NBME Pharm Shelf Exam Questions with
Correct Verified Detailed Answers Updated
2025
Introduction:
This document contains a complete collection of NBME
Pharmacology Shelf exam questions with verified and detailed
answers, updated for 2025. It covers key pharmacological
mechanisms, therapeutic uses, adverse effects, antidotes, and drug
interactions across major drug classes. The material also includes
treatment guidelines, drug reactions, teratogenic effects, and high-
yield mnemonics for exam preparation. It is designed as a
comprehensive study aid for medical students preparing for the
NBME Pharmacology Shelf exam.
Exam Questions and Answers:
1: What is the mechanism of action of beta-blockers in treating
hypertension? --- correct answer ---Beta-blockers work by blocking
beta-adrenergic receptors, which reduces heart rate and cardiac
output, ultimately lowering blood pressure.
,2: Which class of diuretics is most effective in treating acute
pulmonary edema? --- correct answer ---
Loop diuretics, such as furosemide, are most effective in treating
acute pulmonary edema due to their potent diuretic effect.
3: What is the primary adverse effect associated with
aminoglycoside antibiotics? --- correct answer ---
The primary adverse effects of aminoglycosides include
nephrotoxicity and ototoxicity.
4: How do proton pump inhibitors (PPIs) reduce gastric acid
secretion? --- correct answer ---PPIs irreversibly inhibit the HK+
ATPase enzyme in the gastric parietal cells, leading to a significant
reduction in acid secretion.
5: What is the therapeutic use of methotrexate in rheumatoid
arthritis? --- correct answer ---Methotrexate is used as a disease-
modifying antirheumatic drug (DMARD) to reduce inflammation
and slow disease progression in rheumatoid arthritis.
6: Which anticoagulant is preferred during pregnancy and why? ---
correct answer ---
Heparin is preferred during pregnancy because it does not cross the
placenta, reducing the risk of fetal complications.
,7: What is the antidote for acetaminophen overdose? --- correct
answer ---
N-acetylcysteine is the antidote for acetaminophen overdose, as it
replenishes glutathione and helps prevent liver damage.
8: How do statins lower cholesterol levels? --- correct answer ---
Statins inhibit HMG-CoA reductase, an enzyme involved in
cholesterol synthesis, leading to decreased cholesterol levels and
increased LDL receptor expression.
9: What is the mechanism of action of benzodiazepines in treating
anxiety? --- correct answer ---Benzodiazepines enhance the effect
of the neurotransmitter GABA by binding to the GABA-A receptor,
leading to increased neuronal inhibition and reduced anxiety.
10: What is the most common side effect of ACE inhibitors? ---
correct answer ---
The most common side effect of ACE inhibitors is a persistent dry
cough.
11: Which medication is used to reverse the effects of opioid
overdose? --- correct answer ---Naloxone is used to reverse opioid
overdose by competitively binding to opioid receptors, displacing
the opioid.
, 12: How does metformin help in managing type 2 diabetes? ---
correct answer ---
Metformin decreases hepatic glucose production, increases insulin
sensitivity, and enhances peripheral glucose uptake.
13: What is the role of allopurinol in the management of gout? ---
correct answer ---Allopurinol inhibits xanthine oxidase, reducing
uric acid production and preventing gout attacks.
14: Which antibiotic is known for causing a disulfiram-like reaction
when taken with alcohol? --- correct answer ---
Metronidazole can cause a disulfiram-like reaction when consumed
with alcohol, leading to nausea and flushing.
15: What is the mechanism of action of selective serotonin reuptake
inhibitors (SSRIs)? --- correct answer ---
SSRIs block the reuptake of serotonin into presynaptic neurons,
increasing serotonin availability in the synaptic cleft.
16: Why is digoxin used in the treatment of atrial fibrillation? ---
correct answer ---
Digoxin increases vagal tone and decreases conduction through the
AV node, helping to control the ventricular rate in atrial fibrillation.
