Introduction
Spiperone (Spiroperidol; brand name: Spiropitan (JP)) is a typical antipsychotic and research chemical belonging to the butyrophenone chemical class.

It is licensed for clinical use in Japan as a treatment for schizophrenia.
Additionally, spiperone was identified by compound screening to be an activator of Ca2+ activated Cl− channels (CaCCs), thus a potential target for therapy of cystic fibrosis.
N-Methylspiperone (NMSP) is a derivate of spiperone that is used to study the dopamine and serotonin neurotransmitter system. Labeled with the radioisotope carbon-11, it can be used for positron emission tomography.
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