Anesthesia medications are used to numb specific areas during surgery or relax certain muscles. Some work by blocking nerve signals in your body to prevent pain sensations. Others work by blocking acetylcholine from contracting your muscles. Common classes include local anesthetics and neuromuscular blockers. Local anesthetics like lidocaine (Xylocaine) and bupivacaine (Marcaine) can be found in injectable forms. Neuromuscular blockers, such as succinylcholine (Anectine), are typically also administered as injections. These medications offer various ways to help manage pain and making surgery more comfortable.