剂量个体化。口服,成人,首剂0.5mg~1mg,根据血压调整剂量,一般为6mg~15mg/日,2~3次/日。合用其它药物一般2mg~6mg/日,2~3次/日。儿童,0.25mg~0.5mg/次,2~3次/日,按临床疗效调整剂量。