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How long does it take for thorazine (chlorpromazine) to take effect.?
1 doctor weighed in

Dr. Alan Ali
Psychiatry
In brief: Thorazine (chlorpromazine)
Depending on how it is administered & the dose.
If given by intramuscular injection, effects usually within 5 minutes, by mouth it can take 15 to 30 minutes. This is for sedative effect. For psychoses, it can take up to 2-3 weeks.

In brief: Thorazine (chlorpromazine)
Depending on how it is administered & the dose.
If given by intramuscular injection, effects usually within 5 minutes, by mouth it can take 15 to 30 minutes. This is for sedative effect. For psychoses, it can take up to 2-3 weeks.
Dr. Alan Ali
Dr. Alan Ali
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