Seneciphylline N-oxide is a pyrrolizidine alkaloid obtained from Emilia sonchifolia and is the dehydrogenation product of Senecionine N-oxide.

Root cultures of Senecio erucifolius (Asteraceae) efficiently took up and incorporated [14C]putrescine and [14C]arginine into the pyrrolizidine alkaloid (PA) senecionine N-oxide. Pulse-chase experiments covering a growth period of 10 to 19 days revealed the absence of any significant alkaloid turnover[1]

Seneciphylline was quickly absorbed into plasma (Tmax , 0.23-0.32 h) and reached the maximum concentration of 0.82-1.75 μg/mL after oral administration. Both seneciphylline and seneciphylline N-oxide were eliminated from plasma quickly. The low system exposure (oral bioavailability, 5.43-10.31%) was related to the extensive metabolism in the liver and microflora.[2]