By Dr Ananya Mandal, MD. Morphine is the most abundant analgesic opiate found in opium and is a potent pain reliever. The drug is used in clinical pain relief but is also used illicitly for recreational purposes among drug users.ources, street names and brand names of morphine. Morphine is obtained from the seedpod extract or opium found in the poppy plant, Papaver somniferum. Morphine is widely used in clinical pain management, especially for terminal cancer pain and post-surgery pain.