The authors have studied the action of high doses of Haldol in chronic schizophrenics in a study lasting more than five months and compared their results to a study done at the Eastern State hospital of Williamburg in Virginia (U.S., Howard). The daily doses of 75 mg caused a remission in 4 schizophrenics, and 19 patients were improved in a sample of 38 patients. The medication was given to a group exposed to neuroleptics only, without differences between the two groups. The authors have carried out the study for more than one year without observing changes in biological tests, using a dayly dose of 60 mg. Five patients out of nine were improved and could be discharged to return to their family or society with the appropriate affective follow-up.