Pharmacology Quiz: Contraindications And Risk Benefit

20 questions · exam conditions

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Contraindications And Risk BenefitQuestion 1 of 20

A 32-year-old G2P1 woman at 30 weeks gestation presents in preterm labor. Her medical history is significant for poorly controlled type 1 diabetes mellitus with recent episodes of hyperglycemia. The obstetrician is deciding on a tocolytic agent to suppress contractions. Which of the following agents is relatively contraindicated due to this patient's specific comorbidity?

Nifedipine

Indomethacin

Terbutaline

Magnesium sulfate

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Pharmacology Quiz

Pharmacology Quiz: Contraindications And Risk Benefit

Practice Contraindications And Risk Benefit in Pharmacology with focused quiz questions that help you check what you know, review explanations, and build confidence with test-style prompts.

What this quiz covers

This quiz focuses on Contraindications And Risk Benefit, giving you a quick way to practice the rules, question types, and explanations that matter most for Pharmacology.

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Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

All questions

Question 1

Nifedipine
Indomethacin
Terbutaline (correct answer)
Magnesium sulfate

Explanation: Terbutaline is a beta-2 adrenergic agonist. Stimulation of beta-2 receptors leads to glycogenolysis and gluconeogenesis in the liver and decreased glucose uptake by peripheral tissues, all of which result in hyperglycemia. In a patient with poorly controlled type 1 diabetes, this effect can be profound, potentially worsening her hyperglycemia and even precipitating diabetic ketoacidosis (DKA). Therefore, beta-2 agonists are relatively contraindicated as tocolytics in patients with diabetes. Other agents like nifedipine or magnesium sulfate do not have this direct hyperglycemic effect.

Question 2

A 68-year-old male with type 2 diabetes, managed with metformin, is scheduled for a cardiac catheterization with iodinated contrast media. His most recent estimated glomerular filtration rate (eGFR) is 45 mL/min/1.73m². Which course of action represents the best risk-benefit decision regarding his metformin therapy?

Continue metformin without change to prevent hyperglycemia-induced osmotic diuresis and dehydration.
Withhold metformin before the procedure and for 48 hours after, re-evaluating renal function before restarting. (correct answer)
Permanently discontinue metformin and initiate insulin therapy due to the risk of contrast-induced nephropathy.
Reduce the metformin dose by 50% for one week following the procedure to minimize systemic exposure.

Explanation: The administration of iodinated contrast media can cause a temporary decline in renal function. In patients taking metformin with a pre-existing eGFR between 30-60 mL/min/1.73m², this creates a risk of metformin accumulation and subsequent lactic acidosis, a rare but life-threatening condition. Standard guidelines recommend withholding metformin at the time of or prior to the procedure, withholding it for 48 hours after, and restarting only after renal function has been re-evaluated and is not acutely worsened.

Question 3

A 55-year-old female requests treatment for toenail onychomycosis. Her medical history is significant for chronic hepatitis C infection with evidence of moderate hepatic fibrosis, though her recent liver function tests are within normal limits. Her provider is considering a 12-week course of oral terbinafine. What is the most important risk-benefit consideration?

Terbinafine is contraindicated in patients with chronic or active liver disease due to the risk of precipitating severe hepatotoxicity. (correct answer)
The benefit of treating a primarily cosmetic nail infection outweighs the minimal and reversible risk of liver enzyme elevation.
Terbinafine requires a 50% dose reduction in patients with hepatic impairment but can otherwise be used safely with monitoring.
The primary risk is a drug-drug interaction between terbinafine and any potential hepatitis C antiviral medications she might take.

Explanation: Oral terbinafine carries a warning for rare but serious cases of hepatotoxicity, including liver failure and death. Because of this, it is contraindicated by the manufacturer for patients with pre-existing chronic or active liver disease. While the patient's LFTs may be normal at baseline, the underlying fibrotic liver has reduced functional reserve, placing her at higher risk. The risk-benefit analysis does not favor using a potentially hepatotoxic drug for a non-life-threatening condition like onychomycosis in such a patient.

Question 4

A 48-year-old patient being treated for refractory depression with phenelzine reports significant mood improvement. During a follow-up visit, he mentions he is looking forward to a celebration dinner at a restaurant known for its aged cheeses, cured sausages, and red wine. Which of the following is the most critical contraindication to discuss with this patient?

