Any chemical that has opiate-like effects; commonly used to refer to endogenous neurochemicals that activate opiate receptors
{s} having characteristics similar to that of opium; caused by an opioid peptide, caused by a substance produced in the body which has effects similar to that of opium
= any compound, peptide or otherwise, which, while not containing the fundamental morphine or thebaine structure, possesses some affinity for any, or all, of the opioid receptor subtypes Common opioids are endorphin, fentanyl and methadone
{i} any substance similar to opium; natural substance produced in the body in response to stress or pain; synthetic drug with effects similar to those of opium
a class of drugs (e g , heroin, codeine, methadone) that are derived from the opium poppy plant, contain opium, or are produced synthetically and have opium-like effects Opioid drugs relieve pain, dull the senses and induce sleep
Preferred to narcotic Refers to codeine, morphine and other natural, semisynthetic and synthetic drugs that relieve pain by binding to multiple types of opioid receptors in the central nervous system