Correct spelling for the English word "nasrol" is [nˈasɹɒl], [nˈasɹɒl], [n_ˈa_s_ɹ_ɒ_l] (IPA phonetic alphabet).
Trade name of a salt, usually the sodium salt, of caffeine-sulphonic acid; diuretic in doses of gr. 10-15 (0.6-1.0); called also symphorol.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.