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NR 566 Final Exam 2026 – Actual Exam Comprehensive
Questions, Frequently Tested Topics, Recently Tested Real
Questions with Verified 100% Correct Solutions
NR 566 Final Exam 2026: 100 Questions with Answers & Rationales
Section 1: Allergic Rhinitis and Antihistamines (Questions 1-10)
1. Which statement best explains why second-generation H₁ antihistamines (e.g., loratadine,
cetirizine, fexofenadine) are preferred for daytime allergic rhinitis?
A) They provide significantly stronger H₁ blockade than first-generation agents.
B) They cross the blood-brain barrier readily, improving CNS symptom control.
C) They have minimal sedation and anticholinergic effects compared with first-generation agents.
D) They have a shorter half-life, allowing more flexible dosing.
Answer: C) They have minimal sedation and anticholinergic effects compared with first-generation
agents.
Rationale: Second-generation H₁ antagonists have low penetration into the CNS, causing less
drowsiness and anticholinergic burden. This makes them safer for daytime use and in older adults.
2. Which adverse effect is the main reason first-generation H₁ antihistamines are avoided in most
older adults?
A) Risk of respiratory depression
B) Sedation with anticholinergic effects
C) Risk of hepatotoxicity
D) Increased risk of falls
Answer: B) Sedation with anticholinergic effects.
Rationale: First-generation antihistamines (e.g., diphenhydramine) are sedating and have significant
anticholinergic effects (dry mouth, urinary hesitancy, confusion). These properties are especially
harmful in older adults and are listed on the Beers criteria as potentially inappropriate medications.
3. What is the primary mechanism of action of intranasal glucocorticoids in treating allergic
rhinitis?
A) Immediate vasoconstriction of nasal blood vessels.
B) Mast cell stabilization preventing histamine release.
C) Genomic effects that suppress multiple inflammatory mediators in the nasal mucosa.
D) Blocking H1 receptors in the nasal passages.
Answer: C) Genomic effects that suppress multiple inflammatory mediators in the nasal mucosa.
Rationale: Intranasal glucocorticoids bind cytoplasmic receptors and alter gene transcription,
reducing the production of various inflammatory mediators (cytokines, chemokines). This prevents
and suppresses all major symptoms of allergic rhinitis.
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4. A patient is prescribed intranasal fluticasone for allergic rhinitis. What instruction is essential for
maximizing therapeutic benefit?
A) Use the spray only when symptoms are severe.
B) Use the spray daily; maximal effect may take up to a week.
C) Shake the bottle well before each use.
D) Tilt the head back and sniff deeply during administration.
Answer: B) Use the spray daily; maximal effect may take up to a week.
Rationale: Intranasal glucocorticoids require regular, daily use for optimal effectiveness. Their full
effect is not immediate and may develop over several days to a week. They should not be used on a
PRN basis for allergic rhinitis.
5. Rebound congestion (rhinitis medicamentosa) is most likely when which medication is used for
more than 3-5 days?
A) Oral loratadine
B) Intranasal fluticasone
C) Intranasal oxymetazoline
D) Oral montelukast
Answer: C) Intranasal oxymetazoline.
Rationale: Intranasal α₁-adrenergic decongestants like oxymetazoline can cause rebound congestion
if used longer than a few days. This leads to dependence and worsening of nasal congestion.
6. Which of the following is a common, but generally harmless, long-term effect of prostaglandin
analogs like latanoprost used for glaucoma?
A) Permanent clouding of the cornea
B) Heightened brown pigmentation of the iris
C) Progressive constriction of the visual field
D) Accelerated formation of cataracts
Answer: B) Heightened brown pigmentation of the iris.
Rationale: Prostaglandin analogs can cause increased brown pigmentation of the iris, periorbital
skin, and eyelashes. This cosmetic change is common but generally permanent and not dangerous.
Patients should be counseled on this before starting therapy.
7. Which glaucoma patient is the BEST candidate for betaxolol rather than timolol?
A) Patient with no comorbidities
B) Patient with mild renal impairment
C) Patient with asthma and open-angle glaucoma
D) Patient with narrow-angle glaucoma crisis
Answer: C) Patient with asthma and open-angle glaucoma.
Rationale: Betaxolol is a β₁-selective blocker. It is preferred in patients with reactive airway disease
because it has less risk of bronchospasm compared to nonselective β-blockers like timolol, which can
cause bronchoconstriction.
8. A patient on timolol ophthalmic drops reports shortness of breath and wheezing. What is the
most likely explanation?
A) Allergic reaction to the eye drops
B) Systemic absorption of timolol causing bronchospasm
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C) The patient has developed pneumonia
D) The eye drops are causing an anaphylactic reaction
Answer: B) Systemic absorption of timolol causing bronchospasm.
