Senecionine is a pyrrolizidine alkaloid isolated from the plant species of the genus Senecio. It has a role as a plant metabolite. It is a lactone, a tertiary alcohol and a pyrrolizidine alkaloid. It is functionally related to a senecionan. It is a conjugate base of a senecionine(1+). Senecionine (SEN) is a representative of the hepatotoxic pyrrolizidine alkaloids.