Pharmacology MCQs- 264

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Q- Dry or “sandy eyes” is seen after administration of large doses of which one of the following medications?

A- Atropine

B- Carbachol

C- Pilocarpine

D- Timolol

A- Atropine- Atropine blocks muscarinic receptors and reduces lacrimal gland secretion, leading to dry eyes or a “sandy eyes” sensation. Carbachol and pilocarpine increase tear production, and timolol does not cause significant dryness.



Q- Which of the following statements correctly describes the therapeutic dose of medication?

A- The amount of medication that produces the maximal rate of distribution

B- The amount of medication that produces minimal biological effect

C- The amount of medication that produces the highest plasma concentration of the drug

D- The amount of medication that produces the required effect in the majority of patients

D- The amount of medication that produces the required effect in the majority of patients- The therapeutic dose is defined as the dose that achieves the desired clinical effect in most patients. It is not related to maximal distribution, minimal effect, or highest plasma concentration
.



Q- Which of the following medications is considered irreversible alpha receptor antagonist?

A- Labetalol

B- Phenoxybenzamine

C- Prazosin

D- Tolazoline

B- Phenoxybenzamine- Phenoxybenzamine is an irreversible (noncompetitive) alpha-adrenergic antagonist, commonly used in pheochromocytoma. The others are reversible alpha blockers.

 

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