Definition: Anesthetics are drugs that reduce pain, typically by inhibiting nerve impulses or interfering with sensory feedback. Definition: - Anesthetics: A type of medication that helps to reduce pain, nausea, or other unpleasant sensations. They work by blocking a chemical in the body called acetylcholine, which causes muscle movements and senses like touch, taste, smell, and hearing. - Common anesthetics include: phenobarbital, diazepam (Valium), and lorazepam (Zoloft).