Initially, up to 100 mg/day intramuscularly in divided doses.

Parenteral administration should be used only for starting therapy in patients unable or unwilling to use oral medication. The oral form should supplant the injectable as soon as possible.

Lower dosages are recommended for elderly patients and adolescents. Lower dosages are also recommended for outpatients as compared to hospitalized patients who will be under close supervision. Dosage should be initiated at a low level and increased gradually, noting carefully the clinical response and any evidence of intolerance. Following remission, oral maintenance medication may be required for a longer period of time, at the lowest dose that will maintain remission.