Antihistamine

An antihistamine is a type of pharmaceutical drug that opposes the activity of histamine receptors in the body.[1] Antihistamines are subclassified according to the histamine receptor that they act upon: the two largest classes of antihistamines are H1-antihistamines and H2-antihistamines. Antihistamines that target the histamine H1-receptor are used to treat allergic reactions in the nose (e.g., itching, runny nose, and sneezing) as well as for insomnia. They are sometimes also used to treat motion sickness or vertigo caused by problems with the inner ear.

Used to reduce itch when mites and other insects bite the skin.