激素类药患有慢性肾炎或类风湿病需长期服用激素，清晨一次服药比一日三次分服的副作用小得多。因为，早上6－8点，是肾上腺分泌激素的高峰期，而晚上10点则处于低潮。抗结核药结核杆菌需靠药物浓度高峰来杀灭或抑制其繁殖生长，而不是要血液维持一定浓度，故抗结核药物如异菸 Hormones suffering from chronic nephritis or rheumatoid arthritis need long-term use of hormones, taking medication in the morning three times a day than the small side effects of serving much smaller. Because, 6-8 in the morning, is the peak of adrenal secretion of hormones, and 10 o’clock at a low ebb. The anti-TB drug Mycobacterium tuberculosis need to rely on the peak drug concentration to kill or inhibit its reproductive growth, rather than to maintain a certain concentration of blood, so anti-TB drugs such as isonia