title: Pharmacokinetic interaction studies of atosiban with labetalol or betamethasone in healthy female volunteers.
abstract: OBJECTIVE
  In two separate trials, we studied the concomitant administration of atosiban with labetalol and betamethasone to determine any possibility of a clinically relevant pharmacokinetic interaction.
  
  
  METHODS
  Study 1 was an open-label, single dose atosiban, multiple dose labetalol, interaction study. Study 2 was an open-label, randomised, three-period crossover pharmacokinetic study.
  
  
  METHODS
  The studies were carried out at the Clinical Pharmacology Unit of AAI Deutschland GmbH & Co KG, Neu-Ulm, Germany.
  
  
  METHODS
  The study population consisted of healthy female volunteers.
  
  
  METHODS
  In Study 1, 14 healthy female volunteers participated. On study day 1, a 12-hour intravenous infusion of 114.75 mg atosiban was administered; on days 2-4, participants received labetalol orally (100 mg twice daily), and on study day 5 they received the combined treatment. In Study 2, a total of 18 healthy female volunteers received, on three separate occasions, a 12-hour intravenous infusion of 114.75 mg atosiban, a single intramuscular injection of 12 mg betamethasone or the two drugs in combination.
  
  
  METHODS
  For Study 1, the outcome parameter for atosiban was area under the plasma concentration-time curve (AUC); the study parameters for labetalol were AUC, maximum plasma concentration (C(max)) and time to C(max) (t(max)). In Study 2, AUC, C(max) and time to C(max) (t(max)) were assessed for atosiban and betamethasone.
  
  
  RESULTS
  Labetalol had no clinically relevant influence on the bioavailability (AUC) of atosiban. For labetalol, the co-administration with atosiban did not affect the extent of bioavailability, however, C(max) decreased by 36% and t(max) increased by 45 minutes. The C(min) was not affected by atosiban. The betamethasone and atosiban combination led to similar mean plasma concentration-time curves as the administration of each substance alone. Pharmacokinetic parameters (AUC, C(max), t(max)) did not differ markedly between treatments and all 90% CIs for ratios between treatments were fully within limits (80-125%). The co-administration of atosiban with labetalol or betamethasone resulted in similar tolerability to each substance alone.
  
  
  CONCLUSIONS
  The co-administration of atosiban with betamethasone or labetalol had no clinically relevant influence on their bioavailability or tolerability.
authors.affiliation: Department of Experimental Medicine, Ferring Pharmaceuticals A/S, Copenhagen, Denmark.
authors.forename: Birgitte Buur
authors.initials: BB
authors.lastname: Rasmussen
authors.forename: Lotte Seiding
authors.initials: LS
authors.lastname: Larsen
authors.forename: Thomas
authors.initials: T
authors.lastname: Senderovitz
mesh_terms: D000328:Adult; D000959:Antihypertensive Agents / Q000008:administration & dosage / Q000493:pharmacokinetics*; D019540:Area Under Curve; D001623:Betamethasone / Q000008:administration & dosage / Q000494:pharmacology*; D018592:Cross-Over Studies; D004338:Drug Combinations; D004347:Drug Interactions; D005260:Female; D006801:Humans; D007262:Infusions, Intravenous; D007273:Injections, Intramuscular; D007741:Labetalol / Q000008:administration & dosage / Q000494:pharmacology*; D008875:Middle Aged; D015149:Tocolytic Agents / Q000008:administration & dosage / Q000493:pharmacokinetics*; D014668:Vasotocin / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000493:pharmacokinetics
chemical_list: D000959:Antihypertensive Agents; D004338:Drug Combinations; D015149:Tocolytic Agents; C047046:atosiban; D001623:Betamethasone; D007741:Labetalol; D014668:Vasotocin