Q12. Antacids and anti-allergic drugs are antihistamines, but they cannot replace each other. Explain why?
Answer: Antihistamines are the drugs that control the allergy effects produced by histamine. Antacids are substances that neutralise gastric acidity. Antihistamine does not affect the secretion of acid in the stomach, and the reason is that both anti-allergic and antacid drugs work on different receptors.
