ATC Pharmacology 4 — Questions and Answers
Question 1: Which term describes when two drugs are combined and produce an effect greater than the sum of their individual effects?
- Antagonism
- Additive effect
- Synergism (Correct answer)
- Tolerance
Correct answer: Synergism
Synergism (or potentiation) occurs when combined drugs produce a response exceeding the sum of their separate effects.
Question 2: An athlete using a nicotine patch to quit smoking asks if it will affect performance. Which physiological effect of nicotine is most relevant to athletic performance?
- Decreased resting heart rate
- Peripheral vasodilation
- Increased catecholamine release causing elevated heart rate and blood pressure (Correct answer)
- Reduced oxygen-carrying capacity
Correct answer: Increased catecholamine release causing elevated heart rate and blood pressure
Nicotine stimulates catecholamine release, increasing heart rate, blood pressure, and myocardial oxygen demand.
Question 3: Which of the following best defines a drug's half-life?
- The time for a drug to reach its peak plasma concentration
- The time required for the plasma concentration of a drug to decrease by 50% (Correct answer)
- The duration of a drug's therapeutic effect
- The time needed for a drug to be fully absorbed
Correct answer: The time required for the plasma concentration of a drug to decrease by 50%
Half-life is the time required for the concentration of a drug in the bloodstream to decrease by half.
Question 4: An athlete develops hives and wheezing shortly after being given an oral antibiotic. What is the most appropriate immediate intervention?
- Administer an oral antihistamine and monitor
- Administer epinephrine 1:1000 IM and activate EMS (Correct answer)
- Apply a cold pack to reduce localized reaction
- Give oral corticosteroids and reassess in 30 minutes
Correct answer: Administer epinephrine 1:1000 IM and activate EMS
Signs of anaphylaxis require immediate intramuscular epinephrine and activation of emergency medical services.
Question 5: Beta-blockers are prohibited in which sports primarily because of their performance-enhancing calming and anti-tremor effects?
- Track and field and swimming
- Archery and shooting sports (Correct answer)
- Weightlifting and wrestling
- Football and basketball
Correct answer: Archery and shooting sports
Beta-blockers reduce tremor and heart rate, providing a significant performance advantage in precision sports like archery and shooting.
Question 6: An athletic trainer is reviewing a prescription label that reads 'take 500 mg q8h.' How many milligrams would the athlete consume per day?
- 1000 mg
- 1500 mg (Correct answer)
- 2000 mg
- 2500 mg
Correct answer: 1500 mg
Q8h means every 8 hours, resulting in 3 doses per day; 3 × 500 mg = 1500 mg daily.
Question 7: Which vitamin or mineral supplement is most commonly implicated in adverse drug interactions with anticoagulants like warfarin?
- Vitamin C
- Zinc
- Vitamin K (Correct answer)
- Magnesium
Correct answer: Vitamin K
Vitamin K directly antagonizes warfarin's mechanism by supporting clotting factor synthesis, altering anticoagulation control.
ATC Pharmacology 4
Which term describes when two drugs are combined and produce an effect greater than the sum of their individual effects?