Wikipedia: Phenothiazine

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Phenothiazines are antipsychotic drugs. There are three groups:
*I - Aliphatic compounds have a strong sedative effect, but moderate extrapyramidal and autonomic effects.
*II - Piperidines have moderate sedative effects and fewer extrapyramidal effects than aliphatic compounds, but more autonomic effects.
*III - Piperazines have few sedative effects, pronounced extrapyramidal effects, and less autonomic effects.

Phenothiazines are antipsychotic drugs. There are three groups different by their chemical structure and their pharmacological effects:

Group	Sedative	Extrapyramidal	Autonomic
Aliphatic compounds	strong	moderate	moderate
Piperidines	moderate	weak	strong
Piperazines	weak	strong	weak

Phenothiazines are antipsychotic drugs. There are three groups different by their chemical structure and their pharmacological effects:

Group	Sedative	Extrapyramidal	Autonomic
Aliphatic compounds	strong	moderate	moderate
Piperidines	moderate	weak	strong
Piperazines	weak	strong	weak