Correct Verified Detailed Answers Updated
2025
Introduction:
This document contains a complete collection of NBME
Pharmacology Shelf exam questions with verified and detailed
answers, updated for 2025. It covers key pharmacological
mechanisms, therapeutic uses, adverse effects, antidotes, and drug
interactions across major drug classes. The material also includes
treatment guidelines, drug reactions, teratogenic effects, and high-
yield mnemonics for exam preparation. It is designed as a
comprehensive study aid for medical students preparing for the
NBME Pharmacology Shelf exam.
Exam Questions and Answers:
1: What is the mechanism of action of beta-blockers in treating
hypertension? --- correct answer ---Beta-blockers work by blocking
beta-adrenergic receptors, which reduces heart rate and cardiac
output, ultimately lowering blood pressure.
,2: Which class of diuretics is most effective in treating acute
pulmonary edema? --- correct answer ---
Loop diuretics, such as furosemide, are most effective in treating
acute pulmonary edema due to their potent diuretic effect.
3: What is the primary adverse effect associated with
aminoglycoside antibiotics? --- correct answer ---
The primary adverse effects of aminoglycosides include
nephrotoxicity and ototoxicity.
4: How do proton pump inhibitors (PPIs) reduce gastric acid
secretion? --- correct answer ---PPIs irreversibly inhibit the HK+
ATPase enzyme in the gastric parietal cells, leading to a significant
reduction in acid secretion.
5: What is the therapeutic use of methotrexate in rheumatoid
arthritis? --- correct answer ---Methotrexate is used as a disease-
modifying antirheumatic drug (DMARD) to reduce inflammation
and slow disease progression in rheumatoid arthritis.
6: Which anticoagulant is preferred during pregnancy and why? ---
correct answer ---
Heparin is preferred during pregnancy because it does not cross the
placenta, reducing the risk of fetal complications.
,7: What is the antidote for acetaminophen overdose? --- correct
answer ---
N-acetylcysteine is the antidote for acetaminophen overdose, as it
replenishes glutathione and helps prevent liver damage.
8: How do statins lower cholesterol levels? --- correct answer ---
Statins inhibit HMG-CoA reductase, an enzyme involved in
cholesterol synthesis, leading to decreased cholesterol levels and
increased LDL receptor expression.
9: What is the mechanism of action of benzodiazepines in treating
anxiety? --- correct answer ---Benzodiazepines enhance the effect
of the neurotransmitter GABA by binding to the GABA-A receptor,
leading to increased neuronal inhibition and reduced anxiety.
10: What is the most common side effect of ACE inhibitors? ---
correct answer ---
The most common side effect of ACE inhibitors is a persistent dry
cough.
11: Which medication is used to reverse the effects of opioid
overdose? --- correct answer ---Naloxone is used to reverse opioid
overdose by competitively binding to opioid receptors, displacing
the opioid.
, 12: How does metformin help in managing type 2 diabetes? ---
correct answer ---
Metformin decreases hepatic glucose production, increases insulin
sensitivity, and enhances peripheral glucose uptake.
13: What is the role of allopurinol in the management of gout? ---
correct answer ---Allopurinol inhibits xanthine oxidase, reducing
uric acid production and preventing gout attacks.
14: Which antibiotic is known for causing a disulfiram-like reaction
when taken with alcohol? --- correct answer ---
Metronidazole can cause a disulfiram-like reaction when consumed
with alcohol, leading to nausea and flushing.
15: What is the mechanism of action of selective serotonin reuptake
inhibitors (SSRIs)? --- correct answer ---
SSRIs block the reuptake of serotonin into presynaptic neurons,
increasing serotonin availability in the synaptic cleft.
16: Why is digoxin used in the treatment of atrial fibrillation? ---
correct answer ---
Digoxin increases vagal tone and decreases conduction through the
AV node, helping to control the ventricular rate in atrial fibrillation.
