Final answer:
The practical nurse (PN) should reinforce the instruction to the 67-year-old client to take the prescribed dosage of digoxin (Lanoxin) 0.25 mg daily.
Step-by-step explanation:
The practical nurse (PN) should reinforce the instruction to the 67-year-old client to take the prescribed dosage of digoxin (Lanoxin) 0.25 mg daily. Digoxin is a medication used to treat heart failure and certain irregular heart rhythms. It works by strengthening the heart muscle and regulating the heartbeat. However, it is important for the client to understand that taking the medication as prescribed is crucial for its effectiveness and safety.