We describe a case of sparteine intoxication associated with using a prepar
ation from lupine seeds. A female patient of Portuguese origin presented to
the emergency department with classic anticholinergic signs after ingestio
n of a lupine seed extract. She took the preparation with the belief it rep
resented a cure for her recently diagnosed diabetes. Analysis of the patien
t's lupine bean extract identified the preponderant compound as oxo-spartei
ne by gas chromatography/mass spectrometry. Intoxication by lupine seeds ra
rely occurs in human beings. To our knowledge, no medical or toxicologic ev
idence supports a belief that lupine extract could lower serum glucose leve
ls. This case highlights the need for emergency care providers to be aware
of the health hazards that can be associated with the use of such home reme
dies.