The nurse is administering muscle relaxant baclofen by mouth (PO) to a client diagnosed with multiple sclerosis. Which intervention is the most important for the nurse to implement?

Choice A reason: Baclofen is a muscle relaxant that can cause drowsiness, dizziness, and orthostatic hypotension. These side effects can increase the risk of falls and injuries for the client. Therefore, the nurse should advise the client to move slowly and cautiously when rising and walking, and to use assistive devices if needed.Choice B reason: Evaluating muscle strength every 4 hours is not the most important intervention for the nurse to implement, as baclofen does not affect muscle strength directly. It may reduce muscle spasticity and stiffness, but it does not improve muscle function or coordination.Choice C reason: Monitoring intake and output every 8 hours is not the most important intervention for the nurse to implement, as baclofen does not have a significant effect on fluid balance or renal function. However, the nurse should monitor the client for signs of urinary retention, which is a rare but possible adverse effect of baclofen.Choice D reason: Ensuring the client knows to stop baclofen before using other antispasmodics is not the most important intervention for the nurse to implement, as baclofen can be used in combination with other antispasmodics under medical supervision. However, the nurse should educate the client about the potential drug interactions and contraindications of baclofen, and to consult the prescriber before taking any new medications.