A nurse is providing discharge instructions to a client who has a complicated urinary tract infection (UTI) and is taking ciprofloxacin, a quinolone antiinfective. Which of the following instructions should the nurse give to the client?

A. "If the medicine causes an upset stomach, take an antacid at the same time.": Ciprofloxacin should not be taken with antacids containing magnesium or aluminum because these reduce the medication’s absorption and effectiveness. B. "Limit your daily fluid intake while taking this medication.": Clients should be encouraged to increase, not limit, fluid intake when taking ciprofloxacin. Adequate hydration helps prevent crystalluria and protects renal function. C. "This medication will affect your eyesight, wear sunglasses while outside.": Ciprofloxacin does not typically cause vision changes or photosensitivity requiring sunglasses. It is not a significant or common side effect of quinolones. D. "You should report any discomfort in your tendons while taking this medication.": Ciprofloxacin carries a risk for tendinitis and tendon rupture, especially in older adults and those taking corticosteroids. Reporting tendon pain early allows the healthcare provider to discontinue the drug and prevent permanent tendon damage.