The general dosage of cooked rhubarb is 3~15g, the specific dosage should follow the doctor’s prescription. Rhubarb is derived from Rhubarbum palmatum, family Polygonaceae, and its dried stems and rhizomes are cut into thick slices or pieces and steamed in wine. It has the effects of diarrhea, clearing heat and fire, cooling blood and removing toxins, expelling blood stasis and clearing the channels (removing blood stasis and clearing the channels), and inducing dampness and eliminating yellowish color. Rhubarb is used for constipation due to actual heat, abdominal pain due to stagnation, dysentery, jaundice due to dampness-heat, epistaxis (vomiting of blood and nosebleed due to blood-heat), redness and pain of the eyes, amenorrhea due to stasis of blood, and externally for treating scalded by water and fire, etc. The adverse effects of this drug are not clear. Adverse effects of the drug are not clear. Use with caution during pregnancy, menstruation and lactation. The usual dosage of Rhizoma Rhei is 3-30 g. For external use, powdered rhubarb should be applied to the affected area. If there is a need for medication, it is recommended to use it under the guidance of a professional physician, not blindly self-medication.