Correct spelling for the English word "migrainin" is [mˈa͡ɪɡɹe͡ɪnˌɪn], [mˈaɪɡɹeɪnˌɪn], [m_ˈaɪ_ɡ_ɹ_eɪ_n_ˌɪ_n] (IPA phonetic alphabet).
Trade name of antipyrine-caffeine citrate.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.