Morphine, sold under many trade names, is a pain medication of the opiate type. It acts directly on the central nervous system (CNS) to decrease the feeling of pain. It can be used for both acute pain and chronic pain. Morphine is also frequently used for pain from myocardial infarction and during labour.It can be administered orally, intramuscularly, subcutaneously, intravenously, into the space around the spinal cord, or rectally.he primary source of morphine is isolation from poppy straw of the opium poppy. In 2013 an estimated 523,000 kilograms of morphine were produced. About 45,000 kilograms were used directly for pain, an increase over the last twenty years of four times.