Morphine ( INN ) (pronounced /?m?rfi?n/ ) is a highly potent opiate analgesic drug , is the principal active agent in opium , and is considered to be the prototypical opioid . Morphine was in 1803 the first alkaloid isolated from a plant source [ citation needed ] . 更多

Morphine ( INN ) (pronounced /?m?rfi?n/ ) is a highly potent opiate analgesic drug , is the principal active agent in opium , and is considered to be the prototypical opioid . Morphine was in 1803 the first alkaloid isolated from a plant source [ citation needed ] . Like other opioids, e.g. oxycodone , hydromorphone , and diacetylmorphine ( heroin ), morphine acts directly on the central nervous system (CNS) to relieve pain, particularly at the synapses of the nucleus accumbens . Morphine has a high potential for addiction ; tolerance and both physical and psychological dependence develop rapidly. less