Academic Year 2026–2027 Pharmacology Updated 2026 | 190+ Exam
Questions and Answers | Comprehensive Study Guide, Practice Exam,
Pharmacology Test Bank, Medication Administration Review, Drug
Classifications, Pharmacokinetics, Pharmacodynamics, Adverse Drug
Reactions, Safe Medication Practices, Dosage Calculations, Patient
Education, NCLEX Preparation, Detailed Rationales and Exam Prep
Revision Material
Question 1: A patient with severe sepsis is prescribed a medication that inhibits
bacterial protein synthesis by binding to the 30S ribosomal subunit. Which of the
following adverse effects is most specifically associated with this class of
antibiotics?
A. Ototoxicity
B. Tendon rupture
C. Nephrotoxicity
D. Photosensitivity
CORRECT ANSWER: C. Nephrotoxicity
Rationale: The medication described is an aminoglycoside (e.g., gentamicin).
Aminoglycosides bind to the 30S ribosomal subunit, causing misreading of mRNA. A
hallmark adverse effect of this class is nephrotoxicity, primarily due to accumulation in
proximal tubular cells. Ototoxicity is also an adverse effect, but nephrotoxicity is a more
specific and classic major toxicity of aminoglycosides. Tendon rupture is associated
with fluoroquinolones, and photosensitivity with tetracyclines.
Question 2: A 60-year-old patient with a history of myocardial infarction is started
on a medication that inhibits the angiotensin-converting enzyme (ACE). Which of
the following is the primary mechanism by which this medication reduces preload
and afterload?
A. Decreased vasopressin release
B. Increased bradykinin levels leading to peripheral vasodilation
C. Reduced conversion of angiotensin I to angiotensin II
D. Direct antagonism of angiotensin II receptors
CORRECT ANSWER: C. Reduced conversion of angiotensin I to angiotensin II
Rationale: ACE inhibitors (e.g., lisinopril) work primarily by blocking the conversion of
angiotensin I to angiotensin II. This reduces angiotensin II-mediated vasoconstriction
(afterload) and aldosterone release, which decreases sodium and water retention
(preload). While bradykinin levels do increase and contribute to vasodilation, the
primary therapeutic mechanism is the reduction of angiotensin II formation. Direct
antagonism is the mechanism of ARBs.
,Question 3: A patient on a selective serotonin reuptake inhibitor (SSRI) for major
depressive disorder reports severe anxiety and restlessness. What is the most
likely adverse effect being experienced?
A. Akathisia
B. Serotonin syndrome
C. Neuroleptic malignant syndrome
D. Tardive dyskinesia
CORRECT ANSWER: A. Akathisia
Rationale: Akathisia is a movement disorder characterized by a feeling of inner
restlessness and the urge to move constantly. It is a well-known adverse effect of SSRIs.
Serotonin syndrome is more severe and includes hyperthermia, autonomic instability,
and muscle rigidity. Neuroleptic malignant syndrome is associated with antipsychotics,
and tardive dyskinesia is a late-onset movement disorder also associated with
antipsychotics.
Question 4: A 45-year-old woman is diagnosed with a urinary tract infection. She is
allergic to penicillins. Which of the following antibiotics should be avoided due to a
high risk of cross-reactivity?
A. Ciprofloxacin
B. Ceftriaxone
C. Doxycycline
D. Trimethoprim-sulfamethoxazole
CORRECT ANSWER: B. Ceftriaxone
Rationale: Ceftriaxone is a third-generation cephalosporin. Cephalosporins share a
beta-lactam ring with penicillins, leading to a risk of cross-reactivity, especially in
patients with a history of an immediate hypersensitivity reaction to penicillins. The risk
is relatively low (about 1-3%), but it is generally recommended to avoid them if the
allergy was severe. The other options are safe to use in most penicillin-allergic patients.
Question 5: A patient is prescribed warfarin for atrial fibrillation. Which of the
following herbal supplements should the patient be warned against taking because
it significantly increases the risk of bleeding?
