Used primarily as a decongestant in over-the-counter eye drops to relieve redness caused by minor eye irritations. It works by constricting blood vessels in the eyes, reducing swelling and redness due to allergies, smoke, or prolonged use of contact lenses. Also found in some nasal sprays to reduce nasal congestion by shrinking swollen membranes in the nasal passages. Its vasoconstrictive action provides quick, temporary relief but is not intended for long-term use due to risk of rebound congestion or irritation.