Opium/ˈəʊpiəm/ Definition 1 of 2Pro Tip 1/3Medicinal Use Opium is prescribed legally by doctors for pain relief. After the surgery, opium was used to manage the patient's pain. Pro Tip 2/3Illegal Recreation Opium can be used illegally for recreational purposes. Opium dens were notorious places for illegal drug use in the past. Pro Tip 3/3Addiction Risk Using opium may lead to a high risk of addiction. He struggled with opium addiction for many years.