title: Bioequivalence assessment of two enteric-coated aspirin brands, Nu-Seals and Loprin, after a single oral dose of 150 mg in healthy male adults.
abstract: OBJECTIVE
  The bioequivalence of aspirin from two enteric-coated brands, Nu-seals and Loprin, identified as the reference (R) and test (T) products, respectively, was assessed.
  
  
  METHODS
  A two-period randomised crossover design with a washout interval of 15 days was used in this study. The study results were determined in 16 healthy volunteers, all males with ages ranging from 19-28 (23.33 +/- 3.74) years and bodyweights of 52-92 (65.89 +/- 11.39) kg. After oral ingestion of 150mg of the either brand with 200 mL of water, serial blood samples were obtained over a period of 24 hours. Plasma, harvested from blood was analysed for the concentration of salicylic acid, a deacetylated metabolite of aspirin, by a validated high performance liquid chromatography (HPLC) method. Pharmacokinetic parameters were determined for both formulations by an interactive computer-assisted PK II procedure. A general linear model for repeated measures and 90% confidence intervals (CI) was employed to assess the sequence of treatment effects and to exclude differences between the parameters due to the product and period of administration, respectively.
  
  
  RESULTS
  The observed 90% CI ratios (Loprin/Nu-seals) for peak concentration, time to reach the peak and area under the plasma-concentration time curve from zero to infinity of 1.03,1.08; 1.04,1.05 and 1.01,1.15, respectively, were within the bioequivalence range (0.80,1.25) stipulated by the US Food and Drug Administration.
  
  
  CONCLUSIONS
  On the basis of the findings, the test (Loprin) and reference drug (Nu-seals) were deemed bioequivalent.
authors.affiliation: School of Pharmacy, International Medical University (IMU), Kuala Lumpur, Malaysia. nadeem_irfan@hotmail.com
authors.forename: Nadeem Irfan
authors.initials: NI
authors.lastname: Bukhari
authors.forename: Azia
authors.initials: A
authors.lastname: Zafar
authors.forename: Waseem ur Rehman
authors.initials: Wu
authors.lastname: Shamsi
authors.forename: Muhammad Amir
authors.initials: MA
authors.lastname: Bashir
authors.forename: Ahmad Atif
authors.initials: AA
authors.lastname: Mirza
mesh_terms: D000328:Adult; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000008:administration & dosage* / Q000493:pharmacokinetics*; D001241:Aspirin / Q000008:administration & dosage* / Q000493:pharmacokinetics*; D002851:Chromatography, High Pressure Liquid; D004311:Double-Blind Method; D006801:Humans; D008297:Male; D013608:Tablets, Enteric-Coated; D013810:Therapeutic Equivalency
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D013608:Tablets, Enteric-Coated; D001241:Aspirin