Ketotifen is the prescription medicine used to prevent the symptoms of asthma. It helps to reduce number and severity of the asthma attacks by decreasing inflammation (swelling) in the lungs. Ketotifen can be taken with or without food, but take it at the same time to get the most benefit. It should be taken as your doctor's advice. The dose and how often you take it depends on what you are taking it for. Your doctor will decide how much you need to improve your symptoms. Swallow the tablets whole with a drink of water. You should take this medicine...