
Tramadol (INN) (IPA:
[ˈtræmədɒl]) is an atypical opioid which is a centrally acting analgesic, used for treating moderate to severe pain. It is a synthetic agent, unrelated to other opioids, and appears to have actions on the GABAergic, noradrenergic and

serotonergic systems. Tramadol was developed by the German pharmaceutical company Grünenthal GmbH and marketed under the trade name
Tramal. Grünenthal has also cross licensed the drug to many other pharmaceutical companies that market it under various names, some of which are listed below.
Tramadol is usually marketed as the hydrochloride salt (tramadol hydrochloride) and is available in both injectable (intravenous and/or intramuscular) and oral preparations (e.g.Zydol® in UK and Ultram® in US). It is also available in conjunction with paracetamol (acetaminophen) as Ultracet®.
Dosages vary depending on the degree of pain experienced by the patient. Tramadol is approximately 10% as potent as morphine, when given by the IV/IM route. Oral doses range from 50–400 mg daily, with up to 600 mg daily when given IV/IM.
Mechanism of action
The mode of action of tramadol has yet to be fully elucidated, but it is believed to work through modulation of the GABAergic, noradrenergic and serotonergic systems. The contribution of non-opioid activity is demonstrated by the analgesic effects of tramadol not being fully antagonised by the μ-opioid receptor antagonist naloxone.
Tramadol is marketed as a racemic mixture with a weak affinity for the μ-opioid receptor (approximately 1/6000th that of morphine). The (+)-enantiomer is approximately four times more potent than the (-)-enantiomer in terms of μ-opioid receptor affinity and 5-HT reuptake, whereas the (-)-enantiomer is responsible for noradrenaline reuptake effects (Shipton, 2000). These actions appear to produce a synergistic analgesic effect, with (+)-tramadol exhibiting 10-fold higher analgesic activity than (-)-tramadol (Goeringer et al., 1997).
The serotonergic modulating properties of tramadol mean that it has the potential to interact with other serotonergic agents. There is an increased risk of serotonin syndrome when tramadol is taken in combination with serotonin reuptake inhibitors (e.g. SSRIs), since these agents not only potentiate the effect of 5-HT but also inhibit tramadol's metabolism.
It is suggested that tramadol could be effective for alleviating symptoms of depression and anxiety because of its action on GABAergic, noradrenergic and serotonergic systems. However, use of the drug for treatment of such disorders by a health professional is unlikely.
Tramadol may also be used to treat hypertension when other treatments have failed.
Metabolism
Tramadol undergoes hepatic metabolism via the cytochrome P450 isozyme CYP2D6, being O- and N-demethylated to 5 different metabolites. Of these, M1 is the most significant since it has 200 times the μ-affinity of (+)-tramadol, and furthermore has an elimination half-life of 9 hours compared to 6 hours for tramadol itself. In the 6% of the population who have slow CYP2D6 activity, there is therefore a slightly reduced analgesic effect. Phase II hepatic metabolism renders the metabolites water-soluble and they are renally excreted. Thus reduced doses may be used in renal and hepatic impairment.
Adverse effects
The most commonly reported adverse drug reactions are nausea, vomiting and sweating. Drowsiness is reported, although it is less of an issue compared to other opioids. Respiratory depression, a common side effect of most opioids, is not clinically significant in normal doses. By itself, it does not decrease the seizure threshold, though it may do so if used in combination with SSRIs, tricyclic antidepressants, or in patients with epilepsy. A few seizures have been reported in humans receiving excessive single oral doses (700 mg) or large intravenous doses (300 mg).
Dependence
Some controversy exists regarding the dependence liability of tramadol. Grünenthal has promoted it as an opioid with a low risk of dependence compared to traditional opioids, claiming little evidence of such dependence in clinical trials. They offer the theory that since the M1 metabolite is the principal agonist at μ-opioid receptors, the delayed agonist activity reduces dependence liability. The noradrenaline reuptake effects may also play a role in reducing dependence.
Despite these claims it is apparent, in community practice, that dependence to this agent does occur. This would be expected since analgesic and dependence effects are mediated by the same μ-opioid receptor. However, this dependence liability is considered relatively low by health authorities, such that tramadol is classified as a Schedule 4 Prescription Only Medicine in Australia, rather than as a Schedule 8 Controlled Drug like other opioids (Rossi, 2004). Similarly, tramadol is not currently scheduled by the U.S. DEA, unlike other opioid analgesics. Nevertheless, the Prescribing Information for Ultram warns that tramadol "may induce psychological and physical dependence of the morphine-type."
