Gelsemium, yellow jasmine, has as its active principle the alkaloid, gelseminine. The fluidextract, dose, 1 minim (0.06 c.c.), and the 10 per cent. tincture, dose, 10 minims (0.6 c.c.), are official.

Peripherally it acts like conium, but centrally is more depressing. It is somewhat analgesic, and has an atropine action on the pupil and accommodation. Therapeutically, it has been employed with reputed good effects in refractory trifacial neuralgia, but just how it checks the neuralgic pain has not been explained.