A nurse is teaching a client who has a urinary tract infection (UTI) and is taking ciprofloxacin. 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." – Antacids that contain calcium, magnesium, or aluminum can interfere with the absorption of ciprofloxacin. They should be taken separately by at least 2 hours. B. "You should report any tendon discomfort you experience while taking this medication." – Ciprofloxacin, a fluoroquinolone antibiotic, is associated with an increased risk of tendinitis and tendon rupture, especially in older adults or those on corticosteroids. Any tendon pain should be reported immediately. C. "Limit your daily fluid intake while taking this medication." – Clients should be encouraged to increase fluid intake to help flush bacteria from the urinary tract and reduce the risk of crystalluria, a rare side effect of ciprofloxacin. D. "This medication can cause photophobia, so be sure to wear sunglasses outdoors." –Photophobia is not a known adverse effect of ciprofloxacin. Photosensitivity (sunburn risk), however, can occur, and clients should be advised to use sunscreen—not sunglasses—as a primary precaution.