AMCA AMCA Pharmacology 4

Question 1

Which drug classification is most commonly associated with the risk of Stevens-Johnson syndrome?

Accepted Answer

Sulfonamide antibiotics

Answer

Sulfonamide antibiotics (sulfa drugs) are among the most common causes of Stevens-Johnson syndrome, a severe skin reaction.

Question 2

A patient is prescribed warfarin. Which vitamin directly antagonizes warfarin's mechanism of action?

Accepted Answer

Vitamin K

Answer

Vitamin K is required for the synthesis of clotting factors that warfarin inhibits, so it directly antagonizes warfarin's anticoagulant effect.

Question 3

Which of the following is the antidote for acetaminophen overdose?

Accepted Answer

N-acetylcysteine

Answer

N-acetylcysteine (NAC) replenishes glutathione stores and prevents liver damage from toxic acetaminophen metabolites.

Question 4

A medication labeled 'PRN' should be administered:

Accepted Answer

Only as needed by the patient

Answer

PRN (pro re nata) is a Latin term meaning 'as needed,' so the medication is given only when the patient requires it.

Question 5

Which electrolyte imbalance is a major concern when administering loop diuretics such as furosemide?

Accepted Answer

Hypokalemia

Answer

Loop diuretics increase urinary excretion of potassium, placing patients at risk for hypokalemia.

(AMCA) American Medical Certification Association Practice Test