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Pain killers. View of pain killer pills spilling out of a bottle. The bottle is brown to prevent degradation of the pills by light. Most common pain killers (or analgesics) such as aspirin, work by preventing the formation of a pain signal within the nerves leading to the brain. Some analgesics, such as codeine, work by blocking the pain signal in the brain. Pain killers are taken to provide short-term relief from headaches, minor cuts and bruises, and rheumatic pain. Severe prolonged pain may be a sign of a more serious disorder, and medical advice should be sought.
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