Promethazine with codeine 8oz Online, Promethazine is in a class of drugs call phenothiazines which also includes chlorpromazine, and trifluoperazine; however, unlike the other meds in this class, promethazine is not used as an anti-psychotic but rather as an anti-histamine, sedative, antiemetic (anti-nausea), and cough suppressant.
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