Repeated USMLE Questions- Pharmacology MCQs- 296

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Q- Drug-to-drug interaction based on absorption, transformation, distribution, and excretion is considered. Which one of the following types of interaction?

A- Chemical interaction

B- Pharmaceutical interaction

C- Pharmacodynamic interaction

D- Pharmacokinetic interaction

D- Pharmacokinetic interaction- Pharmacokinetics of a drug is related to the drug’s absorption, transformation, distribution, and excretion, while pharmacodynamics deals with receptors, cells, enzymes, and organs.



Q- The effect of medications on parasympathetic function declines slowly in which one of the following organs?

A- Eye

B- Glands

C- Heart

D- Smooth muscles

A- Eye- It is clear that the effect of drugs such as atropine on parasympathetic receptors declines very slowly on the eye more than other organs.



Q- Which one of the following antihypertensive medications is directly acting vasodilator?

A- Clonidine

B- Enalapril

C- Labetalol

D- Nifedipine

D- Nifedipine- It is a calcium-channel blocker that affects the blood vessels directly and leads to vasodilation. The other drugs act indirectly through receptors.

 

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Dr Ray Makar
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2 thoughts on “Repeated USMLE Questions- Pharmacology MCQs- 296”

  1. Thank you, Dr. Abdulrazak

  2. Nifedipine- It is a calcium-channel blocker that affects the blood vessels directly and leads to vasodilation. The other drugs act indirectly through receptors.

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