A. St. John's Wort
B. Echinacea
C. Ginkgo biloba
D. Goldenseal
CORRECT ANSWER: C. Ginkgo biloba
Rationale: Ginkgo biloba has antiplatelet properties and can increase the risk of
bleeding when taken with warfarin, an anticoagulant. St. John's Wort decreases the
,effectiveness of warfarin by inducing CYP450 enzymes. Echinacea and Goldenseal have
weaker or less established interactions regarding bleeding risk with warfarin.
Question 6: A patient with asthma is prescribed a long-acting beta-2 agonist (LABA).
Which of the following is the most important boxed warning associated with this
class of medications?
A. Hepatotoxicity
B. Increased risk of asthma-related death
C. Nephrotoxicity
D. Prolonged QT interval
CORRECT ANSWER: B. Increased risk of asthma-related death
Rationale: LABAs (e.g., salmeterol, formoterol) carry a black box warning for an
increased risk of asthma-related death, based on the SMART study. To mitigate this risk,
LABAs are only recommended for use in asthma patients who are not adequately
controlled on inhaled corticosteroids and should always be used in combination with
an inhaled corticosteroid.
Question 7: A 70-year-old male with benign prostatic hyperplasia (BPH) is
prescribed tamsulosin. Which of the following adverse effects is most likely to
occur in this patient?
A. Orthostatic hypotension
B. Gynecomastia
C. Erectile dysfunction
D. Dry mouth
CORRECT ANSWER: A. Orthostatic hypotension
Rationale: Tamsulosin is an alpha-1 blocker used to treat BPH. The primary adverse
effect is orthostatic hypotension, due to the non-selective blockade of alpha-1
receptors in vascular smooth muscle. Dizziness and syncope are common.
Gynecomastia and erectile dysfunction are more associated with 5-alpha-reductase
inhibitors (e.g., finasteride). Dry mouth is more associated with alpha-2 agonists or
anticholinergics.
Question 8: A patient is receiving vancomycin for a methicillin-resistant
Staphylococcus aureus (MRSA) infection. Which of the following adverse effects is
of most concern and requires therapeutic drug monitoring?
A. Hepatotoxicity
B. Ototoxicity and Nephrotoxicity
C. Cardiotoxicity
D. Pulmonary toxicity
CORRECT ANSWER: B. Ototoxicity and Nephrotoxicity
, Rationale: Vancomycin is associated with nephrotoxicity and ototoxicity. Due to the
narrow therapeutic index, serum levels of vancomycin must be monitored to prevent
these adverse effects. Trough levels are typically measured to ensure efficacy and
minimize toxicity. The other options are not primary toxicities of vancomycin.
Question 9: A patient with a history of tuberculosis is prescribed isoniazid. Which
of the following vitamin deficiencies is most commonly associated with this
medication, potentially causing peripheral neuropathy?
A. Vitamin B12
B. Vitamin B6 (Pyridoxine)
C. Vitamin C
D. Vitamin D
CORRECT ANSWER: B. Vitamin B6 (Pyridoxine)
Rationale: Isoniazid (INH) inhibits the enzyme pyridoxal kinase, leading to a deficiency
of pyridoxine (Vitamin B6). This deficiency can cause peripheral neuropathy. It is
standard practice to administer pyridoxine supplementation prophylactically in patients
receiving INH to prevent this adverse effect.
Question 10: The antidote for a patient experiencing a toxic dose of acetaminophen
is:
A. Flumazenil
B. Naloxone
C. Acetylcysteine
D. Atropine
CORRECT ANSWER: C. Acetylcysteine
Rationale: Acetylcysteine is the specific antidote for acetaminophen toxicity. It works
by replenishing glutathione stores in the liver, allowing for the safe metabolism of the
toxic intermediate (NAPQI) formed from acetaminophen overdose. Flumazenil is for
benzodiazepines, Naloxone for opioids, and Atropine for organophosphates and
bradycardia.
Question 11: A patient on metformin for type 2 diabetes is scheduled for a CT scan
with intravenous contrast. Which of the following is the most important action
regarding metformin administration?
