In most cases, it should be taken daily. When you are having an asthma episode, the muscles around your airways tighten. This is called bronchospasm.
Bronchodilators relax the muscles and relieve the bronchospasm.
However, during an asthma episode, the inside walls of the airways also get swollen and the thin layer of mucus becomes thicker, which makes it even harder to breathe. Cromolyn, or Intal prevents the swelling inside the airways before it starts and stop the mucus from forming when caused by allergens, exercise and other common triggers. Cromolyn is safe to use in the treatment of asthma. The only known side effect is a dry cough moments after taking the medicine. You can avoid this side effect by rinsing your mouth and drinking a few sips of water after taking it.