Tag: therapeutic action of different classes of drugs

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Multiple choice chemistry medicinal chemistry antacids and antihistamines therapeutic action of different classes of drugs ph regulation of the stomach

Most commonly used antacids are:

  1. weak bases

  2. strong bases

  3. weak acids

  4. strong acids
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation


Most commonly used antacids are weak bases.
Examples of antacid includes sodium bicarbonate, magnesium hydroxide, magnesium carbonate and aluminium hydroxide. An antacid is the substance which neutralizes the acid and raise the pH to an appropriate level in stomach. They should not be caustic like strong bases.

Multiple choice chemistry medicinal chemistry antacids and antihistamines therapeutic action of different classes of drugs ph regulation of the stomach

What is an antacid?

  1. The substance which neutralizes the acid and raises the pH to an appropriate level in stomach.

  2. The substance which neutralizes the acid and lowers the pH to an appropriate level in stomach.

  3. The substance which neutralizes the base and raises the pH to an appropriate level in stomach.

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An antacid is the substance which neutralizes the acid and raises the pH to an appropriate level in stomach. In other words, antacid is a base which neutralizes excess of acid in the stomach. Examples of antacid include sodium bicarbonate, magnesium hydroxide and aluminium hydroxide. They control the symptoms and not the cause.

Multiple choice chemistry medicinal chemistry antacids and antihistamines therapeutic action of different classes of drugs ph regulation of the stomach

Which of the following cannot be used as an antacid?

  1. Rantidine

  2. Cimetidine

  3. Metal hydroxides

  4. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Antacid is a drug (or medicine) preventing or correcting acidity, especially in the stomach.
To neutralize the acid in stomach, antacid should be basic in nature.
All three can be used as antacids since they are basic in nature.

Multiple choice chemistry medicinal chemistry antacids and antihistamines therapeutic action of different classes of drugs ph regulation of the stomach

Which of the following substance is an antacid?

  1. $NaCl$
  2. $Mg(OH) _2$
  3. $HCl$
  4. $H _2SO _4$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Due to its mildly basic and non-toxic nature, magnesium hydroxide is widely used as an antacid to neutralize stomach acids and prevent indigestion and heartburn. 

It is also used as a laxative, antiperspirant, underarm deodorant, to treat sores, in wastewater treatment, and as a fire retardant.

Therefore, the correct option is B.

Multiple choice chemistry medicinal chemistry antacids and antihistamines therapeutic action of different classes of drugs ph regulation of the stomach

Which of the following is not used as an antacid ? 

  1. Magnesium hydroxide

  2. Sodium carbonate

  3. Sodium bicarbonate

  4. Aluminium phosphate
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

An antacid is a substance which neutralizes stomach acidity and is used to relieve heartburn, indigestion or an upset stomach.

Example- $Mg(OH) _2, Na _2CO _3, NaHCO _3$.
Aluminum phosphate is not used as an antacid.
Hence, the correct option is D.