Cassia seeds in water can be put 9-15 grams at a time, but the exact dosage should vary according to the condition. Pharmacopoeia provides that the recommended dosage of cassia seeds for adults is 9-15 grams per use, so you can use 9-15 grams when brewing water to drink, and you can use less than 9 grams of dosage, but it is not recommended to use large doses blindly. Cassia seeds are heat-clearing Chinese medicine, sweet, bitter and salty, slightly cold in nature, belonging to the liver meridian and the large intestine meridian, has the effect of clearing the liver and brightening the eyes (clearing the liver fire to promote the recovery of vision), laxative and laxative effect, can be used for the treatment of swollen and painful eyes, dryness, tearing, blurred vision, headache and dizziness, intestinal dryness and constipation and other conditions. Cassia seeds are cold in nature, and should not be used by patients with spleen deficiency and loose stools (thin and unformed feces), and avoid eating spicy food during the period of taking the medicine. Because cassia seeds are generally used after the decoction, and a single medicine to drink water with less efficacy, it is difficult to achieve the effect of the treatment of disease, in order to enter the medicine to treat the disease, you need to have a professional doctor’s guidance, not to be used on their own.