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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.
Most, if not all, ailments of the body cause pain. Pain is interpreted and perceived in the brain. Pain is modulated by two primary types of drugs that work on the brain: analgesics and anesthetics. The term analgesic refers to a drug that relieves pain without loss of consciousness.he modulation of pain by electrical brain stimulation results from the activation of descending inhibitory fibers, which modulate (block) the input and output of laminae I, II, V and VII neurons. The route from the PAG to the spinal cord is not direct.