A. Continue metformin as usual
B. Double the dose of metformin
C. Hold metformin for 48 hours before the procedure
D. Hold metformin at the time of the procedure and for 48 hours afterward
CORRECT ANSWER: D. Hold metformin at the time of the procedure and for 48
hours afterward
Questions and Answers | Comprehensive Study Guide, Practice Exam,
Pharmacology Test Bank, Medication Administration Review, Drug
Classifications, Pharmacokinetics, Pharmacodynamics, Adverse Drug
Reactions, Safe Medication Practices, Dosage Calculations, Patient
Education, NCLEX Preparation, Detailed Rationales and Exam Prep
Revision Material
Question 1: A patient with severe sepsis is prescribed a medication that inhibits
bacterial protein synthesis by binding to the 30S ribosomal subunit. Which of the
following adverse effects is most specifically associated with this class of
antibiotics?
A. Ototoxicity
B. Tendon rupture
C. Nephrotoxicity
D. Photosensitivity
CORRECT ANSWER: C. Nephrotoxicity
Rationale: The medication described is an aminoglycoside (e.g., gentamicin).
Aminoglycosides bind to the 30S ribosomal subunit, causing misreading of mRNA. A
hallmark adverse effect of this class is nephrotoxicity, primarily due to accumulation in
proximal tubular cells. Ototoxicity is also an adverse effect, but nephrotoxicity is a more
specific and classic major toxicity of aminoglycosides. Tendon rupture is associated
with fluoroquinolones, and photosensitivity with tetracyclines.
Question 2: A 60-year-old patient with a history of myocardial infarction is started
on a medication that inhibits the angiotensin-converting enzyme (ACE). Which of
the following is the primary mechanism by which this medication reduces preload
and afterload?
A. Decreased vasopressin release
B. Increased bradykinin levels leading to peripheral vasodilation
C. Reduced conversion of angiotensin I to angiotensin II
D. Direct antagonism of angiotensin II receptors
CORRECT ANSWER: C. Reduced conversion of angiotensin I to angiotensin II
Rationale: ACE inhibitors (e.g., lisinopril) work primarily by blocking the conversion of
angiotensin I to angiotensin II. This reduces angiotensin II-mediated vasoconstriction
(afterload) and aldosterone release, which decreases sodium and water retention
(preload). While bradykinin levels do increase and contribute to vasodilation, the
primary therapeutic mechanism is the reduction of angiotensin II formation. Direct
antagonism is the mechanism of ARBs.
,Question 3: A patient on a selective serotonin reuptake inhibitor (SSRI) for major
depressive disorder reports severe anxiety and restlessness. What is the most
likely adverse effect being experienced?
A. Akathisia
B. Serotonin syndrome
C. Neuroleptic malignant syndrome
D. Tardive dyskinesia
CORRECT ANSWER: A. Akathisia
Rationale: Akathisia is a movement disorder characterized by a feeling of inner
restlessness and the urge to move constantly. It is a well-known adverse effect of SSRIs.
Serotonin syndrome is more severe and includes hyperthermia, autonomic instability,
and muscle rigidity. Neuroleptic malignant syndrome is associated with antipsychotics,
and tardive dyskinesia is a late-onset movement disorder also associated with
antipsychotics.
Question 4: A 45-year-old woman is diagnosed with a urinary tract infection. She is
allergic to penicillins. Which of the following antibiotics should be avoided due to a
high risk of cross-reactivity?
A. Ciprofloxacin
B. Ceftriaxone
C. Doxycycline
D. Trimethoprim-sulfamethoxazole
CORRECT ANSWER: B. Ceftriaxone
Rationale: Ceftriaxone is a third-generation cephalosporin. Cephalosporins share a
beta-lactam ring with penicillins, leading to a risk of cross-reactivity, especially in
patients with a history of an immediate hypersensitivity reaction to penicillins. The risk
is relatively low (about 1-3%), but it is generally recommended to avoid them if the
allergy was severe. The other options are safe to use in most penicillin-allergic patients.
Question 5: A patient is prescribed warfarin for atrial fibrillation. Which of the
following herbal supplements should the patient be warned against taking because
it significantly increases the risk of bleeding?
