Question

Cimetidine acts by blocking:

• A. \( \text{Na-H-ATPase} \)
• B. \( \text{Na-K ATPase} \)
• C. \( \text{H2 receptor} \)
• D. \( \text{H1 receptor} \)

Hint:

H\(_2\) receptor antagonists are distinct from H\(_1\) blockers, which are primarily used for allergy treatment.

Answer 1

The Correct Option is C

Cimetidine is a histamine H\(_2\) receptor antagonist that reduces stomach acid production. It inhibits the action of histamine on H\(_2\) receptors present in gastric parietal cells, thereby reducing acid secretion. Cimetidine is commonly used to treat conditions such as gastroesophageal reflux disease (GERD) and peptic ulcers.