Toxicity in human 

"One to ten milligrams per kilogram body weight are said to be deadly to humans."

Ludewig; Regenthal et al. (2007) do list 1.5 - 6 mg aconitine nitrate per os as the lethal dose for a man. This is coherent with figures of other authors, including the classical work of Louis Lewin, Gifte und Vergiftungen (1928), which is considered by many toxicologists as one of the fundamental works of modern toxicology. I myself was teached in lectures, that aconitine is the deadliest alcaloid found in european plants, with dosis leth. singula in order of 5 - 10 mg p.o. I'll change therefore the figure given in the article.84.163.126.131