The nurse is preparing to administer medications to the following clients. Which medication should the nurse question administering?  1. The loop diuretic furosemide (Lasix) to the client with a serum...

The nurse is preparing to administer medications to the following clients. Which medication should the nurse question administering?

 1. The loop diuretic furosemide (Lasix) to the client with a serum potassium level of 4.2 mEq/L. 2. The osmotic diuretic mannitol (Osmitrol) to the client with a serum osmolality of 280 mOsm/kg. 3. The cardiac glycoside digoxin (Lanoxin) to the client with a digoxin level of 1.2 mg/dL. 4. The anticonvulsant phenytoin (Dilantin) to the client with a phenytoin (Dilantin) level of 24 μg/mL.