Methcathinone, known on the streets as “Cat,” is a structural analog of methamphetamine and cathinone. Clandestinely manufactured, “Cat” is almost exclusively sold in the stable and highly water-soluble hydrochloride salt form. It is most commonly snorted, although it can be taken orally by mixing it with a beverage or diluted in water and injected intravenously. “Cat” has an abuse potential equivalent to methamphetamine and produces amphetamine-like activity. It was placed in Schedule I of the CSA in 1993.