title: Pharmacokinetics and bioequivalence study of aniracetam after single-dose administration in healthy Chinese male volunteers.
abstract: The pharmacokinetics of aniracetam (CAS 72432-10-1) in Chinese healthy male volunteers was investigated for the first time. Twenty male volunteers were enrolled into this open, randomized, single blind two-sequence, two-period crossover study. Under fasting conditions, each subject received a single oral dose of 400 mg (2 x 200 mg/capsule) aniracetam as a test or reference formulation with a 3-day washout period between the two preparations. The plasma concentrations of aniracetam were analyzed by a sensitive liquid chromatography-tandem mass spectrometry (LC-MS/MS) method. The pharmacokinetic parameters of the test and reference formulations were estimated as follows: The maximum plasma concentrations (Cmax) were 8.75 +/- 7.82 and 8.65 +/- 8.70 ng/mL, Tmax were 0.4 +/- 0.1 and 0.4 +/- 0.1 h, and plasma elimination half-lives (t(1/2)) were 0.47 +/- 0.16 and 0.49 +/- 0.24 h, respectively. The AUC(0-t) values demonstrated nearly identical bioavailability of aniracetam from the examined formulations. AUC(0-2.5) values were 4.53 +/- 6.62 and 4.76 +/- 6.65 ng h/mL, the areas under the plasma concentration-time curve (AUC(0-infinity) were 4.62 +/- 6.66 and 4.85 +/- 6.71 ng h/mL for the test and reference formulation, respectively. No statistical differences were observed for Cmax, and AUC(0-infinity) for aniracetam. The 90% confidence limits calculated for AUC and Cmax of aniracetam were within the standard bioequivalence range (80%-125% for AUC and Cmax). Therefore, the aniracetam test formulation can be regarded as bioequivalent to the aniracetam reference formulation.
authors.affiliation: Key Laboratory of Drug Quality Control and Pharmacovigilance, China Pharmaceutical University, Ministry of Education, Nanjing, The People's Republic of China.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Tian
authors.forename: Jing-Jing
authors.initials: JJ
authors.lastname: Zhang
authors.forename: Shu-Dan
authors.initials: SD
authors.lastname: Feng
authors.forename: Zun-Jian
authors.initials: ZJ
authors.lastname: Zhang
authors.forename: Yun
authors.initials: Y
authors.lastname: Chen
mesh_terms: D000704:Analysis of Variance; D019540:Area Under Curve; D001682:Biological Availability; D002626:Chemistry, Pharmaceutical; D018592:Cross-Over Studies; D004311:Double-Blind Method; D006207:Half-Life; D006801:Humans; D008297:Male; D018697:Nootropic Agents / Q000493:pharmacokinetics* / Q000494:pharmacology*; D011760:Pyrrolidinones / Q000493:pharmacokinetics* / Q000494:pharmacology*; D013810:Therapeutic Equivalency; D055815:Young Adult
chemical_list: D018697:Nootropic Agents; D011760:Pyrrolidinones; C036466:aniracetam