A patient with a UTI is prescribed ciprofloxacin. Which statement indicates a contraindication for this medication?

The statement indicating a contraindication for ciprofloxacin is the one about having tendonitis. Ciprofloxacin belongs to a class of antibiotics known as fluoroquinolones, which are associated with an increased risk of tendon damage, including tendon rupture. This risk is particularly pronounced in patients who have a history of tendon disorders, such as tendonitis, or in those who are older, are taking corticosteroids, or have renal impairment. Therefore, a patient reporting tendonitis poses a significant risk when prescribed ciprofloxacin, warranting careful consideration or possibly an alternative treatment.

The other statements do not present contraindications. The use of a stool softener for chronic constipation is unrelated to the actions or side effects of ciprofloxacin. Taking medicine for a thyroid condition also does not conflict with the use of ciprofloxacin. An allergy to sulfa medications does not contraindicate the use of ciprofloxacin, as these are different classes of drugs; ciprofloxacin is not a sulfonamide.