Ergotamine is classified as which type of toxin?

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Ergotamine is an alkaloid, a nitrogen-containing heterocyclic compound produced by a fungus. This class includes many biologically active small molecules derived from amino acids and often affecting nerve or receptor function. Because ergotamine is a nitrogenous, ring-structured organic compound rather than a protein, lipid, or nucleic acid, it fits the alkaloid category. Its effects stem from receptor interactions (serotonin, dopamine, and adrenergic receptors) and vasoconstriction, rather than from being a protein, a lipid, or a nucleic acid toxin.