Rationale: Nonselective β-blockers like timolol can be systemically absorbed via the nasolacrimal
duct and cause bronchospasm in susceptible patients. Patients with a history of asthma or COPD
should be monitored for this adverse effect.
9. Why should patients be instructed to apply nasolacrimal occlusion (pressing on the inner corner
of the eye) after administering eye drops?
A) To prevent the medication from irritating the eye
B) To reduce systemic absorption of the medication
C) To increase the medication's duration of action
D) To prevent the medication from causing blurred vision
Answer: B) To reduce systemic absorption of the medication.
Rationale: Nasolacrimal occlusion reduces systemic absorption by preventing the medication from
draining through the tear duct into the nasal passages. This minimizes systemic side effects and can
also improve local efficacy.
10. A 5-year-old child with acute otitis externa and a perforated tympanic membrane needs
treatment. Which otic regimen is most appropriate?
A) Neomycin/polymyxin B/hydrocortisone drops
B) Ofloxacin 0.3% otic solution
C) Acetic acid 2% otic solution
D) Carbamide peroxide otic drops
Answer: B) Ofloxacin 0.3% otic solution.
Rationale: Fluoroquinolone otic solutions (ofloxacin, ciprofloxacin) are safe and recommended in the
presence of a tympanic membrane perforation. Aminoglycoside-containing drops (neomycin) should
be avoided due to the risk of ototoxicity if they enter the middle ear.
Section 2: Eye, Ear, Nose, and Skin Pharmacotherapy (Questions 11-20)
11. A patient with chronic eczema is using a high-potency topical corticosteroid on their forearms.
Which adverse effect is most important to discuss as a long-term risk?
A) Permanent depigmentation of the entire arm
B) Skin thinning and development of striae
C) Increased systemic blood pressure
D) Irreversible joint damage
Answer: B) Skin thinning and development of striae.
Rationale: Prolonged use of potent topical corticosteroids can suppress local immune responses and
collagen synthesis, leading to skin atrophy, thinning, and stretch marks (striae).
12. A 23-year-old woman is prescribed a topical retinoid for comedonal acne. What is the most
appropriate counseling point?
A) Apply it generously in the morning to freshly washed skin.
B) Expect no redness or peeling if used correctly.
NR 566 Final Exam 2026 – Actual Exam Comprehensive
Questions, Frequently Tested Topics, Recently Tested Real
Questions with Verified 100% Correct Solutions
NR 566 Final Exam 2026: 100 Questions with Answers & Rationales
Section 1: Allergic Rhinitis and Antihistamines (Questions 1-10)
1. Which statement best explains why second-generation H₁ antihistamines (e.g., loratadine,
cetirizine, fexofenadine) are preferred for daytime allergic rhinitis?
A) They provide significantly stronger H₁ blockade than first-generation agents.
B) They cross the blood-brain barrier readily, improving CNS symptom control.
C) They have minimal sedation and anticholinergic effects compared with first-generation agents.
D) They have a shorter half-life, allowing more flexible dosing.
Answer: C) They have minimal sedation and anticholinergic effects compared with first-generation
agents.
Rationale: Second-generation H₁ antagonists have low penetration into the CNS, causing less
drowsiness and anticholinergic burden. This makes them safer for daytime use and in older adults.
2. Which adverse effect is the main reason first-generation H₁ antihistamines are avoided in most
older adults?
A) Risk of respiratory depression
B) Sedation with anticholinergic effects
C) Risk of hepatotoxicity
D) Increased risk of falls
Answer: B) Sedation with anticholinergic effects.
Rationale: First-generation antihistamines (e.g., diphenhydramine) are sedating and have significant
anticholinergic effects (dry mouth, urinary hesitancy, confusion). These properties are especially
harmful in older adults and are listed on the Beers criteria as potentially inappropriate medications.
3. What is the primary mechanism of action of intranasal glucocorticoids in treating allergic
rhinitis?
A) Immediate vasoconstriction of nasal blood vessels.
B) Mast cell stabilization preventing histamine release.
C) Genomic effects that suppress multiple inflammatory mediators in the nasal mucosa.
D) Blocking H1 receptors in the nasal passages.
Answer: C) Genomic effects that suppress multiple inflammatory mediators in the nasal mucosa.
Rationale: Intranasal glucocorticoids bind cytoplasmic receptors and alter gene transcription,
reducing the production of various inflammatory mediators (cytokines, chemokines). This prevents
and suppresses all major symptoms of allergic rhinitis.
, 2
4. A patient is prescribed intranasal fluticasone for allergic rhinitis. What instruction is essential for
maximizing therapeutic benefit?
