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Promethazine
A first generation antihistamine, which also possesses anticholinergic, strong sedative and antipsychotic properties. Once commonly used as a treatment for psychosis, it is now more commonly seen as a component of codeine cough syrups as an anti-nausea agent.
Dosage
Oral
Common: 25-75mg
NOTE: This is what is normally used in medicinal settings, and is usually what is prescribed to you, since it has anticholinergic properties; IE; Delirant.
Duration
Onset: 15-30 minutes
Duration: 4-8 hours
After effects: 0-3 hours
Timeline
Onset
15-30 minutes
Peak
4-8 hours
After
0-3 hours
05.8h11.5h
Typical
Extended range