Oral. Disperse and dissolve with a small amount of water, and take orally or directly. Adults and children over 6 years old: take one tablet (5mg) once a day. Children aged 2-6: take half a tablet once a day. Can be taken on an empty stomach, during or after meals. Patients with renal impairment: patients with mild renal impairment do not need to adjust the dose. The usage and dosage of patients with moderate and severe renal impairment are adjusted according to the following table: creatinine clearance rate (ml/min)[sup]a [/sup] dosage and medication times of patients with renal impairment: 30-49 patients with moderate renal impairment every 2 days 1 time, 5mg patients with severe renal impairment < 30 every 3 days 1 time, 5mg patients with advanced renal disease-dialysis patients < 10 contraindications A. Serum creatinine clearance rate (CLCR ml/min)=[ 10 For patients with renal insufficiency, please refer to the usage and dosage of "patients with renal insufficiency".