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Analgesics are drugs designed specifically to relieve pain. There are several types of analgesics: acetaminophen (Tylenol), which is available without a prescription, and a variety of opioid analgesics, which are available only with a prescription.
nonsteroidal antiinflammatory analgesic (NSAIA) see under drug. opioid analgesic any of a class of compounds that bind with the opioid receptors in the central nervous system to block the perception of pain or affect the emotional response to pain, including opium and its derivatives.onsteroidal antiinflammatory analgesic (NSAIA) see under drug. opioid analgesic any of a class of compounds that bind with the opioid receptors in the central nervous system to block the perception of pain or affect the emotional response to pain, including opium and its derivatives.