Bowers M B
Am J Psychiatry. 1984 Feb;141(2):296-8. doi: 10.1176/ajp.141.2.296.
In 24 patients receiving neuroleptics, the 11 patients whose CSF homovanillic acid showed no tolerance to neuroleptics at 1 month had significantly more residual symptoms, extrapyramidal side effects, and history of psychiatric hospitalization in first-degree relatives.