
Tramadol (marketed as the hydrochloride salt by Janssen Pharmaceutica as Ultram, and as generics) is used to treat moderate to moderately severe pain. It has two different mechanisms. First, it binds to the μ-opioid receptor. Second, it inhibits the reuptake of serotonin and norepinephrine. Tramadol is a centrally acting atypical opioid analgesic...
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http://en.wikipedia.org/wiki/Tramadol

<chemical> A narcotic analgesic proposed for severe pain. It may be habituating. ... Pharmacological action: analgesics, opioid, narcotics. ... Chemical name: Cyclohexanol, 2-((dimethylamino)methyl)-1-(3-methoxyphenyl)-, cis-(+-)- ... (12 Dec 1998) ...
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http://www.encyclo.co.uk/local/20973

(tram´ә-dol″) an opioid analgesic used as the hydrochloride salt for treatment of pain following surgical procedures and oral surgery; administered orally.
Found on
http://www.encyclo.co.uk/local/21001

Type: Term Pronunciation: trah′mă-dol Definitions: 1. An analgesic drug with a mechanism of action that is unusual in that one optic isomer exerts typical opioid-type effects and the other isomer interacts with the reuptake and/or release of norepinephrine and serotonin in nerve terminals.
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http://www.medilexicon.com/medicaldictionary.php?t=93166
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