Question

Which of the following compounds is not an antacid?

• A. Aluminium hydroxide
• B. Cimetidine
• C. Phenelzine
• D. Ranitidine

Answer 1

The Correct Option is C

To determine which of the given compounds is not an antacid, let's consider the properties and uses of each compound mentioned:

1. Aluminium Hydroxide: This compound is commonly used as an antacid. It neutralizes stomach acid and is often used to relieve symptoms of indigestion and heartburn.
2. Cimetidine: Cimetidine is a type of H₂ receptor antagonist, which reduces stomach acid production. Though not a traditional antacid, it serves a similar purpose by decreasing acidity in the stomach, typically used for treating ulcers and gastroesophageal reflux disease (GERD).
3. Phenelzine: This is an antidepressant medication and works as a monoamine oxidase inhibitor (MAOI). It is not related to treating any conditions involving stomach acid. Thus, Phenelzine is not an antacid.
4. Ranitidine: Similar to Cimetidine, Ranitidine is also an H₂ receptor antagonist that decreases acid production in the stomach, used for conditions like heartburn and GERD.

From the above analysis, it is evident that Phenelzine does not function as an antacid. Instead, it is used as an antidepressant. Therefore, the correct answer is:

Phenelzine