Sedative

A sedative or tranquilizer (or tranquilliser, see American and British English spelling differences) is a substance that induces sedation by reducing irritability[1] or excitement. At higher doses it may result in slurred speech, staggering gait, poor judgment, and slow, uncertain reflexes. Doses of sedatives such as benzodiazepines when used as a hypnotic to induce sleep tend to be higher than those used to relieve anxiety whereas only low doses are needed to provide calming sedative effects.