felis catus hair

**Felis catus hair** is a standardized allergenic extract biologic derived from domestic cat hair and used as an allergen immunotherapy and diagnostic skin-test reagent for cat allergy. Developed and marketed in the United States by **Nelco Laboratories**, this BLA-regulated product is standardized in **Bioequivalent Allergy Units per mL** and administered by **intradermal** skin testing for diagnosis and **subcutaneous** injection for desensitization therapy. Its pharmacologic effect is not conventional receptor agonism or antagonism; rather, it exposes patients to cat allergen proteins to identify or modulate **IgE-mediated hypersensitivity** to cat allergens, with use in patients with allergic rhinitis, allergic conjunctivitis, and allergic asthma when cat avoidance is not feasible.

Brand names

Standardized Cat Hair

Other names

felis catus haircat hair extractstandardized cat hair extract