Duphill M 400mg/10mg Tablet is used in treatment and prevention of asthma. It works by relaxing the muscles in the air passageways, expanding them and making breathing easier. It also helps with allergy symptoms such a stuffy nose, sneezing, throat irritation, watery eyes, and congestion. Duphill M 400mg/10mg Tablet is taken with food, according to the doctor's instructions. The dose you receive will be determined by your medical condition and how you react to the medicine. You should continue to take this medicine for as long as your doctor advises. If you stop taking your medicine too soon, your symptoms may return and your condition may deteriorate. Tell your doctor about all other medicine you're taking, as some may interact with or be affected by this one.