title: Assessment of the cardiac safety and pharmacokinetics of a short course, twice daily dose of orally-administered mifepristone in healthy male subjects.
abstract: BACKGROUND
  Mifepristone is approved to control hyperglycemia in adults with endogenous Cushing's syndrome and is described as a mildly QTc prolonging drug, based on a TQT study. The aim of the present study was to assess the effect of mifepristone on the QTc interval at plasma mifepristone concentrations exceeding those observed in the TQT study.
  
  
  METHODS
  Twenty healthy, male volunteers were given three doses of 1200 mg mifepristone every 12 h with a high-fat meal in a randomized, placebo-controlled 2-period crossover study. Holter ECG recordings were made on Day 1 and 2.
  
  
  RESULTS
  Eighteen subjects completed the study. Mean peak plasma mifepristone concentrations were 4.01 μg/mL (CV: 31%) on the fi rst dose and 5.77 μg/mL (CV: 29%) on the third dose. Mifepristone did not have a meaningful QTc effect. The placebo-corrected, change-from- -baseline QTcF (ΔΔQTcF) was between -1.6 and 0.7 ms on the fi rst dose (upper bound of 90% CI 3.8 ms) and the largest ΔΔQTcF on the third dose was 4.9 ms (upper bound of 90% CI: 8.4 ms). Concentration effect modeling showed a slightly negative slope of -0.01 ms/ng/mL.
  
  
  CONCLUSIONS
  Mifepristone did not cause a clinically meaningful QTc prolongation in healthy volunteers at plasma concent rations of mifepristone and its main metabolites that clearly exceeded those seen in a previous TQT study.
authors.affiliation: Department of Clinical Sciences, Danderyd's Hospital, Division of Cardiovascular Medicine, Stockholm, Sweden. borje.darpo@telia.com.
authors.forename: Borje
authors.initials: B
authors.lastname: Darpo
authors.forename: Roy
authors.initials: R
authors.lastname: Bullingham
authors.forename: Daniel L
authors.initials: DL
authors.lastname: Combs
authors.forename: Georg
authors.initials: G
authors.lastname: Ferber
authors.forename: Karen
authors.initials: K
authors.lastname: Hafez
mesh_terms: D000284:Administration, Oral; D000328:Adult; D018592:Cross-Over Studies; D004311:Double-Blind Method; D004334:Drug Administration Schedule; D004562:Electrocardiography; D064368:Healthy Volunteers; D006339:Heart Rate / Q000187:drug effects; D006801:Humans; D007004:Hypoglycemic Agents / Q000008:administration & dosage / Q000009:adverse effects / Q000097:blood / Q000493:pharmacokinetics*; D008133:Long QT Syndrome / Q000139:chemically induced / Q000503:physiopathology; D008297:Male; D015735:Mifepristone / Q000008:administration & dosage / Q000009:adverse effects / Q000097:blood / Q000493:pharmacokinetics*; D018570:Risk Assessment; D012307:Risk Factors
chemical_list: D007004:Hypoglycemic Agents; D015735:Mifepristone