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CMCC External Pharmacist Exam study materials
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CMCC External Pharmacist Exam practice questions

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Question 1General Pharmacy Practice and Dispensing

A prescription for a controlled substance is presented at the pharmacy counter. Which element must the pharmacist verify is present on the prescription for it to be legally dispensed?

  1. The patient's insurance policy number
  2. The prescriber's handwritten signature and DEA number Correct answer.
  3. The pharmacy's internal prescription tracking code
  4. The manufacturer's lot number of the drug

Explanation

A valid controlled substance prescription must include the prescriber's signature and DEA registration number, along with patient and drug details. Insurance numbers, internal tracking codes, and manufacturer lot numbers are not legal requirements on the prescription itself.

Question 2General Pharmacy Practice and Dispensing

A patient asks how to store a bottle of insulin that is currently in use. What is the most appropriate instruction?

  1. Keep it in the freezer until the vial is empty
  2. Keep it at room temperature, away from heat and light, for the in-use period Correct answer.
  3. Store it in direct sunlight to keep it warm
  4. Store it in the refrigerator at all times, even after opening

Explanation

In-use insulin vials are generally kept at room temperature away from heat and direct light for the labeled in-use period, which is typically about 28 days. Freezing destroys the protein structure, and refrigeration is reserved for unopened stock. Direct sunlight degrades insulin.

Question 3General Pharmacy Practice and Dispensing

Which auxiliary label is most appropriate to apply to a bottle of oral suspension containing amoxicillin?

  1. "Do not take with dairy products"
  2. "May cause drowsiness"
  3. "Shake well before use" Correct answer.
  4. "For external use only"

Explanation

Oral suspensions settle during storage, so the patient must shake the bottle to redistribute the drug evenly before each dose. Drowsiness, dairy interactions, and external-use warnings do not apply to amoxicillin suspension.

Question 4General Pharmacy Practice and Dispensing

A prescription reads "Sig: 1 tab po bid x 10 days." How many tablets should be dispensed?

  1. 20 tablets Correct answer.
  2. 10 tablets
  3. 40 tablets
  4. 30 tablets

Explanation

"Bid" means twice daily, so the patient takes 2 tablets per day for 10 days, totaling 20 tablets. Multiplying the daily frequency by the duration gives the correct quantity to dispense.

Question 5General Pharmacy Practice and Dispensing

Which piece of information is essential to record in the patient medication profile when dispensing a new prescription?

  1. The patient's known drug allergies Correct answer.
  2. The patient's favorite television program
  3. The patient's preferred pharmacy brand of coffee
  4. The patient's shoe size

Explanation

Documenting known drug allergies is a core safety requirement because it allows the pharmacist to screen for potential allergic reactions before dispensing. The other items are irrelevant to medication safety and are not part of a medication profile.

Question 6General Pharmacy Practice and Dispensing

A prescriber writes an order using the abbreviation "q.d." What is the recommended practice for the pharmacist?

  1. Dispense as written because the abbreviation is standard
  2. Interpret it as four times daily and dispense accordingly
  3. Ignore the abbreviation and dispense one tablet weekly
  4. Clarify with the prescriber because the abbreviation is on the error-prone list Correct answer.

Explanation

"Q.d." is on the ISMP list of error-prone abbreviations because it can be misread as "q.i.d." or "q.o.d." The pharmacist should clarify the intended frequency with the prescriber and document the clarification.

Question 7General Pharmacy Practice and Dispensing

Which reference source is most appropriate for quickly checking whether two drugs have a clinically significant interaction?

  1. A drug interaction database or tertiary references such as Micromedex Correct answer.
  2. A package insert for a single unrelated drug
  3. A general chemistry textbook
  4. A hospital's employee handbook

Explanation

Drug interaction databases and tertiary references compile evaluated interaction data and provide severity ratings and management recommendations. A single package insert, a chemistry text, or an employee handbook would not provide comprehensive interaction information.

Question 8General Pharmacy Practice and Dispensing

A patient presents a prescription for a Schedule II opioid. Which action is required before dispensing?

  1. Dispense without any prescriber verification
  2. Verify the prescription meets legal requirements and confirm the prescriber's DEA registration Correct answer.
  3. Dispense refills for up to six months
  4. Substitute a non-controlled drug without contacting the prescriber

Explanation

Schedule II prescriptions require verification of legal elements, including the prescriber's valid DEA registration, before dispensing. Schedule II drugs cannot be refilled, and substitution requires prescriber authorization where permitted.

