Table 2.
Olanzapine Equivalents for Additional Old First-Generation Antipsychotics That Were Included in the Original Publication by Davis14
| Dose Equivalent to 100mg Chlorpromazinea | Dose Equivalent to 1mg Olanzapineb | |
|---|---|---|
| Acetophenazine | 23.5 | 9.1 |
| Butaperazine | 8.9 | 3.5 |
| Carphenazine | 24.3 | 9.4 |
| Chlorpromazine | 100 | 38.9 |
| Chlorprothixene | 43.9 | 17.1 |
| Fluphenazine | 1.2 | 0.5 |
| Haloperidol | 1.6 | 0.6 |
| Mesoridazine | 55.3 | 21.5 |
| Perphenazine | 8.9 | 3.5 |
| Piperacetazine | 10.5 | 4.1 |
| Prochlorperazine | 14.3 | 5.6 |
| Thioridazine | 95.3 | 37.1 |
| Thiothixene | 5.2 | 2.0 |
| Trifluoperazine | 2.8 | 1.1 |
| Triflupromazine | 28.4 | 11.0 |
Note: aThis column presents the doses that are equivalent to 100 mg/d chlorpromazine according to the publication by Davis.14
bThese are olanzapine equivalents derived from our estimate of the equivalence ratio between olanzapine and chlorpromazine: 1 mg olanzapine = 38.9mg chlorpromazine or 100mg chlorpromazine = 2.572mg olanzapine.