Correct Answer: A

Rationale: Orthostatic hypotension is a known adverse effect of Phenelzine, a monoamine oxidase inhibitor (MAOI) used for depression. It is caused by a sudden drop in blood pressure when changing positions, leading to symptoms like dizziness or fainting. Monitoring for orthostatic hypotension is crucial during Phenelzine therapy to prevent complications.

Correct Answer: A

Rationale: The correct answer is folic acid. Methotrexate is a folic acid antagonist, so instructing the client to take folic acid helps reduce the risk of methotrexate toxicity by providing additional folic acid that the medication may deplete.

Correct Answer: A

Rationale: To calculate the volume to administer, use the formula: (Desired dose / Concentration) = Volume to administer. In this case, (15,000 units / 20,000 units/mL) = 0.75 mL, which is rounded up to 0.8 mL. Therefore, the healthcare professional should administer 0.8 mL per dose of heparin.

Correct Answer: C

Rationale: In a client receiving Magnesium Sulfate IV for Preeclampsia, a urinary output less than 25 to 30 mL/hr indicates magnesium sulfate toxicity and should be reported to the provider for further evaluation and management.

Correct Answer: B

Rationale: The nurse should instruct the client to report fever as it can be an indication of an infection, which is a potential complication of rituximab therapy. Monitoring for fever is crucial to promptly address any signs of infection and ensure the client's safety during treatment.