Final answer:
Furosemide is the medication that increases the risk for ototoxicity when taken with tobramycin.
Step-by-step explanation:
The nurse should identify furosemide as a medication that increases the risk for ototoxicity when taken with tobramycin. Ototoxicity refers to damage to the structures within the ear, specifically the cochlea and vestibular system, leading to hearing loss and balance problems. Furosemide is a loop diuretic that is known to have ototoxic effects.