Correct spelling for the English word "purgen" is [pˈɜːd͡ʒən], [pˈɜːdʒən], [p_ˈɜː_dʒ_ə_n] (IPA phonetic alphabet).
Proprietary name of a preparation of phenolphthalein, employed as a laxative in doses of 1 to 5 grains (0.06 to 0.33).
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.