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Diphenhydramine is an antihistamine that reduces the effects of natural chemical histamine in the body. Histamine can produce symptoms of sneezing, itching, watery eyes, and runny nose.
Diphenhydramine is used to treat sneezing, runny nose, watery eyes, hives, skin rash, itching, and other cold or allergy symptoms.
Diphenhydramine is also used to treat motion sickness, to induce sleep, and to treat certain symptoms of Parkinson's disease.
One word... Anaphylaxis. Severe allergic reaction most commonly associated with bee stings, but can also be caused by peanuts, shellfish and many other things. Anaphylaxis causes approximatly 1,500 deaths a year. Diphen when administered correctly can save a life. Diphen is normally administered as a pill, however in the case of anaphylaxis you will need to chew the tablet and allow it to be absorbed through the gums and mouth, as this is a much faster and more direct form of delivery.