While the old method of treating and preventing allergies involved simply avoiding the allergen causing them, latest improvements in medical science regarding this subject managed to create more effective drugs and treatments. There are some drugs that manage to prevent the activation of cells or deregulation processes: cortisone, adrenaline, theophylline, and hydrocortisone. Also, anti-leukotrienes (Montelukast or Zafirlukast) as well as a certain number of anti-cholinergic and decongestants are commonly used. Another way of treating allergies is immunotherapy, which means gradually vaccinating the patient with larger doses of allergen. This practice either completely eliminates or reduces dramatically the severity of the allergy.