Correct Answer: A

Rationale: To verify trough levels of a medication, the healthcare professional should obtain a blood specimen immediately before administering the next dose of medication. This timing ensures an accurate representation of the medication's lowest concentration in the bloodstream, which is crucial for therapeutic monitoring and dose adjustments.

Correct Answer: B

Rationale: The nurse should monitor the client for hypertension as a common adverse effect of epoetin alfa, which stimulates red blood cell production and can lead to increased blood pressure.

Correct Answer: C

Rationale: Potassium 3.4 mEq/L is below the expected reference range, which increases the risk for digoxin toxicity. Low potassium levels can lead to fatal dysrhythmias, particularly in older clients taking Digoxin. Monitoring and correcting electrolyte imbalances are crucial to prevent adverse effects of digoxin therapy.

Correct Answer: C

Rationale: The correct answer is C. Brimonidine can absorb into soft contact lenses. To prevent this, the client should remove their contacts, instill the medication, and wait at least 15 minutes before putting the contacts back in to avoid potential absorption of the medication by the lenses.

Correct Answer: B

Rationale: The correct answer is to instruct the client to avoid taking additional Acetaminophen while on Oxycodone/Acetaminophen to prevent exceeding the maximum recommended dose and reducing the risk of liver toxicity. Oxycodone/Acetaminophen already contains Acetaminophen, so additional intake can lead to an overdose of this component.