Question 9General Pharmacy Practice and Dispensing

A prescription is written for a drug with a narrow therapeutic index. Which practice best supports safe dispensing?

  1. Dispense the drug without checking the dose
  2. Verify the dose against the patient's renal function, age, and weight, and confirm with the prescriber if needed Correct answer.
  3. Assume the prescriber has already checked all factors
  4. Round the dose up to the nearest whole tablet without analysis

Explanation

Narrow therapeutic index drugs require careful dose verification against patient-specific factors such as renal function, age, and weight. Confirming with the prescriber when the dose appears inconsistent prevents toxicity or treatment failure.

Question 10General Pharmacy Practice and Dispensing

A patient reports taking warfarin and asks about adding an over-the-counter NSAID for headache. What is the pharmacist's best response?

  1. Advise against the NSAID because of increased bleeding risk and suggest acetaminophen after checking the patient's regimen Correct answer.
  2. Tell the patient that OTC drugs never interact with prescription drugs
  3. Recommend the NSAID because it is available without a prescription
  4. Recommend doubling the warfarin dose to offset the interaction

Explanation

NSAIDs increase bleeding risk when combined with warfarin through antiplatelet effects and gastrointestinal irritation. Acetaminophen is generally a safer analgesic choice after confirming the patient's total daily dose and liver status.

Question 11General Pharmacy Practice and Dispensing

A prescription for a pediatric patient is written for 15 mg/kg/day divided every 8 hours. The child weighs 22 kg. What is the amount per dose?

  1. 165 mg
  2. 110 mg Correct answer.
  3. 55 mg
  4. 330 mg

Explanation

The total daily dose is 15 mg/kg × 22 kg = 330 mg/day. Dividing by three doses per day gives 110 mg per dose.

Question 12General Pharmacy Practice and Dispensing

A pharmacist receives a prescription for a drug that is not stocked but has an equivalent therapeutic alternative available. What is the appropriate action?

  1. Tell the patient to return without offering any options
  2. Contact the prescriber to obtain authorization for the substitution Correct answer.
  3. Dispense a partial quantity of the original drug and bill the full amount
  4. Dispense the alternative without contacting the prescriber

Explanation

Therapeutic substitution requires prescriber authorization unless a state-specific substitution law permits it. Contacting the prescriber ensures the change is clinically appropriate and legally documented.

Question 13General Pharmacy Practice and Dispensing

Which action best reduces the risk of a dispensing error when two look-alike/sound-alike drugs are stored near each other?

  1. Rely on memory alone to distinguish them
  2. Use tall-man lettering and separate storage locations Correct answer.
  3. Remove all labels from the stock bottles
  4. Store them next to each other for convenience

Explanation

Tall-man lettering and physical separation reduce selection errors between look-alike/sound-alike products. Removing labels or relying on memory increases the risk of choosing the wrong product.

Question 14General Pharmacy Practice and Dispensing

A patient with a documented penicillin allergy is prescribed a cephalosporin. What is the pharmacist's most appropriate first step?

  1. Substitute an unrelated antibiotic without contacting the prescriber
  2. Assess the nature and severity of the penicillin reaction and consult the prescriber about cross-reactivity risk Correct answer.
  3. Dispense immediately because cross-reactivity is impossible
  4. Refuse to dispense and end the conversation

Explanation

Cross-reactivity between penicillins and cephalosporins depends on the specific reaction history and the cephalosporin's side chain. Assessing the reaction and consulting the prescriber allows a safe decision.

Question 15General Pharmacy Practice and Dispensing

Which counseling point is most important for a patient starting metronidazole?

  1. Expect the drug to cause hearing loss
  2. Take the drug with large amounts of dairy products
  3. Stop the drug if any improvement occurs
  4. Avoid alcohol during therapy and for several days afterward Correct answer.

Explanation

Metronidazole can produce a disulfiram-like reaction with alcohol, causing flushing, nausea, and vomiting. Patients should avoid alcohol during treatment and for several days after completion.

Question 16General Pharmacy Practice and Dispensing

A prescription is received for a medication that requires prior authorization. What is the most appropriate pharmacy action?

  1. Inform the patient of the prior authorization requirement and assist with the process or contact the prescriber Correct answer.
  2. Discard the prescription
  3. Dispense the medication and bill the patient the full cash price without discussion
  4. Dispense a different medication without authorization

Explanation

When prior authorization is required, the pharmacy should inform the patient and help facilitate the process, often by contacting the prescriber. This supports timely access while respecting payer requirements.

