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. Author manuscript; available in PMC: 2013 Jun 5.
Published in final edited form as: Psychiatr Serv. 2007 Apr;58(4):489–495. doi: 10.1176/appi.ps.58.4.489

Table 2.

Mean antipsychotic dosages prescribed to patients in the Department of Veterans Affairs who were given long-term antipsychotic prescriptions, by number of antipsychotics received

Polypharmacy
Monotherapy
Dosage
Dosage
Antipsychotic N M SD N M SD Wilcoxon z p
Second generationa
    Clozapine 327 507.7 203.2 1,233 496.9 193.5 .92 .356
    Olanzapine 3,064 15.8 8.3 11,346 14.0 7.4 10.65 <.001
    Quetiapine 757 347.3 240.5 1,242 309.8 199.4 2.46 .014
    Risperidone 2,313 4.8 3.0 9,276 4.3 2.6 4.96 <.001
First generationb
    Chlorpromazine 678 287.8 295.8 1,728 316.0 276.7 −3.47 .001
    Fluphenazine 566 768.7 686.9 1,740 777.9 635.2 −1.08 .282
    Haloperidol 1,484 703.4 637.5 4,153 675.2 634.2 2.25 .024
    Loxapine 372 821.9 651.3 833 796.5 680.4 1.01 .312
    Mesoridazine 88 308.6 251.7 227 288.4 247.4 .53 .596
    Molindone 32 687.5 599.7 107 708.9 650.9 −.18 .855
    Perphenazine 399 209.0 184.6 1,765 196.5 177.5 .79 .433
    Pimozide 12 210.4 132.1 7 333.7 307.9 1.13 .260
    Thioridazine 571 204.0 177.0 2,309 210.2 173.4 −1.17 .241
    Thiothixene 465 414.4 338.3 1,757 372.5 311.9 2.63 .009
    Trifluoperazine 410 368.7 310.6 1,452 357.1 299.7 .25 .806
a

All dosages expressed in milligrams

b

All dosages expressed in chlorpromazine equivalents