A) Use the spray only when symptoms are severe.
B) Use the spray daily; maximal effect may take up to a week.
C) Shake the bottle well before each use.
D) Tilt the head back and sniff deeply during administration.
Answer: B) Use the spray daily; maximal effect may take up to a week.
Rationale: Intranasal glucocorticoids require regular, daily use for optimal effectiveness. Their full
effect is not immediate and may develop over several days to a week. They should not be used on a
PRN basis for allergic rhinitis.
5. Rebound congestion (rhinitis medicamentosa) is most likely when which medication is used for
more than 3-5 days?
A) Oral loratadine
B) Intranasal fluticasone
C) Intranasal oxymetazoline
D) Oral montelukast
Answer: C) Intranasal oxymetazoline.
Rationale: Intranasal α₁-adrenergic decongestants like oxymetazoline can cause rebound congestion
if used longer than a few days. This leads to dependence and worsening of nasal congestion.
6. Which of the following is a common, but generally harmless, long-term effect of prostaglandin
analogs like latanoprost used for glaucoma?
A) Permanent clouding of the cornea
B) Heightened brown pigmentation of the iris
C) Progressive constriction of the visual field
D) Accelerated formation of cataracts
Answer: B) Heightened brown pigmentation of the iris.
Rationale: Prostaglandin analogs can cause increased brown pigmentation of the iris, periorbital
skin, and eyelashes. This cosmetic change is common but generally permanent and not dangerous.
Patients should be counseled on this before starting therapy.
7. Which glaucoma patient is the BEST candidate for betaxolol rather than timolol?
A) Patient with no comorbidities
B) Patient with mild renal impairment
C) Patient with asthma and open-angle glaucoma
D) Patient with narrow-angle glaucoma crisis
Answer: C) Patient with asthma and open-angle glaucoma.
Rationale: Betaxolol is a β₁-selective blocker. It is preferred in patients with reactive airway disease
because it has less risk of bronchospasm compared to nonselective β-blockers like timolol, which can
cause bronchoconstriction.
8. A patient on timolol ophthalmic drops reports shortness of breath and wheezing. What is the
most likely explanation?
A) Allergic reaction to the eye drops
B) Systemic absorption of timolol causing bronchospasm
, 3
C) The patient has developed pneumonia
D) The eye drops are causing an anaphylactic reaction
Answer: B) Systemic absorption of timolol causing bronchospasm.
Rationale: Nonselective β-blockers like timolol can be systemically absorbed via the nasolacrimal
duct and cause bronchospasm in susceptible patients. Patients with a history of asthma or COPD
should be monitored for this adverse effect.
9. Why should patients be instructed to apply nasolacrimal occlusion (pressing on the inner corner
of the eye) after administering eye drops?
A) To prevent the medication from irritating the eye
B) To reduce systemic absorption of the medication
C) To increase the medication's duration of action
D) To prevent the medication from causing blurred vision
Answer: B) To reduce systemic absorption of the medication.
Rationale: Nasolacrimal occlusion reduces systemic absorption by preventing the medication from
draining through the tear duct into the nasal passages. This minimizes systemic side effects and can
also improve local efficacy.
10. A 5-year-old child with acute otitis externa and a perforated tympanic membrane needs
treatment. Which otic regimen is most appropriate?
A) Neomycin/polymyxin B/hydrocortisone drops
B) Ofloxacin 0.3% otic solution
C) Acetic acid 2% otic solution
D) Carbamide peroxide otic drops
Answer: B) Ofloxacin 0.3% otic solution.
Rationale: Fluoroquinolone otic solutions (ofloxacin, ciprofloxacin) are safe and recommended in the
presence of a tympanic membrane perforation. Aminoglycoside-containing drops (neomycin) should
be avoided due to the risk of ototoxicity if they enter the middle ear.
Section 2: Eye, Ear, Nose, and Skin Pharmacotherapy (Questions 11-20)
11. A patient with chronic eczema is using a high-potency topical corticosteroid on their forearms.
Which adverse effect is most important to discuss as a long-term risk?
A) Permanent depigmentation of the entire arm
B) Skin thinning and development of striae
C) Increased systemic blood pressure
D) Irreversible joint damage
Answer: B) Skin thinning and development of striae.
Rationale: Prolonged use of potent topical corticosteroids can suppress local immune responses and
collagen synthesis, leading to skin atrophy, thinning, and stretch marks (striae).
12. A 23-year-old woman is prescribed a topical retinoid for comedonal acne. What is the most
appropriate counseling point?
A) Apply it generously in the morning to freshly washed skin.
B) Expect no redness or peeling if used correctly.
