Morphine
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- See Morphine (band) for the rock band.
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| 7,8-didehydro-4,5-epoxy- 17-methylmorphinan-3,6-diol | |
| CAS number 57-27-2 (anhydrous) | ATC code N02AA01 |
| Chemical formula | C17H19NO3 |
| Molecular weight | 285.4 |
| Bioavailability | ~30%? |
| Metabolism | renal 90%, biliary 10% |
| Elimination half-life | 2-3 hours |
| Excretion | renal |
| Pregnancy category | Category C (Australia) |
| Legal status | Schedule 8 (Australia), Class A (UK), DEA C-II (USA) |
| Routes of administration | oral, SC, IM, IV |
Morphine (INN), the principal active agent in opium, is a powerful opioid analgesic drug. According to recent research, it may also be produced naturally by the human brain.[1] (http://www.pnas.org/cgi/content/abstract/0405430101v1?view=abstract) 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. Morphine is usually highly addictive, and tolerance and physical and psychological dependence develop quickly. Patients on morphine often report insomnia and nightmares.
Morphine is frequently found in various preparations.
Parenterally (i.e. administered in a manner other than through the digestive tract), 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. Morphine is rarely in suppository form.
Morphine is used legally in the following :
- the relief of acute, severe pain
- pain after surgery
- pain associated with trauma
- the relief of moderate to severe chronic pain
- cancer pain
- tooth extraction
- as an adjunct to general anesthesia
- in epidural anesthesia
- relief of pain in palliative care (i.e. to alleviate pain without curing the underlying reason for it)
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 needle (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 (diacetylmorphine) 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.
Morphine is listed as a Class A drug under the 1971 Misuse of Drugs Act in the United Kingdom. Internationally, morphine is a Schedule I drug under the Single Convention on Narcotic Drugs[2] (http://www.incb.org/pdf/e/list/yellow.pdf).
Contraindications
- Acute pancreatitis (this may be a result of morphine use as well)
External links
- Morphine Apparently in Your Head (http://wired.com/news/medtech/0,1286,65053,00.html?tw=wn_tophead_4) - Wired Magazine article about endogenous production of morphine
- Morphine (http://www.emsb.qc.ca/laurenhill/science/morphine.html), Molecule of the Month (http://www.chm.bris.ac.uk/motm/motm.htm).
| Analgesics edit (https://academickids.com:443/encyclopedia/index.php?title=Template:Analgesics&action=edit) | ||
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{Paracetamol (acetaminophen) } {Tetrahydrocannabinol} {Cannabinoids} {Ketamine} | ||
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