Demerol is a brand name for the medication meperidine, which is an opioid pain medication. It's commonly prescribed to relieve moderate to severe pain, such as pain after surgery or during labor. Demerol works by binding to opioid receptors in the brain and spinal cord, which helps to reduce the perception of pain. However, like other opioid medications, Demerol can be habit-forming and has the potential for misuse, dependence, and overdose. It should be used cautiously and only as prescribed by a healthcare professional. Additionally, long-term use of Demerol can lead to tolerance and physical dependence, and sudden discontinuation can cause withdrawal symptoms. Therefore, it's typically recommended for short-term use to manage acute pain.