When an individual experiences an allergic reaction because of some type of allergen they have come into contact with, the body begins to produce what is called histamines, and then mast cells begin to form in various areas of the body. These mass cells will usually end up in areas that are prone to being exposed to outside intruders and when this happens, the individual will begin to experience the annoying symptoms that go along with experiencing an allergic reaction. To work to their best ability, the use of mass cell inhibitors should be started approximately two weeks before the allergy season begins. Then, the allergy sufferer will need to continue taking it every single day to keep the symptoms of allergies at bay. The way they work is by preventing the body from releasing the histamines that cause the mass cells to bother the individual with frustrating allergy symptoms when contact has been made with allergens. To ensure optimum relief from mass cell inhibitors, you should speak with your family physician about any possible side effects and drug interactions that they can cause.