CMA Pharmacology for Medical Assistants 3

Question 1

Which abbreviation on a prescription means 'take as needed'?

Accepted Answer

PRN

Answer

PRN (pro re nata) is the Latin abbreviation meaning 'as needed,' indicating the medication is taken only when required.

Question 2

A patient is prescribed digoxin and their potassium level is low. What is the primary concern?

Accepted Answer

Hypokalemia increases the risk of digoxin toxicity

Answer

Hypokalemia potentiates digoxin toxicity because potassium and digoxin compete for the same receptor site on heart cells.

Question 3

Which class of drugs works by blocking histamine H1 receptors to relieve allergy symptoms?

Accepted Answer

Antihistamines

Answer

Antihistamines competitively block H1 receptors, preventing histamine from binding and causing allergy symptoms like sneezing and itching.

Question 4

What is the correct method for disposing of an unused controlled substance in a medical office?

Accepted Answer

Return it to the pharmacy or use a DEA-approved disposal method

Answer

Federal regulations require controlled substances to be disposed of through DEA-authorized collectors or reverse distributors to prevent diversion.

Question 5

A physician orders 'amoxicillin 250 mg/5 mL, give 500 mg.' How many milliliters should be administered?

Accepted Answer

10 mL

Answer

Using the ratio: 250 mg/5 mL = 500 mg/x mL; cross-multiplying gives x = 10 mL.

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