The high sodium content of these foods is contraindicated as it may lead to fluid overload and edema.
These foods must be avoided as they contain high levels of tyramine, which can precipitate a hypertensive crisis. (correct answer)
His phenelzine dose must be taken at least two hours after the meal to prevent chelation and reduced absorption.
The combination may lead to serotonin syndrome if the foods also contain high levels of the amino acid tryptophan.

Explanation: Phenelzine is an irreversible monoamine oxidase inhibitor (MAOI). MAO-A in the gut wall and liver is responsible for breaking down dietary pressor amines like tyramine. When this enzyme is inhibited, ingested tyramine is absorbed systemically, causing a massive release of norepinephrine from sympathetic nerve terminals. This can lead to a sudden, severe, and potentially fatal hypertensive crisis. Aged cheeses, cured meats, and certain alcoholic beverages are rich in tyramine and are strictly contraindicated for patients on MAOI therapy.

Question 5

An 8-year-old boy presents with a complicated urinary tract infection and pyelonephritis caused by a multidrug-resistant Pseudomonas aeruginosa. The only effective oral antibiotic identified by susceptibility testing is ciprofloxacin. What is the most accurate risk-benefit assessment for using ciprofloxacin in this child?

Fluoroquinolones are absolutely contraindicated in all patients under 18 years due to concerns of irreversible arthropathy.
Ciprofloxacin is contraindicated because of the risk of Reye's syndrome in children with potential concurrent viral illnesses.
The primary contraindication is permanent tooth discoloration, which is a certainty if used before the age of 12.
Use is justified as the benefit of treating a serious infection outweighs the potential, but typically reversible, risk of arthropathy. (correct answer)

Explanation: When you encounter pediatric antibiotic questions, you need to weigh the severity of infection against age-specific drug risks. This scenario presents a serious, life-threatening infection with limited treatment options, making risk-benefit analysis crucial. Ciprofloxacin use in this case is justified because the child has a severe, multidrug-resistant infection where ciprofloxacin is the only effective oral option. While fluoroquinolones do carry arthropathy risks in children, these effects are typically reversible, and the benefit of treating a potentially fatal pyelonephritis outweighs this risk. The FDA allows fluoroquinolone use in children when benefits exceed risks. Let's examine why the other options are incorrect. Choice A is too absolute—fluoroquinolones aren't completely contraindicated in children under 18. They're discouraged as first-line agents, but can be used when necessary, and arthropathy is usually reversible, not irreversible. Choice B confuses ciprofloxacin with aspirin. Reye's syndrome is associated with salicylate use during viral illnesses, not fluoroquinolones. Choice C incorrectly attributes tooth discoloration to ciprofloxacin—this is actually a side effect of tetracyclines, not fluoroquinolones. Remember this key principle: pediatric antibiotic contraindications are rarely absolute. When you see "multidrug-resistant" infections with limited treatment options, the severity of untreated infection usually outweighs potential drug risks. Focus on matching the correct side effect profile to each antibiotic class—fluoroquinolones cause arthropathy, tetracyclines cause tooth discoloration, and salicylates (not fluoroquinolones) are linked to Reye's syndrome.

Question 6

A 58-year-old male with newly diagnosed essential hypertension also has a history of gout, with his last flare being over a year ago. His baseline serum uric acid is 7.5 mg/dL. The provider suggests starting hydrochlorothiazide. Which statement is most accurate regarding this choice?

This diuretic is relatively contraindicated as it can decrease the renal excretion of uric acid and precipitate a gout attack. (correct answer)
This medication is an excellent first-line choice; the risk of a gout flare is not significantly increased compared to other agents.
This drug is absolutely contraindicated in any patient with a history of gout, regardless of flare frequency or uric acid level.
The primary contraindication is the risk of hypokalemia, which can lead to crystal deposition in the joints.

Explanation: Thiazide diuretics like hydrochlorothiazide are known to cause hyperuricemia. They compete with uric acid for secretion at the organic acid transporter in the proximal tubule of the kidney, leading to decreased uric acid excretion. In a patient with a history of gout and pre-existing borderline-high uric acid levels, initiating a thiazide diuretic poses a significant risk of precipitating an acute gouty flare. This makes it a relative contraindication, and other antihypertensive classes (e.g., ARBs like losartan, which is uricosuric, or calcium channel blockers) are often preferred.

Question 7

Nifedipine
Indomethacin
Terbutaline (correct answer)
Magnesium sulfate

Question 8

A 19-year-old female with severe, refractory nodulocystic acne is a candidate for oral isotretinoin. Which of the following is an absolute requirement based on the primary contraindication for this drug in this patient?

