ABSTRACT
OBJECTIVE:To study pharmacokinetics of cyclosporine in healthy volunteers, and to investigate the relationship of drug exposure with blood sampling time after treatment. METHODS: The data of trial at the first 12 blood sampling time points after medication were collected from bioequivalence test in 24 healthy volunteers (trial preparation vs. reference preparation). Multiple linear regression analysis was used to study the blood concentrations of cyclosporine at different sampling time points and the area under the blood concentration-time curve (AUC). RESULTS: The concentrations at two points were adopted to estimate AUC. The correlation coefficient of different cyclosporines could reach 0.9 with estimation deviations less than 15%. The AUC of cyclosporine of trial preparation could be estimated by C8 and C12, and that of reference preparation by C2.5 and C12. CONCLUSION: The AUC estimated by concentrations at two points can meet clinical demand. There is great difference in estimate point among different preparations.