Purpose: The primary aim of this study was to evaluate the safety, tolerability and pharmacokinetics of single ascending doses of Naoqingzhiming tablet after oral administration in healthy Chinese subjects. Methods: This study adopted randomized, double-blind, placebo-controlled dose ascending trial design. Healthy Chinese subjects were sequentially enrolled into one of six cohorts (180, 360, 720, 1080, 1620, 2160 mg). Blood samples were collected at specified time intervals, and the plasma concentrations of echinacoside were determined by a validated LC–MS/MS method. PK parameters were estimated via non-compartmental methods. Tolerability was evaluated by monitoring adverse events (AEs), physical examination, laboratory assays, vital signs, and 12-lead ECG. Results: The single ascending dose of Naoqingzhiming tablet (180-2160 mg) were well tolerated in all enrolled subjects, without serious adverse events and adverse events leading to withdrawal from the study. After single-dose administration of Naoqingzhiming tablet, echinacoside was absorbed with a Tmax at 1.25-1.75 h and declined with a t1/2 of 2.42-3.33 h. However, the proportionality coefficients for Cmax, AUC0-t and AUC0-∞ of echinacoside were not fully contained in the pre-defined 90 % CI criterion (0.91-1.09). As a result, the dose proportionality could not be concluded statistically within the dosage range of this study. Conclusion: Our study provided the initial safety, tolerability and pharmacokinetic profiles of Naoqingzhiming tablet, and could enable further clinical development in vascular dementia patients.

Background:This study was conducted to compare the PK characteristics, food effect and evaluate the bioequivalence between two fixed-dose combinations of lisinopril /amlodipine besylate in healthy Chinese subjects. Methods: A single center, randomized, open-label, single-dose, crossover bioequivalence study was designed in healthy Chinese subjects under both fasting and fed conditions. Cmax and AUC were used to evaluate bioequivalence. Adverse events were recorded. Results: 75 healthy subjects completed the study. The 90% confidence intervals of the ratio of geometric means of Cmax and AUC0-∞ of lisinopril and amlodipine fell within 0.80-1.25. A fat-high breakfast produced significant alteration in the Cmax and AUC of lisinopril after a dose of either reference or test drug. No severe adverse events were observed. Conclusion: The trial demonstrated that the test and the reference drug of fixed-dose combinations of lisinopril /amlodipine besylate were bioequivalent and well tolerated under fasting and fed condition