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How does an epipen work to help with a severe allergic reaction?

During anaphylaxis the immune system produces biochemical product that makes airways swollen and make fluid leaks from your blood vessel to your lungs. Epinephrine constricts the vessels, reduces swelling, and increase the blood pressure, causing the bronchi to dilate so you can breath again. Epinephrine is considered the major life-saving medicine for anaphylaxis.