Pyrovalerone is a stimulant drug that has been used as an appetite suppressant and for the treatment of attention deficit hyperactivity disorder (ADHD). There are a few known synonyms for pyrovalerone, including α-pyrrolidinopentiophenone (α-PVP), 4'-methyl-α-pyrrolidinopropiophenone (MPPP), and β-keto-prolintane (BKP). These compounds possess similar chemical structures and pharmacological properties, and are often referred to as "bath salts" because they are typically sold in drug paraphernalia shops in packets labeled as bath salts or plant food. Pyrovalerone and its analogs are highly addictive, and can cause a range of physical and psychological problems, including seizures, hallucinations, and paranoia. They are illegal in most countries and are considered to be a serious public health concern.