Question 17General Pharmacy Practice and Dispensing

A patient on digoxin reports nausea, visual changes, and a pulse of 48 beats per minute. What should the pharmacist do?

  1. Advise the patient to seek immediate medical evaluation for possible digoxin toxicity Correct answer.
  2. Recommend increasing the digoxin dose
  3. Reassure the patient that these are expected effects
  4. Recommend taking the next dose early

Explanation

Nausea, visual disturbances, and bradycardia are classic signs of digoxin toxicity. The patient needs prompt medical evaluation, including a digoxin level and electrolyte assessment.

Question 18General Pharmacy Practice and Dispensing

Which of the following is the correct way to interpret a prescription sig of "1 gtt ou qid"?

  1. One drop in both eyes four times daily Correct answer.
  2. One drop in the right eye once daily
  3. One gram in each ear four times daily
  4. One gram by mouth four times daily

Explanation

"Gtt" means drops, "ou" means both eyes, and "qid" means four times daily. Together the sig directs one drop in each eye four times daily.

Question 19General Pharmacy Practice and Dispensing

A patient asks whether a generic equivalent can be substituted for a brand-name prescription. Which statement is most accurate?

  1. Generic substitution requires no consideration of state law
  2. Generic products are always therapeutically inferior
  3. Generic substitution is permitted when the product is AB-rated and state law allows it Correct answer.
  4. Generic substitution is never permitted

Explanation

FDA AB-rated generic products are considered therapeutically equivalent to the brand product, and state law governs whether pharmacist substitution is permitted. The pharmacist must follow those rules and any patient consent requirements.

Question 20General Pharmacy Practice and Dispensing

Which practice best supports accurate counting and dispensing of solid oral dosage forms?

  1. Counting multiple drugs on the same tray without cleaning
  2. Using a dedicated counting tray cleaned between different drugs Correct answer.
  3. Estimating the count visually
  4. Mixing different tablets in the same stock container

Explanation

A dedicated tray cleaned between drugs prevents cross-contamination and mix-ups. Visual estimation and mixing stock containers increase the risk of count errors and contamination.

Question 21General Pharmacy Practice and Dispensing

A patient with chronic kidney disease is prescribed a renally cleared drug. Which adjustment approach is most appropriate?

  1. Discontinue all medications without prescriber input
  2. Use the standard adult dose regardless of renal function
  3. Estimate creatinine clearance and adjust the dose or interval according to the drug's labeling Correct answer.
  4. Double the dose to compensate for reduced clearance

Explanation

Renally cleared drugs often require dose or interval adjustment based on estimated creatinine clearance. Applying the labeled renal dosing recommendations prevents accumulation and toxicity.

Question 22General Pharmacy Practice and Dispensing

A prescription is illegible and appears to read either "Lamictal" or "Lamisil." What is the safest course of action?

  1. Dispense both drugs to cover the possibilities
  2. Ask the patient to choose which drug to receive
  3. Dispense Lamictal because it is alphabetically first
  4. Contact the prescriber to confirm the intended drug and indication Correct answer.

Explanation

Illegible prescriptions for look-alike names must be clarified with the prescriber to confirm the intended drug and indication. Guessing or asking the patient to choose bypasses the prescriber's clinical decision.

Question 23General Pharmacy Practice and Dispensing

A pharmacist notices that a high-alert medication is prepared for a pediatric patient at a dose tenfold higher than the weight-based calculation suggests. What is the most appropriate action?

  1. Document the concern after dispensing
  2. Reduce the dose by half without contacting anyone
  3. Hold the preparation and verify the calculation with the prescriber before dispensing Correct answer.
  4. Dispense the dose as written to avoid delaying therapy

Explanation

A tenfold discrepancy in a high-alert pediatric medication requires the pharmacist to stop and verify with the prescriber before dispensing. Independent confirmation is a standard safeguard against catastrophic dosing errors.

Question 24General Pharmacy Practice and Dispensing

A patient is prescribed a medication that interacts with grapefruit juice. Which counseling statement is most accurate?

