Histamine is a chemical compound that is produced naturally by the immune system. It is responsible for a wide range of biological activities, including inflammation, allergic reactions, and the regulation of gastric acid secretion. There are several synonyms for histamine, including beta-imidazolylethylamine, 2-(4-Imidazolyl)ethylamine, and 2-(1H-Imidazol-4-yl)ethylamine. Some other related compounds that share similar properties with histamine include serotonin, dopamine, and norepinephrine. These compounds are all neurotransmitters and modulate various physiological processes in the body. Understanding the synonyms for histamine and its related compounds can be useful in medical research and drug development.