Xylometazoline is a nasal decongestant commonly used to relieve nasal congestion caused by conditions such as the common cold, sinusitis, or allergies. It works by constricting the blood vessels in the nasal passages, which reduces swelling and congestion, allowing for easier breathing through the nose. Xylometazoline is typically used as a nasal spray and provides temporary relief, usually within a few minutes, lasting for several hours. It is important to follow dosing instructions carefully to avoid overuse, as prolonged use can lead to rebound congestion, a condition where nasal congestion worsens after the medication wears off.