Asthma is a condition in which your childâs airways become narrow and as a result, breathing becomes difficult. Montel 5mg Tablet works by reducing and preventing swelling and inflammation in your lungs. It is known as a âpreventerâ and is used to prevent the symptoms of asthma such as tightness in your chest, wheezing, breathlessness, and coughing. This means your child can carry out daily activities more easily and more confidently. It may take a few weeks for this medicine to show full effects. This medicine will not stop an asthma attack that has already started.