生物利用度系指给药后制剂中药物被吸收的程度和速度。它是判断制剂内在质量的重要标志。美、英等国对于药物的生物利用度均相当重视,1971年美国的药物生物利用度会议上已明确指出,生物利用度应作为药物质量控制的重要内容.1973年据英 Bioavailability refers to the extent and rate at which the drug is absorbed in the formulation after administration. It is an important indicator to judge the inherent quality of the preparation. The United States, Britain and other countries for the bioavailability of drugs are very seriously, the United States in 1971 drug bioavailability meeting has made it clear that bioavailability should be as an important part of drug quality control.