Patent ID: 8361524

Claim:
A method of treating drug addiction, comprising the steps of: pulverizing Radix Stephaniae Epigaeae to powder as a starting material, adding 35-100% ethanol at 4-10 times the amount of the starting material by weight, extracting by reflux extraction from one to four times, 1-3 hours each time, filtering the extract, combining the filtrates of ethanol extract, recovering ethanol from the filtrates, concentrating the recovered ethanol to obtain a thick extract with relative density of 1.18-1.30 at 80° C.; acidifying said thick extract with 3-18% HCl solution until the pH value is 1-4, filtering the acidified thick extract, basifying the filtrate with 8-20% NaOH solution until the pH value is 8-11, allowing the basified filtrate to stand, collecting a precipitate of the basified filtrate, washing the precipitate with water, drying the precipitate in order to obtain an extract of Radix Stephaniae Epigaeae, and administering an effective amount of a medicine comprising the extract of Radix Stephaniae Epigaeae to a patient in need thereof.