A sedative or tranquilizer (or tranquilliser, see American and British English spelling differences) is a substance that induces sedation by reducing irritability or excitement. At higher doses it may result in slurred speech, staggering gait, poor judgment, and slow, uncertain reflexes.oses of sedatives such as benzodiazepines, when used as a hypnotic to induce sleep, tend to be higher than amounts used to relieve anxiety, whereas only low doses are needed to provide a peaceful effect.
1 Scab, a hard coating on the skin formed during the wound healing reconstruction phase.  scAb, single-chain antibody fragment.
Scabs form to create a barrier on the skin that serve a dual purpose when there is a cut or other injury that causes bleeding. The hard, reddish or brown formation keeps bacteria and other contaminants from entering the body from the outside, while inside white blood cells attack any that may have breached the wound prior to the formation of the clot and subsequent scab.