A baseline liver function test and lipid panel, as hepatotoxicity is the most severe adverse effect.
Enrollment in the iPLEDGE risk management program due to the extreme risk of severe birth defects. (correct answer)
A signed waiver acknowledging the risk of inflammatory bowel disease, which is a known complication.
Concomitant use of a tetracycline antibiotic to prevent gram-negative folliculitis during therapy.

Explanation: Isotretinoin is one of the most potent human teratogens in clinical use, causing severe, life-threatening birth defects. This risk is the primary contraindication in females of childbearing potential. To mitigate this risk, the FDA mandates the iPLEDGE program. This strict risk management program requires documentation of two forms of effective contraception, two negative pregnancy tests before starting, and monthly negative pregnancy tests before each new prescription can be dispensed. While other side effects like hepatotoxicity exist, the teratogenic risk is the reason for these unparalleled restrictions.

Question 9

A 75-year-old male with stable NYHA Class III heart failure (ejection fraction 30%) develops acute osteoarthritis pain in his knee. His creatinine is 1.5 mg/dL. His provider considers prescribing a short course of naproxen. What is the primary pathophysiologic reason this class of medication is relatively contraindicated?

Direct negative inotropic effects on the myocardium, which acutely worsens the patient's systolic function.
Inhibition of renal prostaglandin synthesis, leading to sodium and water retention and potential cardiac decompensation. (correct answer)
A high risk of gastrointestinal bleeding, which is poorly tolerated due to concomitant antiplatelet therapy in heart failure.
Competitive antagonism at beta-adrenergic receptors, counteracting the effects of his carvedilol therapy.

Explanation: In heart failure, renal perfusion is maintained in part by vasodilatory prostaglandins. Non-steroidal anti-inflammatory drugs (NSAIDs) like naproxen inhibit cyclooxygenase (COX) enzymes, thereby decreasing prostaglandin synthesis. This leads to afferent arteriolar vasoconstriction in the kidney, reduced renal blood flow, and increased sodium and water retention. The resulting volume expansion can increase preload and afterload, precipitating an acute exacerbation of heart failure. This hemodynamic effect is the primary contraindication in this patient population.

Question 10

A 66-year-old male with stable angina pectoris, treated with isosorbide mononitrate, asks his physician for a prescription for sildenafil for erectile dysfunction. What is the absolute contraindication to using these medications concurrently?

Increased risk of myocardial infarction due to sildenafil-induced coronary steal syndrome.
Competitive inhibition of the CYP3A4 enzyme system, leading to dangerously high levels of the nitrate.
Synergistic potentiation of vasodilation via the nitric oxide-cGMP pathway, leading to severe hypotension. (correct answer)
An additive risk of significant QT interval prolongation, predisposing the patient to ventricular arrhythmias.

Explanation: Organic nitrates (like isosorbide mononitrate) work by increasing the production of cyclic guanosine monophosphate (cGMP), which causes vasodilation. Sildenafil is a phosphodiesterase-5 (PDE5) inhibitor, which works by preventing the breakdown of cGMP. When used together, the accumulation of cGMP is profound and synergistic, leading to widespread, severe vasodilation and a precipitous drop in blood pressure. This can cause syncope, ischemia, and even death, and is an absolute contraindication.

Question 11

A 29-year-old woman at 14 weeks gestation presents for a routine prenatal visit. Her blood pressure is 155/95 mmHg. Her medical history is significant for essential hypertension, for which she has been taking lisinopril 10 mg daily. Which of the following is the most critical reason to discontinue lisinopril in this patient?

The risk of maternal hyperkalemia, which is potentiated by pregnancy-related renal changes.
The development of a persistent, nonproductive cough that can interfere with sleep and well-being.
The established risk of major congenital malformations and fetal renal agenesis when used in the second and third trimesters. (correct answer)
The potential for inadequate blood pressure control as plasma volume expands throughout gestation.

Explanation: ACE inhibitors like lisinopril are contraindicated in pregnancy, particularly during the second and third trimesters, due to their established teratogenicity. They carry a boxed warning for fetal toxicity, including renal dysfunction, oligohydramnios, and skull hypoplasia. This risk to the fetus is the most critical and absolute reason for discontinuation.

Question 12

A 72-year-old male on long-term warfarin therapy for atrial fibrillation has maintained a stable INR of 2.5. He develops community-acquired pneumonia and is prescribed a 7-day course of trimethoprim-sulfamethoxazole (TMP-SMX). What is the primary safety concern that necessitates immediate intervention?