  1. Grapefruit juice can inhibit intestinal CYP3A4 and increase exposure to some drugs Correct answer.
  2. Grapefruit juice always decreases drug absorption to zero
  3. Grapefruit juice has no effect on drug metabolism
  4. Grapefruit juice affects only antibiotics and not other drugs

Explanation

Grapefruit juice inhibits intestinal CYP3A4, which can raise systemic exposure to drugs metabolized by that enzyme. The effect is drug-specific and can increase adverse effects.

Question 25General Pharmacy Practice and Dispensing

A patient on lithium presents with tremor, confusion, and vomiting after starting a new NSAID. What is the most likely explanation?

  1. The NSAID improved lithium elimination
  2. The NSAID reduced lithium clearance, raising lithium levels toward toxicity Correct answer.
  3. The NSAID directly caused a lithium deficiency
  4. The symptoms are unrelated to the medication regimen

Explanation

NSAIDs can reduce renal lithium clearance, leading to elevated lithium levels and toxicity. The presenting symptoms are consistent with lithium toxicity and require urgent evaluation.

Question 26General Pharmacy Practice and Dispensing

A prescription for amoxicillin oral suspension 250 mg/5 mL is written for a 20 kg child at 40 mg/kg/day divided into two doses. The pharmacy stocks only 400 mg/5 mL suspension. What volume should be dispensed per dose?

  1. 4 mL
  2. 3.125 mL
  3. 6.25 mL Correct answer.
  4. 5 mL

Explanation

The total daily dose is 20 kg × 40 mg/kg = 800 mg/day, so each of two doses contains 400 mg. With a 400 mg/5 mL concentration, 400 mg corresponds to exactly 5 mL, but the question asks for the volume per dose from the stocked product, which is 5 mL; however, the child needs 400 mg per dose and the stock is 400 mg/5 mL, giving 5 mL. Rechecking: 800 mg/day ÷ 2 = 400 mg per dose; 400 mg ÷ 80 mg/mL = 5 mL. The correct volume is 5 mL.

Question 27General Pharmacy Practice and Dispensing

A prescriber orders morphine sulfate 10 mg IV every 4 hours for a patient already receiving oral morphine 30 mg every 4 hours. Which principle should guide the pharmacist's response?

  1. IV morphine is roughly three times as potent as oral morphine, so the IV dose should be reduced accordingly Correct answer.
  2. Oral morphine has higher bioavailability, so the IV dose should be increased
  3. IV and oral morphine are equipotent, so the order can be dispensed as written
  4. The route change requires no adjustment because the interval is unchanged

Explanation

Oral morphine undergoes extensive first-pass metabolism, so its bioavailability is roughly 30%, making IV morphine about three times as potent per milligram. A prescriber converting a patient from oral to IV morphine at the same milligram dose risks serious respiratory depression. The pharmacist should clarify the order and recommend an appropriate reduced IV dose.

Question 28General Pharmacy Practice and Dispensing

A patient asks the pharmacist why the same drug costs more under a brand name than as a generic. Which explanation is most accurate?

  1. Generic drugs are not reviewed by the regulatory authority for efficacy
  2. Brand products are always manufactured to higher quality standards
  3. Generic manufacturers do not need to repeat the costly clinical trials required for the original approval Correct answer.
  4. Generic products contain a different active ingredient that is cheaper to manufacture

Explanation

Generic manufacturers must demonstrate bioequivalence to the reference product but do not repeat the full preclinical and clinical trials that established safety and efficacy. This reduced development cost is a major reason generic prices are lower. Generic products contain the same active ingredient and must meet the same quality standards.

Question 29General Pharmacy Practice and Dispensing

A prescription reads "metoprolol 50 mg po BID #60, refills 2." What does the pharmacist record as the total quantity authorized if all refills are dispensed?

  1. 180 tablets Correct answer.
  2. 120 tablets
  3. 60 tablets
  4. 240 tablets

Explanation

The initial fill is 60 tablets, and two refills of 60 tablets each add 120 tablets. The total quantity authorized across the original fill and all refills is 60 + 120 = 180 tablets. The refill count multiplies the original quantity, not the number of doses per day.

Question 30General Pharmacy Practice and Dispensing

A patient on a stable dose of levothyroxine is started on ferrous sulfate for iron deficiency. What is the most appropriate counseling point?

  1. Take both medications together to improve adherence
  2. Take the iron supplement with levothyroxine and monitor for palpitations
  3. Double the levothyroxine dose while on iron
  4. Separate the two medications by at least four hours because iron reduces levothyroxine absorption Correct answer.

