Did you ever wonder how antihistamines work? Anti-histamine counteract or neutralize histamine, by blocking histamine receptors in your body. Histamine is produced by mast cells which are the cells that protect your body from foreign invaders. When your mast cells notice an antigen enter your body it produces the protein we call histamine, histamine will cause itchy watery eyes and nose and constriction of the airway passages. The antihistamine blocks your body from accepting the message from the histamine.

Since the antihistamine does not know which receptors to block, it will block some that are important to normal function or may not block the ones that it needs to. Histamine is important to sleep and sexual response in the body as well and when blocked you can have adverse reactions to antihistamines. That is why it is important to follow the labels and contact your doctor if you have any adverse reactions.

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