Nandan Gupta*, Astha Sharma
An opioid is a medicine that is not generated from opium (a mixture of molecules prepared from a species of poppy, papaver somniferum), but interacts with the opioid receptor. Analgesics, antitussives, and antidiarrheal drugs are all classified as opioids. A number of animal taxa, including ascarids, scallops, fish, reptiles, birds, and mammals, have been found to have opioid receptor systems or opioid effects. Phenanthrenes and benzylisoquinolines are two different chemical classes. Morphine, codeine, and thebaine, as well as other clinically effective opioids, belong to the phenanthrene family. The stereochemical structure of opioids is closely linked to their potency, and in most situations, the levorotatory isomer is the most active isomer.