Abirritants consist of a large group of drugs belonging to different classes with varying mechanisms to treat itch. They may work either directly or indirectly to relieve itch, and evidence on their effectiveness varies from one class to another.[3] Some alternative medicines are also used to treat itch.[4][5] Side effects of abirritants also vary depending on the class of the drug. Even before the emergence of modern evidence-based medicine, abirritants have already been used in many civilizations, but practices and choice of drugs may differ by culture.[6]
^Weisshaar E, Grüll V, König A, Schweinfurth D, Diepgen TL, Eckart WU (December 2009). "The symptom of itch in medical history: highlights through the centuries". International Journal of Dermatology. 48 (12): 1385–94. doi:10.1111/j.1365-4632.2009.04117.x. PMID20415680. S2CID28909284.