As nouns the difference between morphine and antianalgesia

is that morphine is a crystalline alkaloid (7,8-didehydro-4,5-epoxy-17-methyl-morphinan-3,6-diol), extracted from opium, the salts of which are soluble in water and are used as analgesics, anaesthetics and sedatives; it is one of a group of morphine alkaloids while antianalgesia is (biochemistry) the ability of certain endogenous chemicals (notably cholecystokinin and neuropeptide y) to counter the effects of exogenous analgesics (such as morphine) or endogenous pain-inhibiting neurotransmitters and modulators.