During long-term drug therapy, the extent of absorption is the more important measurement because average concentration depends on it; the degree of fluctuation is related to the absorption rate constant.

• 在长期药物治疗期间，吸收的分量测量指标更重要，因为平均浓度就是根据它来计算的，而浓度的波动程度则与吸收速率常数有关。