title: Population analysis of the pharmacokinetics and pharmacodynamics of seratrodast in patients with mild to moderate asthma.
abstract: BACKGROUND
  Seratrodast, a potent thromboxane receptor antagonist, is approved in Japan for the treatment of asthma and currently is being developed in the United States.
  
  
  METHODS
  This was a phase II, randomized, double-blind, parallel-group, placebo-controlled 15-center study of seratrodast in patients with mild to moderate asthma. A total of 183 patients were randomly assigned to receive daily doses of either placebo, or 80 mg seratrodast, or 120 mg seratrodast for 8 weeks. Pharmacokinetic and pharmacodynamic modeling was carried out by means of the population approach. A two-compartment model with zero-order input and first-order elimination best fitted the plasma concentration-time data.
  
  
  CONCLUSIONS
  The pharmacokinetics of seratrodast were linear after single and multiple dosing for 8 weeks. The population estimates for oral clearance and apparent volume of distribution were 8.5 ml/hr/kg and 43.3 ml/kg, respectively. All pharmacokinetic parameters (the oral central compartment clearance, the volumes of distribution of the central and peripheral compartments, and the intercompartmental clearance) were estimated with a precision of 10% or less and were found to be associated with body weight. The residual variability was 30%. The values of oral clearance estimated in this study in male patients were similar to those previously estimated in healthy male subjects. Seratrodast at a dose of 120 mg daily produced an increase in forced expiratory volume in 1 second (FEV1) from baseline that was linearly correlated with its plasma concentrations. The average slope of the concentration-effect relationship was 0.222% and 0.470% per microgram/ml after single and multiple dosing, respectively. Interpatient variability in response was mainly affected by the initial severity of the disease. A lower percentage of predicted FEV1 (i.e., more severe obstruction) was associated with higher slopes, and greater increases in FEV1.
authors.affiliation: Abbott Laboratories, Abbott Park, IL, USA.
authors.forename: E
authors.initials: E
authors.lastname: Samara
authors.forename: G
authors.initials: G
authors.lastname: Cao
authors.forename: C
authors.initials: C
authors.lastname: Locke
authors.forename: G R
authors.initials: GR
authors.lastname: Granneman
authors.forename: R
authors.initials: R
authors.lastname: Dean
authors.forename: A
authors.initials: A
authors.lastname: Killian
mesh_terms: D000328:Adult; D000368:Aged; D018927:Anti-Asthmatic Agents / Q000493:pharmacokinetics / Q000494:pharmacology*; D001249:Asthma / Q000097:blood* / Q000188:drug therapy* / Q000503:physiopathology; D016227:Benzoquinones / Q000493:pharmacokinetics / Q000494:pharmacology*; D004311:Double-Blind Method; D005260:Female; D005541:Forced Expiratory Volume / Q000187:drug effects; D006538:Heptanoic Acids / Q000493:pharmacokinetics / Q000494:pharmacology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012720:Severity of Illness Index; D013997:Time Factors; D016896:Treatment Outcome
chemical_list: D018927:Anti-Asthmatic Agents; D016227:Benzoquinones; D006538:Heptanoic Acids; C060230:seratrodast