PHARMACOLOGY AND CLINICAL
PHARMACY – SET 2 (QUESTIONS
1–100) – 2026 LATEST UPDATE –
VERIFIED ANSWERS WITH
RATIONALES – A+ GRADE
Subject: Pharmacology and Clinical Pharmacy
Direction: Choose the letter of the BEST answer. Each
question is worth 1 point.
1. Opioid receptors mostly involved in pain are:
A. Mu receptors
B. Kappa receptors
C. Y receptors
D. Omega-3 receptors
Correct Answer: A. Mu receptors.
Rationale: Mu (μ) receptors are the primary opioid
receptors involved in analgesia, respiratory depression,
euphoria, and physical dependence. Kappa receptors also
contribute to analgesia but are less involved in pain
modulation. Y and Omega-3 receptors are not opioid
receptors.
2. A 23-year-old woman who underwent an open
appendectomy is later found to have a wound
infection. A culture grows methicillin-resistant
Staphylococcus aureus (MRSA). Which of the following
antibiotics would be useful in treating this infection?
A. Ceftriaxone
B. Dicloxacillin
C. Vancomycin
D. Nafcillin
Correct Answer: C. Vancomycin.
Rationale: Vancomycin is the drug of choice for MRSA
infections. Ceftriaxone, dicloxacillin, and nafcillin are beta-
lactams and are not effective against MRSA.
1
,3. Which of the following medications would be
preferred for control of ventricular response in
patients with atrial fibrillation and heart failure?
A. Diltiazem
B. Verapamil
C. Digoxin
D. Ibutilide
Correct Answer: C. Digoxin.
Rationale: Digoxin is preferred for rate control in atrial
fibrillation with heart failure because it increases contractility
(positive inotropic effect) while slowing the ventricular rate.
Diltiazem and verapamil are negative inotropes and can
worsen heart failure. Ibutilide is an antiarrhythmic for
conversion, not rate control.
4. A 78-year-old male is to have his teeth extracted.
He also has a history of mitral valve stenosis with
mild cardiac insufficiency. Which of the following
medications would be the most appropriate for
prophylaxis prior to his dental procedure?
A. Amoxicillin
B. Co-trimoxazole
C. Imipenem
D. Vancomycin
Correct Answer: A. Amoxicillin.
Rationale: Amoxicillin is the first-line antibiotic for infective
endocarditis prophylaxis before dental procedures. It
provides adequate coverage against oral streptococci. Co-
trimoxazole, imipenem, and vancomycin are not first-line for
this indication.
5. Methylphenidate is used in the treatment of:
A. Schizophrenia
B. Refractory depression
C. Attention deficit hyperactivity disorder (ADHD)
D. Autism
2
,Correct Answer: C. Attention deficit hyperactivity
disorder (ADHD).
Rationale: Methylphenidate is a CNS stimulant approved for
ADHD. It is not used for schizophrenia, refractory depression,
or autism.
6. In order to reduce the risk of thromboembolism, a
patient on oral contraceptive should be prescribed:
A. A combination product with a higher estrogen dose
B. A combination product with a higher progestin dose
C. A combination product with a lower estrogen dose
D. A combination product with a lower progestin dose
Correct Answer: C. A combination product with a
lower estrogen dose.
Rationale: The risk of thromboembolism with oral
contraceptives is primarily related to the estrogen dose.
Using a lower estrogen dose reduces this risk. Higher
estrogen doses increase the risk.
7. Bromocriptine has been recently approved for a
new indication:
A. Migraine
B. Diabetes type II
C. Heart failure
D. Anxiety
Correct Answer: B. Diabetes type II.
Rationale: Bromocriptine (Cycloset) was approved by the
FDA for the treatment of type 2 diabetes mellitus. It works by
improving insulin sensitivity and reducing glucose
production. It is also used for hyperprolactinemia and
Parkinson's disease.
8. A woman who has been taking an oral
contraceptive (estrogen plus progestin) for several
years is diagnosed with epilepsy and started
phenytoin. What is the most likely consequence of
adding phenytoin?
3
, A. Agranulocytosis or aplastic anemia, requiring stopping
both drugs immediately
B. Breakthrough seizures from increased phenytoin
clearance
C. Reduced contraceptive efficacy
D. Thromboembolism from the estrogen component of the
contraceptive
Correct Answer: C. Reduced contraceptive efficacy.
Rationale: Phenytoin is a potent enzyme inducer that
increases the metabolism of oral contraceptive steroids,
reducing their efficacy and increasing the risk of unintended
pregnancy. Women should be advised to use additional or
alternative contraception.
9. The mechanism of antibacterial action of
tetracycline involves:
A. Binding to a component of the 50S ribosomal subunit
B. Inhibition of translocase activity
C. Blockade of binding of aminoacyl-tRNA to bacterial
ribosomes
D. Selective inhibition of ribosomal peptidyl transferases
Correct Answer: C. Blockade of binding of aminoacyl-
tRNA to bacterial ribosomes.
Rationale: Tetracyclines bind to the 30S ribosomal subunit
and block the binding of aminoacyl-tRNA to the mRNA-
ribosome complex, inhibiting protein synthesis. They do not
bind to the 50S subunit or inhibit translocase or peptidyl
transferases.
10. A preferred therapeutic regimen in breast cancer
is:
A. Cyclophosphamide + doxorubicin followed by
paclitaxel
B. Cisplatin + etoposide
C. Melphalan + prednisone
D. Cyclophosphamide + dexamethasone + thalidomide
Correct Answer: A. Cyclophosphamide + doxorubicin
followed by paclitaxel.
