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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.
A drug may be classified by the chemical type of the active ingredient or by the way it is used to treat a particular condition. Each drug can be classified into one or more drug classes. Narcotic analgesics are drugs that relieve pain, can cause numbness and induce a state of unconsciousness. They work by binding to opioid receptors, which are present in the central and peripheral nervous system.