This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
H1 antagonist has all the functins except ? 
Select and explain. 
A. Antipruritic, B. Sedation, C. Decrease gastric acid secretion, D. Antiveigo
C: Decrease gastric acid secretion
Answer: C: Decrease gastric acid secretion 
Explanation: 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.