PTCB Practice Test: Video 3 Answers (25 Questions)

Question 1

Which drug is a direct-acting oral anticoagulant (DOAC) that inhibits Factor Xa?

Accepted Answer

Rivaroxaban

Answer

Rivaroxaban (Xarelto) is a direct Factor Xa inhibitor used for stroke prevention and DVT/PE treatment.

Question 2

What is the mechanism of action of NSAIDs?

Accepted Answer

Inhibit COX enzymes to reduce prostaglandin synthesis

Answer

NSAIDs work by inhibiting cyclooxygenase (COX-1 and COX-2) enzymes, reducing the production of prostaglandins that cause pain and inflammation.

Question 3

What is the term for the time it takes for a drug's plasma concentration to decrease by 50%?

Accepted Answer

Half-life

Answer

The half-life (t½) is the time required for the drug concentration in the plasma to decrease by half, determining dosing intervals.

Question 4

Which electrolyte imbalance is a common side effect of loop diuretics like furosemide?

Accepted Answer

Hypokalemia

Answer

Loop diuretics cause increased urinary excretion of potassium, leading to hypokalemia (low blood potassium levels).

Question 5

What is the primary adverse effect that limits the use of aminoglycoside antibiotics?

Accepted Answer

Nephrotoxicity and ototoxicity

Answer

Aminoglycosides (gentamicin, tobramycin) carry significant risk of nephrotoxicity (kidney damage) and ototoxicity (hearing loss), requiring level monitoring.

PTCB - Pharmacy Technician Certification Board Practice Test

PTCB - Pharmacy Technician Certification Board Practice Test

PTCB Practice Test: Video 3 Answers (25 Questions)