Doctors prescribe magic mouthwash (also called miracle mouthwash) to prevent or treat mouth sores caused by conditions like autoimmune diseases, viral infections, and cancer treatments. Unlike regular over-the-counter mouthwash, magic mouthwash contains a mix of medications that can include antibacterial, anesthetic, and antifungal ingredients. It's important to follow your doctor's instructions on how to use it. Generally, you should shake the bottle well, use about 10 milliliters (2 teaspoons) every 3 hours, and keep it in your mouth for 1 to 2 minutes before spitting it out. Avoid eating or drinking for at least half an hour after using it. The duration of use will depend on your specific condition and doctor's advice. Magic mouthwash can be expensive, costing between $34 to $50 for 8 ounces, and may not be covered by all insurance plans. While some studies show it can relieve pain from mouth sores, results vary. Alternatives like oral cryotherapy or homemade saltwater rinses may also help. Always consult your doctor for the best treatment option for you.