Hydrochlorothiazide usage and dosage varies according to age, the treatment of disease, and can not be simply summarized as follows. 1. Adults: Usage is oral, the specific dosage is as follows. null (1) Treatment of edematous diseases, 25mg ~ 50mg each time, 1 ~ 2 times a day, or every other day treatment, or weekly for 3 days ~ 5 days. null (2) Treatment of hypertension, 25mg ~ 100mg per day, divided into 1 ~ 2 times to take, and according to the effect of lowering the dosage of blood pressure adjusted. null 2. Pediatrics: Usage is oral. The specific dosage is as follows. 1mg/kg～2mg/kg of body weight or 30mg/m²～60mg/m² of body surface area per day, divided into 1～2 times, and adjust the dosage according to the efficacy. The dose for infants younger than 6 months can be up to 3mg/kg daily. However, when using it, it is important to note that the drug may cause disturbances in water and electrolytes; hyperglycemia, hyperuricemia; rash, urticaria; cholecystitis, pancreatitis, hypogonadism, blood leukopenia or deficiency, and other adverse reactions. It is prohibited for those who are allergic to this product; it is not suitable for lactating women, and should be used with caution in pregnant women, and should be used with caution in infants with jaundice. To use this drug under the guidance of a doctor.