Decreased warfarin efficacy due to antibiotic-induced enhancement of vitamin K-producing gut flora.
A synergistic effect on QT interval prolongation, increasing the risk for torsades de pointes.
A significant increase in INR and risk of major bleeding due to potent CYP2C9 inhibition by the antibiotic. (correct answer)
Reduced absorption of warfarin from the gastrointestinal tract caused by the TMP-SMX formulation.

Explanation: Trimethoprim-sulfamethoxazole is a potent inhibitor of the cytochrome P450 enzyme CYP2C9, which is the primary enzyme responsible for metabolizing the more potent S-enantiomer of warfarin. Inhibition of this enzyme leads to decreased warfarin clearance, a subsequent sharp increase in INR, and a significantly elevated risk of life-threatening bleeding. This interaction is a classic, high-risk contraindication requiring immediate management, such as selecting an alternative antibiotic or making aggressive adjustments to the warfarin dose with close INR monitoring.

Question 13

A 22-year-old female is diagnosed with bipolar I disorder and also has a history of generalized tonic-clonic seizures. Her physician suggests initiating divalproex sodium. Which factor presents the most compelling reason to consider alternative agents before starting this medication?

The high risk of life-threatening pancreatitis, which is more common in this age group.
The significant potential for weight gain and development of polycystic ovary syndrome.
The high teratogenic potential, including a significant risk of neural tube defects if pregnancy occurs. (correct answer)
The likelihood of drug interactions that would decrease the efficacy of hormonal contraceptives.

Explanation: Valproic acid and its derivatives (divalproex sodium) are potent human teratogens, associated with a 10% risk of major congenital malformations, including a 1-2% risk of neural tube defects. For a female of childbearing potential, this risk is a primary consideration and often a relative contraindication, especially when other effective medications with lower teratogenic risk (e.g., lamotrigine, certain atypical antipsychotics) are available. While other risks like pancreatitis and weight gain exist, the teratogenic risk is paramount in this patient population.

Question 14

Direct negative inotropic effects on the myocardium, which acutely worsens the patient's systolic function.
Inhibition of renal prostaglandin synthesis, leading to sodium and water retention and potential cardiac decompensation. (correct answer)
A high risk of gastrointestinal bleeding, which is poorly tolerated due to concomitant antiplatelet therapy in heart failure.
Competitive antagonism at beta-adrenergic receptors, counteracting the effects of his carvedilol therapy.

Question 15

A newly diagnosed 41-year-old patient with HIV is being evaluated for an initial antiretroviral therapy (ART) regimen that includes abacavir. Which of the following evaluations is mandatory before prescribing this agent to assess for a contraindication?

A G6PD deficiency screen to prevent drug-induced hemolytic anemia.
HLA-B*5701 allele testing to prevent a potentially fatal hypersensitivity reaction. (correct answer)
A CYP2C19 genotype panel to determine the appropriate starting dose.
A baseline bone mineral density scan due to the high risk of osteoporosis.

Explanation: Abacavir is associated with a multi-organ, potentially fatal hypersensitivity reaction (HSR) in about 5-8% of patients. This reaction is strongly linked to the presence of the human leukocyte antigen (HLA)-B*5701 allele. Screening for this allele before initiating abacavir is now the standard of care. If the test is positive, abacavir is permanently contraindicated for that patient. This pharmacogenomic testing has dramatically reduced the incidence of abacavir HSR.

Question 16

Fluoroquinolones are absolutely contraindicated in all patients under 18 years due to concerns of irreversible arthropathy.
Ciprofloxacin is contraindicated because of the risk of Reye's syndrome in children with potential concurrent viral illnesses.
The primary contraindication is permanent tooth discoloration, which is a certainty if used before the age of 12.
Use is justified as the benefit of treating a serious infection outweighs the potential, but typically reversible, risk of arthropathy. (correct answer)

Question 17

An 80-year-old female with recurrent, symptomatic atrial fibrillation is being considered for long-term amiodarone therapy. She has a history of moderate COPD and a thyroid nodule of unknown significance. Which pre-existing conditions represent the most significant potential contraindications that must be thoroughly evaluated before initiation?

