<p>Uncontrolled use of Naphazoline &amp; Zinc over extended periods of time should be avoided. If no improvement is seen after 2 days, treatment should be discontinued and other therapeutic measures should be considered. If ocular discomfort or visual disturbance occurs during Naphazoline &amp; Zinc treatment, the therapy must be discontinued. Caution is indicated in patients with predisposition to glaucoma and in patients suffering from hypertension, cardiovascular diseases, pheochromocytoma, aneurysm, hyperglycemia, and hyperthyroidism.</p>