Final answer:
The nurse will monitor the patient for indicators of potential toxicity when on aminoglycoside therapy, including tinnitus and dizziness and decreased blood urea nitrogen levels.
Step-by-step explanation:
When a patient is on aminoglycoside therapy, the nurse will monitor the patient for indicators of potential toxicity. One such indicator is tinnitus and dizziness. Aminoglycosides are known to be ototoxic, meaning they can cause damage to the ears. Another indicator is decreased blood urea nitrogen (BUN) levels. Aminoglycosides can impair kidney function, leading to decreased BUN levels. Fever and white blood cell count are not direct indicators of aminoglycoside toxicity.