A. St. John's Wort
B. Echinacea
C. Ginkgo biloba
D. Goldenseal
CORRECT ANSWER: C. Ginkgo biloba
Rationale: Ginkgo biloba has antiplatelet properties and can increase the risk of
bleeding when taken with warfarin, an anticoagulant. St. John's Wort decreases the
,effectiveness of warfarin by inducing CYP450 enzymes. Echinacea and Goldenseal have
weaker or less established interactions regarding bleeding risk with warfarin.
Question 6: A patient with asthma is prescribed a long-acting beta-2 agonist (LABA).
Which of the following is the most important boxed warning associated with this
class of medications?
A. Hepatotoxicity
B. Increased risk of asthma-related death
C. Nephrotoxicity
D. Prolonged QT interval
CORRECT ANSWER: B. Increased risk of asthma-related death
Rationale: LABAs (e.g., salmeterol, formoterol) carry a black box warning for an
increased risk of asthma-related death, based on the SMART study. To mitigate this risk,
LABAs are only recommended for use in asthma patients who are not adequately
controlled on inhaled corticosteroids and should always be used in combination with
an inhaled corticosteroid.
Question 7: A 70-year-old male with benign prostatic hyperplasia (BPH) is
prescribed tamsulosin. Which of the following adverse effects is most likely to
occur in this patient?
A. Orthostatic hypotension
B. Gynecomastia
C. Erectile dysfunction
D. Dry mouth
CORRECT ANSWER: A. Orthostatic hypotension
Rationale: Tamsulosin is an alpha-1 blocker used to treat BPH. The primary adverse
effect is orthostatic hypotension, due to the non-selective blockade of alpha-1
receptors in vascular smooth muscle. Dizziness and syncope are common.
Gynecomastia and erectile dysfunction are more associated with 5-alpha-reductase
inhibitors (e.g., finasteride). Dry mouth is more associated with alpha-2 agonists or
anticholinergics.
Question 8: A patient is receiving vancomycin for a methicillin-resistant
Staphylococcus aureus (MRSA) infection. Which of the following adverse effects is
of most concern and requires therapeutic drug monitoring?
A. Hepatotoxicity
B. Ototoxicity and Nephrotoxicity
C. Cardiotoxicity
D. Pulmonary toxicity
CORRECT ANSWER: B. Ototoxicity and Nephrotoxicity
, Rationale: Vancomycin is associated with nephrotoxicity and ototoxicity. Due to the
narrow therapeutic index, serum levels of vancomycin must be monitored to prevent
these adverse effects. Trough levels are typically measured to ensure efficacy and
minimize toxicity. The other options are not primary toxicities of vancomycin.
Question 9: A patient with a history of tuberculosis is prescribed isoniazid. Which
of the following vitamin deficiencies is most commonly associated with this
medication, potentially causing peripheral neuropathy?
A. Vitamin B12
B. Vitamin B6 (Pyridoxine)
C. Vitamin C
D. Vitamin D
CORRECT ANSWER: B. Vitamin B6 (Pyridoxine)
Rationale: Isoniazid (INH) inhibits the enzyme pyridoxal kinase, leading to a deficiency
of pyridoxine (Vitamin B6). This deficiency can cause peripheral neuropathy. It is
standard practice to administer pyridoxine supplementation prophylactically in patients
receiving INH to prevent this adverse effect.
Question 10: The antidote for a patient experiencing a toxic dose of acetaminophen
is:
A. Flumazenil
B. Naloxone
C. Acetylcysteine
D. Atropine
CORRECT ANSWER: C. Acetylcysteine
Rationale: Acetylcysteine is the specific antidote for acetaminophen toxicity. It works
by replenishing glutathione stores in the liver, allowing for the safe metabolism of the
toxic intermediate (NAPQI) formed from acetaminophen overdose. Flumazenil is for
benzodiazepines, Naloxone for opioids, and Atropine for organophosphates and
bradycardia.
Question 11: A patient on metformin for type 2 diabetes is scheduled for a CT scan
with intravenous contrast. Which of the following is the most important action
regarding metformin administration?
A. Continue metformin as usual
B. Double the dose of metformin
C. Hold metformin for 48 hours before the procedure
D. Hold metformin at the time of the procedure and for 48 hours afterward
CORRECT ANSWER: D. Hold metformin at the time of the procedure and for 48
hours afterward
