Narcotic analgesics cause histamine release, which appears to become to blame for wheals or urticaria sometimes seen at the positioning of injection on parenteral administration. Promethazine has an elimination half-life of ten-fourteen hours, with excretion of metabolites showing up in the urine and feces. The sulfoxides of promethazine and N-demethylpromethazine https://yeepdirectory.com/listings13151901/considerations-to-know-about-akorn-promethazine-with-codeine-syrup