Methcathinone, known on the streets as “Cat,” is a structural analogue 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.