Astringent agent

An astringent agent is a chemical substance that induces the contraction or shrinkage of body tissues, typically when applied topically to the skin or mucous membranes. This effect is achieved through a non-specific biochemical process where the agent causes the precipitation of proteins on the surface of the tissue, creating a protective layer and reducing fluid discharge. Astringents are not specific molecular targets like receptors or enzymes; rather, they represent a broad pharmacological class that includes metal salts like aluminum or zinc, and organic compounds like tannins found in witch hazel. Biologically, they serve to promote hemostasis in minor cuts, reduce inflammation by constricting local capillaries, and dry up secretions in conditions like hyperhidrosis or oozing dermatitis. Because their action is based on physical-chemical interactions with surface proteins rather than specific binding sites, they are used primarily as therapeutic tools in dermatology and minor wound care.

Other names

StypticTissue-contracting agentAstringent

Astringents primarily function by precipitating proteins at the surface of the skin or mucous membranes, which leads to the shrinkage of tissues and the constriction of small blood vessels (vasoconstriction).