Rationale: This is a standard adjuvant chemotherapy
regimen for breast cancer. The combination of
4
PHARMACY – SET 2 (QUESTIONS
1–100) – 2026 LATEST UPDATE –
VERIFIED ANSWERS WITH
RATIONALES – A+ GRADE
Subject: Pharmacology and Clinical Pharmacy
Direction: Choose the letter of the BEST answer. Each
question is worth 1 point.
1. Opioid receptors mostly involved in pain are:
A. Mu receptors
B. Kappa receptors
C. Y receptors
D. Omega-3 receptors
Correct Answer: A. Mu receptors.
Rationale: Mu (μ) receptors are the primary opioid
receptors involved in analgesia, respiratory depression,
euphoria, and physical dependence. Kappa receptors also
contribute to analgesia but are less involved in pain
modulation. Y and Omega-3 receptors are not opioid
receptors.
2. A 23-year-old woman who underwent an open
appendectomy is later found to have a wound
infection. A culture grows methicillin-resistant
Staphylococcus aureus (MRSA). Which of the following
antibiotics would be useful in treating this infection?
A. Ceftriaxone
B. Dicloxacillin
C. Vancomycin
D. Nafcillin
Correct Answer: C. Vancomycin.
Rationale: Vancomycin is the drug of choice for MRSA
infections. Ceftriaxone, dicloxacillin, and nafcillin are beta-
lactams and are not effective against MRSA.
1
,3. Which of the following medications would be
preferred for control of ventricular response in
patients with atrial fibrillation and heart failure?
A. Diltiazem
B. Verapamil
C. Digoxin
D. Ibutilide
Correct Answer: C. Digoxin.
Rationale: Digoxin is preferred for rate control in atrial
fibrillation with heart failure because it increases contractility
(positive inotropic effect) while slowing the ventricular rate.
Diltiazem and verapamil are negative inotropes and can
worsen heart failure. Ibutilide is an antiarrhythmic for
conversion, not rate control.
4. A 78-year-old male is to have his teeth extracted.
He also has a history of mitral valve stenosis with
mild cardiac insufficiency. Which of the following
medications would be the most appropriate for
prophylaxis prior to his dental procedure?
A. Amoxicillin
B. Co-trimoxazole
C. Imipenem
D. Vancomycin
Correct Answer: A. Amoxicillin.
Rationale: Amoxicillin is the first-line antibiotic for infective
endocarditis prophylaxis before dental procedures. It
provides adequate coverage against oral streptococci. Co-
trimoxazole, imipenem, and vancomycin are not first-line for
this indication.
5. Methylphenidate is used in the treatment of:
A. Schizophrenia
B. Refractory depression
C. Attention deficit hyperactivity disorder (ADHD)
D. Autism
2
,Correct Answer: C. Attention deficit hyperactivity
disorder (ADHD).
Rationale: Methylphenidate is a CNS stimulant approved for
ADHD. It is not used for schizophrenia, refractory depression,
or autism.
6. In order to reduce the risk of thromboembolism, a
patient on oral contraceptive should be prescribed:
A. A combination product with a higher estrogen dose
B. A combination product with a higher progestin dose
C. A combination product with a lower estrogen dose
D. A combination product with a lower progestin dose
Correct Answer: C. A combination product with a
lower estrogen dose.
Rationale: The risk of thromboembolism with oral
contraceptives is primarily related to the estrogen dose.
Using a lower estrogen dose reduces this risk. Higher
estrogen doses increase the risk.
7. Bromocriptine has been recently approved for a
new indication:
A. Migraine
B. Diabetes type II
C. Heart failure
D. Anxiety
Correct Answer: B. Diabetes type II.
Rationale: Bromocriptine (Cycloset) was approved by the
FDA for the treatment of type 2 diabetes mellitus. It works by
improving insulin sensitivity and reducing glucose
production. It is also used for hyperprolactinemia and
Parkinson's disease.
8. A woman who has been taking an oral
contraceptive (estrogen plus progestin) for several
years is diagnosed with epilepsy and started
phenytoin. What is the most likely consequence of
adding phenytoin?
3
, A. Agranulocytosis or aplastic anemia, requiring stopping
both drugs immediately
B. Breakthrough seizures from increased phenytoin
clearance
C. Reduced contraceptive efficacy
D. Thromboembolism from the estrogen component of the
contraceptive
Correct Answer: C. Reduced contraceptive efficacy.
Rationale: Phenytoin is a potent enzyme inducer that
increases the metabolism of oral contraceptive steroids,
reducing their efficacy and increasing the risk of unintended
pregnancy. Women should be advised to use additional or
alternative contraception.
9. The mechanism of antibacterial action of
tetracycline involves:
A. Binding to a component of the 50S ribosomal subunit
B. Inhibition of translocase activity
C. Blockade of binding of aminoacyl-tRNA to bacterial
ribosomes
D. Selective inhibition of ribosomal peptidyl transferases
Correct Answer: C. Blockade of binding of aminoacyl-
tRNA to bacterial ribosomes.
Rationale: Tetracyclines bind to the 30S ribosomal subunit
and block the binding of aminoacyl-tRNA to the mRNA-
ribosome complex, inhibiting protein synthesis. They do not
bind to the 50S subunit or inhibit translocase or peptidyl
transferases.
10. A preferred therapeutic regimen in breast cancer
is:
A. Cyclophosphamide + doxorubicin followed by
paclitaxel
B. Cisplatin + etoposide
C. Melphalan + prednisone
D. Cyclophosphamide + dexamethasone + thalidomide
Correct Answer: A. Cyclophosphamide + doxorubicin
followed by paclitaxel.
Rationale: This is a standard adjuvant chemotherapy
regimen for breast cancer. The combination of
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