Explanation

Ferrous sulfate and other polyvalent cations bind levothyroxine in the gut and reduce its absorption, which can lower thyroid hormone levels. Separating administration by at least four hours minimizes this interaction. Thyroid function should also be monitored after starting iron therapy.

Question 31General Pharmacy Practice and Dispensing

A pharmacist receives a prescription for a controlled substance that lacks the prescriber's DEA number. What is the most appropriate action?

  1. Verify the prescriber's DEA registration and obtain the missing information before dispensing Correct answer.
  2. Dispense only a partial quantity and refer the patient elsewhere
  3. Dispense the prescription and add the DEA number later from memory
  4. Refuse to fill the prescription permanently and report the prescriber

Explanation

A valid prescription for a controlled substance must include the prescriber's DEA registration number. The pharmacist should verify the prescriber's registration and obtain the missing element rather than guessing or dispensing an incomplete order. Permanent refusal and reporting are not warranted for a correctable omission.

Question 32General Pharmacy Practice and Dispensing

Which storage condition is most appropriate for insulin vials that have not yet been opened?

  1. Stored at room temperature above 30 degrees Celsius
  2. Refrigerated at 2 to 8 degrees Celsius, protected from freezing Correct answer.
  3. Frozen at minus 20 degrees Celsius for long-term storage
  4. Kept in direct sunlight to maintain potency

Explanation

Unopened insulin vials should be refrigerated between 2 and 8 degrees Celsius and must never be frozen, because freezing denatures the protein. Once in use, many products may be kept at room temperature for a limited period specified by the manufacturer. Heat, freezing, and light all degrade insulin.

Question 33General Pharmacy Practice and Dispensing

A patient brings in a prescription for a compounded ointment that requires trituration of a potent powder with a diluent. Why is geometric dilution used?

  1. To speed up dissolution of the powder in the base
  2. To ensure uniform distribution of a small amount of potent drug throughout the bulk powder Correct answer.
  3. To reduce the total volume of the preparation
  4. To sterilize the powder during mixing

Explanation

Geometric dilution involves adding the potent powder to an approximately equal volume of diluent, then repeatedly doubling the mixture with more diluent. This technique ensures that a small quantity of active drug is evenly distributed and avoids pockets of high concentration. It is a uniformity technique, not a sterilization or volume-reduction step.

Question 34General Pharmacy Practice and Dispensing

A prescription is written for a medication whose usual adult dose is 500 mg every 12 hours, but the order reads 500 mg every 12 hours for a patient with a creatinine clearance of 25 mL/min for a renally eliminated drug. What should the pharmacist do?

  1. Review the renal dosing recommendations and contact the prescriber about a dose or interval adjustment Correct answer.
  2. Increase the interval to every 6 hours
  3. Dispense as written because the dose matches the usual adult dose
  4. Halve the dose without contacting the prescriber

Explanation

For renally eliminated drugs, a creatinine clearance of 25 mL/min often requires a reduced dose or lengthened interval to avoid accumulation and toxicity. The pharmacist should consult renal dosing references and discuss an adjustment with the prescriber rather than dispensing an unadjusted adult dose. Unilateral changes without prescriber communication are inappropriate.

Question 35General Pharmacy Practice and Dispensing

Which auxiliary label is most important to apply to a suspension of oral amoxicillin dispensed to a child?

  1. Shake well before each use Correct answer.
  2. Do not eat for two hours after each dose
  3. Keep in direct sunlight
  4. Take with plenty of dairy products

Explanation

Oral suspensions settle during storage, so patients must shake the bottle well before each dose to ensure the measured volume contains the intended amount of drug. Dairy products do not improve amoxicillin absorption, and sunlight and food restrictions are not relevant requirements. Consistent resuspension protects against under- or overdosing.

Question 36General Pharmacy Practice and Dispensing

A patient reports that a newly dispensed warfarin tablet looks different from the previous supply. The pharmacist confirms the product is the same strength from a different manufacturer. What is the most appropriate action?

  1. Reassure the patient that no monitoring is needed because the strength is unchanged
  2. Tell the patient to stop taking the medication until the original brand is available
  3. Explain that generic warfarin products are interchangeable but advise continued INR monitoring after the change Correct answer.
  4. Double the dose to compensate for the appearance change

Explanation

Warfarin has a narrow therapeutic index, and although bioequivalent generic products are interchangeable, a product change can slightly alter INR in sensitive patients. The pharmacist should explain the substitution and reinforce INR monitoring. Stopping therapy or changing the dose without indication is unsafe.

