<prompt> H1 antagonist has all the functins except ?AntipruriticSedationDecrease gastric acid secretionAntiveigo  <response>: Ans. is c i.e., Decrease gastric acid secretion o Gastric acid secretion is H2 receptors, thus H2-antagonists not H1 antagonists decrease gastric acid secretion. o H1- antihistaminics are used in idiopathic pruritis as antipruritic and veigo cinnarizine. o H1-antihistaminics cause sedation. 