something that causes an allergic reaction.
an exaggerated immune response.
a severe or life-threatening allergic reaction in which the blood vessels dilate, causing a drop in blood pressure, and the tissues lining the respiratory system swell, interfering with the airway. Also called anaphylactic shock.
a syringe pre-loaded with medication that has a spring-loaded device that pushes the needle through the skin when the tip of the device is pressed firmly against the body.
a hormone produced by the body. As a medication it dilates respiratory passages and is used to relieve severe allergic reactions.
red, itchy, possibly raised blotches on the skin that often result from allergic reactions.