title: Prediction of the optimal perphenazine decanoate dose based on blood samples drawn within the first three weeks.
abstract: During a 3-month period, 52 paranoid psychotic inpatients were treated with perphenazine decanoate (Trilafon decanoate) in order to determine a treatment schedule ensuring perphenazine serum levels within the optimal range (2-6 nmol/L). All patients received 1 ml (108 mg) perphenazine decanoate on days 0, 7 and 21, after which the doses and intervals were individually adjusted according to the clinical condition. It was shown that the sum of 2 measurements of perphenazine concentration early during treatment, viz., on days 14 and 21, correlates strongly (r = 0.96) with the steady-state level obtained after 3 months. Consequently, a nomogram for dose and length of interval could be elaborated giving steady-state serum levels of perphenazine of about 4 nmol/L, i.e., in the middle of the optimal concentration range.
authors.affiliation: Department of Clinical Chemistry, Glostrup Hospital, Denmark.
authors.forename: N E
authors.initials: NE
authors.lastname: Larsen
authors.forename: L B
authors.initials: LB
authors.lastname: Hansen
mesh_terms: D000293:Adolescent; D000328:Adult; D003692:Delayed-Action Preparations; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010546:Perphenazine / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000097:blood / Q000493:pharmacokinetics
chemical_list: D003692:Delayed-Action Preparations; D010546:Perphenazine; C047342:perphenazine decanoate