OBJECTIVE: This study was done to test the hypothesis that serum concentration of norclozapine is a risk factor for leukopenia during treatment with clozapine. METHOD: Maximum decreases in leukocyte counts in 44 unselected patients treated with clozapine were determined and then correlated with drug doses and serum concentrations of clozapine, norclozapine, and clozapine-N-oxide. RESULTS: White cell and granulocyte counts decreased by up to 60%-73%, but there were no positive correlations between these decrements and drug dose, drug level, ratio of drug level to drug dose, or ratio of norclozapine level to clozapine level, nor were the decreases related to age or gender. CONCLUSIONS: While these results do not suggest in vivo hemotoxicity of norclozapine, further study of patients with clinically significant leukopenia is required.
OBJECTIVE: This study was done to test the hypothesis that serum concentration of norclozapine is a risk factor for leukopenia during treatment with clozapine. METHOD: Maximum decreases in leukocyte counts in 44 unselected patients treated with clozapine were determined and then correlated with drug doses and serum concentrations of clozapine, norclozapine, and clozapine-N-oxide. RESULTS: White cell and granulocyte counts decreased by up to 60%-73%, but there were no positive correlations between these decrements and drug dose, drug level, ratio of drug level to drug dose, or ratio of norclozapine level to clozapine level, nor were the decreases related to age or gender. CONCLUSIONS: While these results do not suggest in vivo hemotoxicity of norclozapine, further study of patients with clinically significant leukopenia is required.
Authors: K van der Weide; H Loovers; K Pondman; J Bogers; T van der Straaten; E Langemeijer; D Cohen; J Commandeur; J van der Weide Journal: Pharmacogenomics J Date: 2016-05-10 Impact factor: 3.550
Authors: Madeleine S A Tan; Faraz Honarparvar; James R Falconer; Harendra S Parekh; Preeti Pandey; Dan J Siskind Journal: Psychopharmacology (Berl) Date: 2021-01-07 Impact factor: 4.530
Authors: S E Legge; M L Hamshere; S Ripke; A F Pardinas; J I Goldstein; E Rees; A L Richards; G Leonenko; L F Jorskog; K D Chambert; D A Collier; G Genovese; I Giegling; P Holmans; A Jonasdottir; G Kirov; S A McCarroll; J H MacCabe; K Mantripragada; J L Moran; B M Neale; H Stefansson; D Rujescu; M J Daly; P F Sullivan; M J Owen; M C O'Donovan; J T R Walters Journal: Mol Psychiatry Date: 2016-07-12 Impact factor: 15.992