Nokea
The point in time on the drug concentration curve that indicates the first sign of a therapeutic effect is the:
- A. Minimum adverse effect level
- B. Peak of action
- C. Onset of action
- D. Therapeutic range
Correct Answer: C
Rationale: Choice C is correct because the onset of action is when a drug first shows a therapeutic effect on the concentration curve, marking the start of its clinical impact. Choice A is incorrect as ‘minimum adverse effect level' isn't a standard term; it confuses with toxicity thresholds. Choice B is wrong because peak of action is the maximum effect, not the first sign. Choice D is incorrect since therapeutic range is the concentration window for efficacy, not a specific time point.
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Drugs that should be avoided in children include:
- A. Acetaminophen
- B. Aspirin
- C. Amoxicillin
- D. All of the above
Correct Answer: B
Rationale: Choice B is correct because aspirin is avoided in children under 16 due to its association with Reye's syndrome, a rare but serious liver and brain condition, per AAP recommendations. Choice A is incorrect as acetaminophen is safe and commonly used. Choice C is wrong because amoxicillin is a standard pediatric antibiotic with a good safety profile. Choice D is incorrect since only aspirin fits the avoidance criterion.
Drugs that should be avoided in children include:
- A. Acetaminophen
- B. Aspirin
- C. Amoxicillin
- D. All of the above
Correct Answer: B
Rationale: Choice B is correct because aspirin is avoided in children under 16 due to its association with Reye's syndrome, a rare but serious liver and brain condition, per AAP recommendations. Choice A is incorrect as acetaminophen is safe and commonly used. Choice C is wrong because amoxicillin is a standard pediatric antibiotic with a good safety profile. Choice D is incorrect since only aspirin fits the avoidance criterion.
Drugs that may cause sedation in the elderly include:
- A. Benzodiazepines
- B. Antihistamines
- C. Opioids
- D. All of the above
Correct Answer: D
Rationale: Choice D is correct because benzodiazepines (e.g., lorazepam), antihistamines (e.g., diphenhydramine), and opioids (e.g., oxycodone) all cause sedation, increasing fall risk in the elderly, per Beers Criteria. Choice A is incorrect alone as it's one class. Choice B is wrong by itself because antihistamines are just part. Choice C is incorrect solo since opioids are only one group.
Drugs that may interact with vaccines include:
- A. Immunosuppressants
- B. Antibiotics
- C. Antihistamines
- D. All of the above
Correct Answer: A
Rationale: Choice A is correct because immunosuppressants (e.g., prednisone) reduce vaccine efficacy by weakening immune response, per CDC guidelines. Choice B is incorrect as antibiotics don't typically affect vaccines. Choice C is wrong because antihistamines lack vaccine interactions. Choice D is incorrect since only immunosuppressants apply.
Upregulation or hypersensitization may lead to:
- A. Increased response to a drug
- B. Decreased response to a drug
- C. An exaggerated response if the drug is withdrawn
- D. Refractoriness or complete lack of response
Correct Answer: C
Rationale: Choice C is correct because upregulation (more receptors) or hypersensitization from chronic antagonist use can cause an exaggerated rebound response if withdrawn, as seen with beta blockers. Choice A is incorrect as increased response occurs during use, not withdrawal. Choice B is wrong because decreased response isn't typical of upregulation. Choice D is incorrect since refractoriness relates to agonists, not this scenario.