Recreational use
Tramadol can be used recreationally. Its low affinity for opiate receptors does produce the opiate euphoria that most recreational opioid users desire. In addition to opiate receptor binding it also has some central stimulating qualities which according to some users bares similarities to that of amphetamines. Tramadol can produce nausea and epileptic seizures in supratherapeutic doses, somewhat deterring its abuse. A recent study has concluded that its abuse liability is markedly less than that of traditional opioids (such as hydrocodone, and oxycodone). Tramadol has been known to produce quite severe withdrawal symptoms withabrupt cessation of prolonged use.
Proprietary preparations
Grünenthal, which still owns the patent to tramadol, has cross-licensed the agent to various pharmaceutical companies internationally. Thus tramadol is marketed under many trade names including: Adolonta, Anadol, Calmador, Contramal, Crispin, Lumidol, Mandolgine, Mosepan, Nobligan, Siverol, Tiparol, Toplagic, Tradol, Tradolan, Tralgit, Tramacet, Tramacip, Tramadin, Tramal, Tramahexal, Tramazac, Tramedo, Ultracet, Ultram, Zamadol and Zydol.
Often used to treat
Moderate pain
Severe pain
Most types of Neuralgia, including Trigeminal Neuralgia.[citation needed]
Post operative pain in canines.
Trivia
Rapper Russell Jones (a.k.a. Ol' Dirty Bastard) died from an overdose of a combination of cocaine and tramadol on November 13, 2004.
Reference
Goeringer K, Logan B, Christian G. "Identification of tramadol and its metabolites in blood from drug-related deaths and drug-impaired drivers.". J Anal Toxicol 21 (7): 529-37. PMID 9399121.
(2004) Ed. Rossi S: Australian Medicines Handbook. Adelaide: Australian Medicines Handbook. ISBN 0-9578521-4-2.
Shipton E (2000). "Tramadol--present and future.". Anaesth Intensive Care 28 (4): 363-74. PMID 10969362.
Ultram (PDF). Ortho-McNeil. – U.S. Prescribing Information
McDiarmid T, Mackler L, Schneider D (January 2005). "Clinical inquiries. What is the addiction risk associated with tramadol?". J Fam Pract 54 (1): 72-3. PMID 15623411.
Tramadol Opioids (HTML). Ortho-McNeil. – U.S. Prescribing Information
McDiarmid T, Mackler L, Schneider D (January 2005). "Clinical inquiries. What is the addiction risk associated with tramadol?". J Fam Pract 54 (1): 72-3. PMID 15623411.
Tramadol in the news:
Critics called on Ofcom to investigate after both 'n****r' and 'p**i' were used during his show Tramadol Nights on Tuesday.
L’Oreal and Nestle are appalled by the comic’s sick jokes on Tramadol Nights.
Channel 4 has been condemned for broadcasting "deeply offensive" language after comedian Frankie Boyle used the words "nigger" and "Paki". Boyle said the words in an episode of his Tramadol Nights series shown on Tuesday.
Broadcaster hits back after Commons committee chair attacks comedian's jibes about war in Afghanistan as 'deeply offensive' WARNING: this story contains language which readers may find offensive Channel 4 came out fighting this morning over calls to sack the controversial comedian Frankie Boyle after he used racial language in jokes about the war in Afghanistan. The Tuesday night episode of ...
Channel 4 is under fire for broadcasting "deeply offensive" racial language on comedian Frankie Boyle's TV show.
Frankie Boyle comes under fire again for jokes made on his Channel 4 show Tramadol Nights .
Frankie Boyle has faced a wave of criticism as his controversial style was condemned by a prominent MP and mental health and disability campaigners. Complaints have now been lodged with broadcasting watchdog Ofcom over three different parts of the comedian's Channel 4 series Tramadol Nights.
Channel 4 has been condemned for broadcasting 'deeply offensive' language after comedian Frankie Boyle used the words 'nigger' and 'Paki'.
Channel 4 has been condemned for broadcasting "deeply offensive" language used by comedian Frankie Boyle.
Adults only comedy. The fifth show from the Glaswegian comic blending acerbic, razor-sharp stand up with unique, hilarious sketches crafted in the darkest recesses of the human psyche.
From Wikipedia, the free encyclopedia