Question 37General Pharmacy Practice and Dispensing

A pharmacist is verifying a prescription for methotrexate 2.5 mg tablets written as "2.5 mg po daily" for a patient with rheumatoid arthritis. What concern should prompt clarification?

  1. Methotrexate should never be given orally for rheumatoid arthritis
  2. The 2.5 mg tablet strength is not commercially available
  3. Methotrexate requires no monitoring when used for arthritis
  4. Methotrexate for rheumatoid arthritis is typically dosed weekly, so a daily order may represent a dangerous error Correct answer.

Explanation

Methotrexate for inflammatory arthritis is conventionally given once weekly, and daily dosing errors have caused serious toxicity. The pharmacist should verify the intended schedule with the prescriber before dispensing. Oral tablets are standard therapy, and regular monitoring of blood counts and liver enzymes is required.

Question 38General Pharmacy Practice and Dispensing

Which action best ensures that a patient understands how to use a metered-dose inhaler with a spacer for the first time?

  1. Hand the patient the manufacturer's package insert without discussion
  2. Tell the patient to read the label at home
  3. Ask the patient to watch a video after the first dose
  4. Provide a teach-back demonstration and have the patient show the technique before leaving Correct answer.

Explanation

Teach-back with a demonstration and return demonstration confirms that the patient can correctly assemble and use the inhaler and spacer. Handing over a leaflet or video alone does not verify technique. Incorrect technique is a common cause of treatment failure with inhaled therapy.

Question 39General Pharmacy Practice and Dispensing

A patient with a documented sulfa allergy is prescribed sulfasalazine for ulcerative colitis. What is the most appropriate pharmacist action?

  1. Dispense the medication because sulfasalazine is not a sulfonamide
  2. Refuse to dispense any medication for this patient
  3. Clarify the nature of the prior reaction and consult the prescriber about the risk before dispensing Correct answer.
  4. Substitute an unrelated antibiotic without contacting the prescriber

Explanation

Sulfasalazine contains a sulfonamide moiety, so a reported sulfa allergy warrants clarification of the prior reaction and discussion with the prescriber. The severity and type of reaction determine the risk, and the decision should be documented. Reflexive refusal or unauthorized substitution is not appropriate.

Question 40General Pharmacy Practice and Dispensing

A prescription for a Schedule II stimulant is presented 45 days after the date it was written, and state law sets no different limit. Under federal rules, what is the pharmacist's most appropriate action?

  1. Dispense it because Schedule II prescriptions never expire
  2. Do not dispense, because a Schedule II prescription may not be filled more than 30 days after the date written Correct answer.
  3. Dispense it as a refill authorized by the original prescription
  4. Dispense it only after reducing the quantity by half

Explanation

Under federal regulations, a prescription for a Schedule II controlled substance may not be filled more than 30 days after the date it was issued, unless state law or an exception applies. Schedule II prescriptions also may not be refilled. The pharmacist should not dispense an expired Schedule II order without confirming an applicable exception.

Question 41Pharmacology and Pharmacotherapy

Which pharmacokinetic parameter is defined as the fraction of an administered drug dose that reaches the systemic circulation unchanged?

  1. Half-life
  2. Bioavailability Correct answer.
  3. Clearance
  4. Volume of distribution

Explanation

Bioavailability (F) expresses the proportion of a dose reaching systemic circulation intact, and for intravenous dosing it is defined as 1. It captures losses from incomplete absorption and first-pass hepatic metabolism, which is why oral F is usually lower than intravenous F.

Question 42Pharmacology and Pharmacotherapy

A patient develops bronchospasm after receiving a non-selective beta-blocker. Which receptor subtype is primarily responsible for beta-2-agonist-mediated bronchodilation that is blocked by this drug?

  1. Alpha-1
  2. Beta-2 Correct answer.
  3. Beta-1
  4. Alpha-2

Explanation

Beta-2 receptors on airway smooth muscle mediate bronchodilation, so non-selective beta-blockers that block beta-2 can precipitate bronchospasm in susceptible patients. Beta-1 receptors predominate in the heart, while alpha receptors mediate vasoconstriction and other effects.

Question 43Pharmacology and Pharmacotherapy

Which laboratory monitoring is most appropriate for a patient starting long-term amiodarone therapy?

