Correct spelling for the English word "sedatin" is [sˈɛdɐtˌɪn], [sˈɛdɐtˌɪn], [s_ˈɛ_d_ɐ_t_ˌɪ_n] (IPA phonetic alphabet).
Valerydin, valerylphenetidin, occurring in tasteless, odorless crystals; employed as a sedative in nervous affections in doses of gr. 8-15 (0.5-1.0).
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.