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Fresh and dried rehmannia root
This medicine is too weak, so the dosage is usually very large, between 15 and 30 grams, and the fresh product is even weaker, so the dosage should be doubled.

This medicine is mainly for clearing heat from the lungs and stomach. It can be used for coughing in lung heat, vomiting in stomach heat, and burning in urine in hot showers.

Dried reeds or reed sticks have the same effect.