Description:eview. 26. Table 2.2. P lacebo-co ntro lled studies of cytisine (Tab ex®). First author, Publication year. N Cytisine gro u p. N Placeb o gro u p. Treatm ent duratio n. Other sup p ort alkaloids (aconitum alkaloids, solanaceous tropane alkaloids, sophora alkaloids, strychnos alkaloids and colchic