The dosage of rhubarb is: decoction with water, 3 ~ 15 grams; external use of appropriate amount, powdered and applied to the affected area. Rhubarb is a traditional Chinese medicine with a bitter taste and cold nature, and belongs to the spleen, stomach, large intestine, liver and pericardium meridians. Its effects are diarrhea and stagnation (removing stagnation through diarrhea and laxatives), clearing heat and fire, cooling the blood and detoxifying the toxin, resolving blood stasis and clearing menstruation, and inducing diuresis to relieve yellowish coloration. Rhubarb can be used for constipation with solid heat stagnation, epistaxis (vomiting blood and nosebleed due to blood heat), eye redness and swelling of the throat, carbuncles and furuncles, intestinal carbuncles (carbuncles occurring in the intestines and bowels, manifested by fever, pain in the right side of the abdomen, and palpable lump), abdominal pain, and menstrual stasis and menstrual occlusion. Rhubarb can also be used for postpartum stasis, bruises, damp-heat dysentery (dysentery caused by damp-heat), jaundice and urinary redness, gonorrhea (increased frequency of urination, dribbling and pain), oedema; and externally for burns. Wine rhubarb is good at clearing heat and toxins from the blood portion of the upper burner (in the four periods of warm disease, it belongs to the most in-depth stage or location of the disease), and is used for red eyes and swollen throat, swollen gums and pain. Ripe rhubarb is used to expel fire and detoxify toxins, and is used to treat fire-poisoned sores and ulcers. Rhubarb charcoal cools the Blood, removes stasis and stops bleeding, and is used for Blood heat with stasis and bleeding disorders. Rhubarb can be taken internally, usually decocted with water, the dosage is 3 to 15 grams; can also be used externally, take the appropriate amount of the drug powder on the affected area. The nature of the drug is bitter and cold, easy to hurt the stomach qi, so people with weak spleen and stomach should not be used. The drug has the effect of promoting blood circulation and removing blood stasis, so women should be cautious of using it during pregnancy, menstruation and lactation. Rhubarb should be used after identification by a professional Chinese medicine practitioner, and should not be used blindly on its own to avoid aggravating the condition or causing adverse reactions.