Final answer:
Furosemide should be identified as increasing the risk for ototoxicity while taking tobramycin.
Step-by-step explanation:
The nurse should identify furosemide as increasing the risk for ototoxicity while taking tobramycin. Tobramycin is an aminoglycoside antibiotic that has the potential to cause damage to the inner ear, resulting in hearing loss and balance problems. Furosemide, a loop diuretic, can also cause ototoxicity as a side effect.