are the most frequently used drugs and have great influence on the character of prescription. They are Ci, La, Rhe, Zi, Zin and Zinsic. Secondary drugs are moderately used drugs and have moderate influence on the character of prescription. They are Alli, Ephe, Pru, Au, Cop, Dra, Gly, Ma, etc. All these drugs are also classified into 3 groups mentioned above, i.e., sweating-related drugs, urination-related drugs and defecation related drugs.