The present invention provides a plant-based medicament for treatment for opiate addiction having reduction ability on addiction liability of opiate narcotics. The medicament according to the invention is safe, non-addictive, has reduction ability on withdrawal symptoms (especially, drug craving, irritability, paresthesia including formication, etc.), that is capable of reducing drug craving, rehabilitating and treating prolonged narcotic dependence, and especially, is inexpensive and easy to implement, particularly on large scale.