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Pharmacist Flashcards

7 cards from real DHA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Pharmacist flashcards as text

  1. A patient is prescribed warfarin and starts taking clarithromycin for a respiratory infection. What is the most likely pharmacokinetic interaction?

    Answer: Clarithromycin inhibits CYP3A4 and CYP2C9, increasing warfarin levels

    Clarithromycin is a potent CYP3A4 and CYP2C9 inhibitor, which reduces warfarin metabolism and increases its anticoagulant effect, raising bleeding risk.

  2. Under DHA regulations, which category of medications requires a triplicate prescription in the UAE?

    Answer: Controlled substances (narcotics and psychotropics)

    UAE law requires controlled substances such as narcotics and psychotropics to be dispensed only on triplicate prescriptions issued by licensed practitioners.

  3. A pediatric patient weighing 20 kg requires amoxicillin at 40 mg/kg/day divided every 8 hours. What is the correct dose per administration?

    Answer: 267 mg

    Total daily dose = 40 mg/kg × 20 kg = 800 mg/day; divided every 8 hours gives 800 ÷ 3 ≈ 267 mg per dose.

  4. Which parameter best describes the fraction of an oral drug that reaches systemic circulation unchanged?

    Answer: Bioavailability

    Bioavailability (F) is defined as the fraction of an administered dose that reaches the systemic circulation in its active form.

  5. A patient on methotrexate for rheumatoid arthritis is also prescribed ibuprofen. What is the primary concern?

    Answer: NSAIDs reduce renal clearance of methotrexate, causing toxicity

    NSAIDs inhibit renal prostaglandin synthesis, reducing renal blood flow and tubular secretion of methotrexate, leading to methotrexate accumulation and toxicity.

  6. According to DHA pharmacy standards, what is the minimum required action when a pharmacist identifies a clinically significant prescribing error?

    Answer: Contact the prescribing physician before dispensing to clarify or correct the order

    DHA standards mandate that pharmacists contact the prescribing physician to resolve clinically significant errors before dispensing, ensuring patient safety.

  7. Which of the following is the mechanism of action of proton pump inhibitors (PPIs)?

    Answer: Irreversible inhibition of H+/K+-ATPase on parietal cells

    PPIs irreversibly inhibit the H+/K+-ATPase (proton pump) on the luminal surface of gastric parietal cells, blocking the final step of acid secretion.