title: A placebo-controlled evaluation of single, escalating doses of CL 284,846, a non-benzodiazepine hypnotic.
abstract: This report describes the first evaluation in humans of CL 284,846, a non-benzodiazepine compound with a preclinical profile indicative of sedative/hypnotic properties. Healthy, normal male volunteers were assigned randomly to receive single oral doses of 1, 5, 15, 30, or 60 mg of CL 284,846 or placebo on a double-blind basis. Observations were made over the subsequent 25 hours to determine the safety, pharmacokinetic profile, and psychometric effects of the test compound. CL 284,846 was well tolerated in the normal volunteers, causing no significant changes in vital signs, EEG, ECG, hematologic, or clinical chemistry laboratory parameters. Although few adverse events were noted at doses less than 60 mg, at the highest dose (60 mg), all volunteers reported transient neurologically related adverse events (e.g., impaired concentration, difficulty focusing, and impaired coordination), reflecting the central nervous system action of the compound. Although determination of hypnotic efficacy was not an objective in this Phase I study, daytime treatment with 60 mg of CL 284,846 was associated with greater reports of drowsiness and impaired performance on psychomotor tests. However, memory, as assessed by a word recall test, was not affected at any dose of the compound. Pharmacokinetic analyses revealed CL 284,846 to be absorbed and eliminated rapidly (Tmax = 0.9-1.5 hr, T 1/2 = 0.9-1.1 hr), with a dose-proportional AUC (area under cure). Plasma levels of CL 284,859, the primary desethylated metabolite of CL 284,846, were much lower in humans than in other species, indicating that the metabolism of CL 284,846 in humans may differ from that of rodents and dogs. Overall, CL 284,846 was well tolerated, and the authors recommend repeating dose safety and pharmacokinetic studies in healthy volunteers.
authors.affiliation: American Cyanamid Co., Medical Research Division, Lederle Laboratories, Pearl River, NY 10965.
authors.forename: B
authors.initials: B
authors.lastname: Beer
authors.forename: J R
authors.initials: JR
authors.lastname: Ieni
authors.forename: W H
authors.initials: WH
authors.lastname: Wu
authors.forename: D
authors.initials: D
authors.lastname: Clody
authors.forename: P
authors.initials: P
authors.lastname: Amorusi
authors.forename: J
authors.initials: J
authors.lastname: Rose
authors.forename: T
authors.initials: T
authors.lastname: Mant
authors.forename: J
authors.initials: J
authors.lastname: Gaudreault
authors.forename: A
authors.initials: A
authors.lastname: Cato
authors.forename: W
authors.initials: W
authors.lastname: Stern
mesh_terms: D000081:Acetamides / Q000008:administration & dosage* / Q000009:adverse effects / Q000493:pharmacokinetics; D000293:Adolescent; D000328:Adult; D000818:Animals; D004311:Double-Blind Method; D004334:Drug Administration Schedule; D006801:Humans; D006993:Hypnotics and Sedatives / Q000008:administration & dosage* / Q000009:adverse effects / Q000493:pharmacokinetics; D008297:Male; D008657:Metabolic Clearance Rate; D011581:Psychological Tests; D011594:Psychometrics; D011597:Psychomotor Performance / Q000187:drug effects; D011743:Pyrimidines / Q000008:administration & dosage* / Q000009:adverse effects / Q000493:pharmacokinetics
chemical_list: D000081:Acetamides; D006993:Hypnotics and Sedatives; D011743:Pyrimidines; C085665:zaleplon