In summary, the effects of the materia medica are mainly manifested in terms of the cold and heat property; the seventeen effects are based on the six tastes of the drug, while the tastes, rely on the five sources of earth, water, fire,
wind, and space. Thus, a heavy and moist nature increases the heaviness of salty, puckery and sweet in order; salty, sour, sweet increase in moisture in order; puckery, bitter and sweet increase in coolness in order; bitter, puckery and sweet increase in bluntness in order; sour, acrid and bitter increase in lightness and stability in order; acrid, sour and salty increase in warmth and sharpness in order. When the taste of a drug doesn't change, its effects remain unchanged.

Though the taste of different drugs may be the same, their actions will change accordingly due to their ingredients of the five sources. Hence, in prescribing, the sum of these tastes should be taken into consideration, and the transformed tastes after digestion should also be taken into account.

Based on the nature of the materia medica, the effects can be described in the following categories.
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