Medical Definition of PEYOTE. 1. : a hallucinogenic drug containing mescaline that is derived from peyote buttons and used especially in the religious ceremonies of some American Indian peoples.2.edical Definition of PEYOTE. 1. : a hallucinogenic drug containing mescaline that is derived from peyote buttons and used especially in the religious ceremonies of some American Indian peoples. 2.
Ketamine was invented in 1962 as a very effective anesthetic for routine surgery. It is blocks the neurotransmitter molecule glutamate from its NMDA receptor in brain neurons, and affects primarily the memory center in the hippocampal region of the brain, along with the prefrontal cortex abstract thought center.
Histamine is an organic nitrogenous compound involved in local immune responses as well as regulating physiological function in the gut and acting as a neurotransmitter for uterus. Histamine is involved in the inflammatory response and has a central role as a mediator of pruritus. As part of an immune response to foreign pathogens, histamine is produced by basophils and by mast cells found in nearby connective tissues. Histamine increases the permeability of the capillaries to white blood cells and some proteins, to allow them to engage pathogens in the infected tissues.