History of lens opacities and mild chronic kidney disease.
Peripheral neuropathy and chronic constipation.
Concurrent therapy with atorvastatin and metoprolol.
Pre-existing severe pulmonary disease and current thyroid dysfunction. (correct answer)

Explanation: When evaluating any patient for amiodarone therapy, you must carefully assess for conditions that could be severely exacerbated by this drug's unique toxicity profile. Amiodarone has two major organ systems where serious, potentially life-threatening complications occur: the lungs and thyroid gland. Amiodarone causes pulmonary toxicity in 5-15% of patients, presenting as pneumonitis or fibrosis that can be fatal. In patients with pre-existing severe pulmonary disease like advanced COPD, the respiratory reserve is already compromised, making any additional lung injury potentially catastrophic. Additionally, amiodarone contains iodine and affects thyroid function in multiple ways, causing both hyperthyroidism and hypothyroidism. In a patient with an existing thyroid nodule of unknown significance, amiodarone could trigger dangerous thyrotoxicosis or mask underlying thyroid pathology. Choice A describes relatively minor concerns - lens deposits occur in most patients but rarely affect vision, and mild kidney disease doesn't significantly alter amiodarone metabolism. Choice B lists side effects that, while bothersome, aren't life-threatening contraindications. Choice C mentions drug interactions, but neither atorvastatin nor metoprolol represents a major contraindication to amiodarone use. For pharmacology exams, remember that amiodarone questions often test knowledge of its "big three" toxicities: pulmonary, thyroid, and hepatic. Always look for answer choices that highlight pre-existing lung or thyroid disease, as these represent the most serious relative contraindications requiring extensive pre-treatment evaluation and ongoing monitoring.

Question 18

This diuretic is relatively contraindicated as it can decrease the renal excretion of uric acid and precipitate a gout attack. (correct answer)
This medication is an excellent first-line choice; the risk of a gout flare is not significantly increased compared to other agents.
This drug is absolutely contraindicated in any patient with a history of gout, regardless of flare frequency or uric acid level.
The primary contraindication is the risk of hypokalemia, which can lead to crystal deposition in the joints.

Question 19

A 70-year-old male with HFrEF is managed with lisinopril and carvedilol. His eGFR is 28 mL/min/1.73m² and his baseline serum potassium is 5.1 mEq/L. A cardiologist suggests adding spironolactone 12.5 mg daily. Which factor is the strongest contraindication to this therapeutic addition?

The high incidence of painful gynecomastia, which would likely lead to non-adherence in this patient.
The additive diuretic effect, which would likely cause severe volume depletion and orthostatic hypotension.
The significant cumulative risk of life-threatening hyperkalemia from multiple concurrent risk factors. (correct answer)
The drug's primary reliance on renal clearance, which is severely limited by the patient's low eGFR.

Explanation: The use of spironolactone is contraindicated in this patient due to the high risk of severe hyperkalemia. He has three major risk factors: 1) advanced chronic kidney disease (eGFR < 30), which impairs potassium excretion; 2) concurrent use of an ACE inhibitor (lisinopril), which also increases potassium; and 3) a baseline potassium at the upper limit of normal. Adding a mineralocorticoid receptor antagonist (spironolactone), which blocks aldosterone's effect of potassium excretion, would very likely lead to dangerous or fatal hyperkalemia. Clinical trials establishing the benefit of spironolactone in heart failure generally excluded patients with this degree of renal impairment or hyperkalemia.

Question 20

A 34-year-old female with major depressive disorder, stable on escitalopram 20 mg daily, presents with frequent debilitating migraines. A provider suggests initiating sumatriptan for abortive therapy. Which statement best characterizes the risk-benefit assessment for this combination?

Concurrent use is absolutely contraindicated due to the near certainty of life-threatening serotonin syndrome.
The combination can be used cautiously with patient education on the signs of serotonin syndrome, as the absolute risk is low. (correct answer)
Sumatriptan's efficacy will be blunted because escitalopram downregulates the 5-HT1B/1D receptors that sumatriptan targets.
The escitalopram dose must be temporarily discontinued for 24 hours each time sumatriptan is taken to mitigate risk.

Explanation: Both SSRIs (escitalopram) and triptans (sumatriptan) are serotonergic agents. The FDA has issued a warning about a potential increased risk of serotonin syndrome with concomitant use. However, large observational studies suggest the absolute risk is very low. In clinical practice, the combination is frequently used because the benefit of treating debilitating migraines often outweighs this small risk. The appropriate management is not to declare it an absolute contraindication, but to proceed with caution and educate the patient to recognize and report symptoms of serotonin syndrome (e.g., agitation, confusion, tachycardia, tremor, hyperthermia).