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Promethazine is metabolized by the liver to various compounds; the sulfoxides of promethazine and N-demethylpromethazine would be the predominant metabolites showing during the urine.The common effective dose of Promethazine for the Lively therapy of nausea and vomiting in children or Grownups is 25 mg.Promethazine Promethazine competitively antago