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.
A cold sore scab is a layer formed over the open cold sores mostly by the discharge that oozes out from the wounds and is always crusty and yellow in this case. This protective layer (scab) helps a lot in the healing process by providing a cover over the open sore as it (sore) continues to heal under.