Promethazine operates on histamine-1 (H1) receptors. H1 receptors are existing while in the bronchial tubes and inside the circulatory process. The attachment of histamine to those receptors brings about bronchoconstriction and improved vascular permeability, which ends up in plasma leakage. Due to inconsistencies between the drug labels on DailyMed plus https://josefad555hcw9.yourkwikimage.com/user