An analgesic drug, also known as a PAINKILLER, is a medication used to reduce pain. It works by blocking pain signals from the brain or by changing the way the body perceives pain. Analgesic drugs can be taken orally, injected, or applied topically. Common types of analgesic drugs include opioids, non-steroidal anti-inflammatory drugs (NSAIDs), and acetaminophen. These drugs are used to treat a variety of conditions, including headaches, muscle pain, arthritis, and post-surgical pain.