de Jonghe F E, Schalken H F, van der Helm H J
Acta Psychiatr Scand. 1976 Apr;53(4):271-6.
In a double-blind study of 44 depressive in-patients, treatment with placebo appeared to give equally good results as did treatment with thioridazine. Both treatment procedures permitted the additional prescription of chlordiazepoxide when the patient's condition indicated the need for anxiety reduction. The use of chlordiazepoxide was more frequently necessary with treatment with placebo than with treatment with thioridazine.