If one uses the traditional calculation of dosage based on body weight, overdoses could result. Also, the adjustment capacity of the elderly is inadequate.
老年人的調適能力差，也是醫生在用藥上要考慮的另一個因素。像老人高血壓病患使用利尿劑，往往造成體內鉀離子、鈉離子失衡。