Corydine is a naturally occurring compound which can be extracted from plants such as Chelidonium majus, Corydalis marschalliana, C. bulbosa, C slivenensis, Glaucium grandiflorum. Corydine has shown some efficacy as an anti-cancer compound in several cell models and was examined along with related compounds from Stephania dinklagei for antiprotozoal activities. (+)- and (-)- Corydine were tested as neuromuscular blocking agents were it was found that there was a modest preference for (+)-corydine.