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see Morphine for the rock band

Morphine (C17H19NO3) is a powerful analgesic narcotic drug found in opium. Like other opiates, morphine acts directly on the central nervous system (CNS) to relieve pain, and at synapses of the arcuate nucleus, in particular. Side effects include impairment of mental performance, euphoria, drowsiness, lethargy, and blurred vision. It also decreases hunger, inhibits the cough reflex, and produces constipation. When not used as a treatment for pain, morphine is usually highly addictive, and tolerance and physical and psychological dependence develop quickly.

Morphine is frequently found in various preparations. Parenterally, it is given as subcutaneous, intravenous or epidural injections. The military sometimes issues morphine loaded in an autoinjector. Orally, it comes as an elixir or in tablet form, though this is rare, as codeine is more effective orally. Morphine is rarely in suppository form.

Morphine is used legally in the following :

It was first isolated in 1803 by the German pharmacist Friedrich Wilhelm Adam Serturner, who named it 'morphium' after Morpheus, the Greek god of dreams. But it was not until the development of the hypodermic syringe (1853) that its use spread. It was used for pain relief and, ironically, as a 'cure' for opium or alcohol addiction. Its extensive use during the American Civil War resulted in over 400,000 sufferers from the 'soldiers disease' (addiction).

Heroin was derived from morphine in 1874. Along with other drugs, its possession without a prescription was criminalised in the US by the Harrison Narcotics Tax Act of 1914.

Listed as a Class A drug under the 1971 Misuse of Drugs Act in the United Kingdom.