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Question

Which of the following compounds is not an antacid?


A

Cimetidine

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B

Ranitidine

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C

Aluminium hydroxide

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D

Phenelzine

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Solution

The correct option is D

Phenelzine


The explanation of the correct option:

D) Phenelzine

  • An antacid is a drug used for curing acidity or neutralizing the excess acid formation in the stomach, indigestion, and heartburn. They come in the form of solid tablets or liquid form as well and are taken orally.
  • Phenelzine is an anti-depressant.
  • Anti-depressants are used in treating depression. Although it doesn't cure depression, it has a temporary effect given to reduce the effects of depression. They can only be taken with a doctor's prescription.
  • Phenelzine is an anti-depressant under the class of medications called monoamine oxidase inhibitors (MAOIs). It works by increasing the amounts of certain substances(Monoamine oxidase) in the central nervous system that are needed to maintain mental balance and is a temporary effect only.

The explanation for the incorrect options:

A) Cimetidine

  • Cimetidine is an antihistamine used in the prevention of stomach ulcers and acidity.
  • Antihistamine describes a class of drugs that opposes the activity of histamine receptors in the body.
  • Cimetidine is in a class of medications calledH2 blockers and is a histamine H2receptor antagonist which inhibits stomach acid production.

B) Ranitidine

  • It is used to decrease the acidity in the stomach and is an antacid.
  • It is sold under the common name Zantac, a very common tablet of ranitidine.
  • It is also used in treating peptic ulcer disease, gastroesophageal reflux disease, and Zollinger–Ellison syndrome.

C) Aluminium Hydroxide

  • It is an antacid used for humans and animals use.
  • It is preferred over sodium bicarbonate because it doesn't trigger stomach acid and is insoluble.

Hence, option D) Phenelzine is the correct option.


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