<p>Protective effect applies only to the urinary tract; pregnancy, lactation. Patients with auto-immune disorders. IV formulation may contain benzyl alcohol as a preservative; avoid in neonates or infants. Instruct patients to seek medical attention if discolouration of urine occurs. During treatment, monitor urine for erythrocytes and haematuria. Maintain adequate hydration in all patients. Patients who vomit within 2 hr of oral dose should repeat dose or receive IV dose.</p>