Used as a nasal decongestant in over-the-counter cold and allergy medications due to its vasoconstrictive properties. It helps reduce swelling in the nasal passages, allowing easier breathing. Often found in oral tablets, nasal sprays, and liquid formulations. Provides temporary relief from sinus congestion and pressure. Works by constricting blood vessels in the nasal mucosa, which decreases blood flow and inflammation. Generally used for short-term relief and is often combined with antihistamines, analgesics, or cough suppressants in multi-symptom products.