Muscarine is a natural compound found in certain mushrooms, particularly in the Amanita muscaria species, commonly known as the fly agaric. It is classified as a toxic alkaloid and acts as a potent agonist for the muscarinic acetylcholine receptors in the body, which are involved in various physiological functions. When ingested, muscarine can lead to symptoms such as sweating, salivation, and gastrointestinal distress. It is important to note that muscarine is not the same as mushroom poisoning caused by other toxic compounds found in some mushrooms. Proper identification and caution are essential when foraging for wild mushrooms.