Cases have been reported in which it was helpful to add the anticholinergic antipsychotic thioridazine for a transitory weaning period before eventually switching a patient from clozapine to another new-generation antipsychotic. This would in theory blunt the proposed increase in cholinergic tone precipitated by the removal of clozapine. However, considering the risk of QTc elevation with thioridazine, a safer alternative might be an anticholinergic antiparkinsonian drug.
Ref: - Osser, D.N. & Sigadel, R.S. (2001) Short-term inpatient pharmacotherapy of schizophrenia. Harvard Review of Psychiatry, 9, 89-104.
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This blog on Clinical Psychopharmacology is maintained by Dr. Shahul Ameen, M.D., Psychiatrist, St. John's Hospital, Kattappana, Idukki, Kerala, India.
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