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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.