Flixotide evohaler contains the medicine fluticasone propionate which belongs to a group of medicines called corticosteroids more commonly known as steroids flixotide works by reducing swelling and irritation in the lungs it has what is called an anti inflammatory action flixotide helps to prevent asthma attacks in people who need regular treatment this is why it is sometimes called a preventer it needs to be used regularly every day flixotide will not help treat sudden asthma att