  1. Serum potassium only
  2. Thyroid function and liver enzymes Correct answer.
  3. Serum amylase
  4. Serum creatinine only

Explanation

Amiodarone accumulates in tissue and can cause thyroid dysfunction and hepatotoxicity, so baseline and periodic thyroid function tests and liver enzymes are recommended. Pulmonary toxicity and corneal deposits also occur but are detected by other means.

Question 44Pharmacology and Pharmacotherapy

Which mechanism best explains why omeprazole reduces gastric acid secretion?

  1. Blockade of histamine H2 receptors on parietal cells
  2. Neutralization of gastric acid by a basic salt
  3. Blockade of muscarinic M3 receptors
  4. Irreversible inhibition of the parietal cell H+/K+-ATPase Correct answer.

Explanation

Proton pump inhibitors such as omeprazole are prodrugs activated in acidic canaliculi and covalently bind the H+/K+-ATPase, shutting down the final common pathway of acid secretion. This irreversible inhibition explains their prolonged effect beyond plasma half-life.

Question 45Pharmacology and Pharmacotherapy

A patient on warfarin develops an INR of 7.5 without bleeding. Which intervention is most appropriate for rapid reversal of the anticoagulant effect?

  1. Subcutaneous enoxaparin
  2. Oral vitamin K1 plus fresh frozen plasma or prothrombin complex concentrate Correct answer.
  3. Intravenous heparin
  4. Oral aspirin

Explanation

For a markedly elevated INR, vitamin K1 restores gamma-carboxylation of clotting factors, and factor replacement with prothrombin complex concentrate or fresh frozen plasma provides immediate hemostatic support. Heparin, aspirin, and low-molecular-weight heparin would worsen bleeding risk rather than reverse warfarin.

Question 46Pharmacology and Pharmacotherapy

Which adverse effect is most characteristic of aminoglycoside antibiotics such as gentamicin?

  1. Photosensitivity rash
  2. Aplastic anemia
  3. Nephrotoxicity and ototoxicity Correct answer.
  4. Hepatitis

Explanation

Aminoglycosides accumulate in proximal tubular cells and cochlear hair cells, producing dose-related nephrotoxicity and vestibular or cochlear ototoxicity. Serum levels and renal function should be monitored to limit these effects.

Question 47Pharmacology and Pharmacotherapy

Which drug is the first-line pharmacologic treatment for an adult with newly diagnosed type 2 diabetes and no contraindications?

  1. Metformin Correct answer.
  2. Pioglitazone
  3. Insulin glargine
  4. Glipizide

Explanation

Metformin is recommended as initial therapy because it lowers hepatic glucose production, is weight-neutral, and has a low risk of hypoglycemia. It is started early and continued unless renal function or intolerance requires a change.

Question 48Pharmacology and Pharmacotherapy

Which statement correctly describes the mechanism of action of statins?

  1. They increase hepatic LDL receptor expression by binding bile acids
  2. They inhibit HMG-CoA reductase, reducing hepatic cholesterol synthesis Correct answer.
  3. They activate lipoprotein lipase
  4. They block intestinal cholesterol absorption

Explanation

Statins competitively inhibit HMG-CoA reductase, the rate-limiting enzyme in cholesterol synthesis. The resulting fall in hepatic cholesterol upregulates LDL receptors, increasing clearance of LDL from plasma.

Question 49Pharmacology and Pharmacotherapy

A patient taking phenelzine, a monoamine oxidase inhibitor, eats aged cheese and develops severe hypertension. Which mechanism explains this reaction?

  1. Blockade of alpha-1 receptors
  2. Direct beta-2 receptor stimulation
  3. Increased tyramine release of stored norepinephrine Correct answer.
  4. Increased vagal tone

Explanation

Aged cheese contains tyramine, which normally is degraded by monoamine oxidase in the gut and liver. When MAO is inhibited, tyramine reaches adrenergic nerve terminals and displaces stored norepinephrine, producing a hypertensive crisis.

Question 50Pharmacology and Pharmacotherapy

Which electrolyte abnormality most strongly predisposes a patient taking digoxin to toxicity?

  1. Hypernatremia
  2. Hypercalcemia
  3. Hyperkalemia
  4. Hypokalemia Correct answer.

Explanation

Hypokalemia enhances digoxin binding to the Na+/K+-ATPase, increasing the risk of arrhythmias even at therapeutic digoxin levels. Potassium should be corrected and monitored, especially when diuretics are co-prescribed.