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        | http://www.opioids.com/buprenorphine/buprenorphine.jpg |  | Definition 
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        | http://www.usc.es/congresos/ecsoc/9/BOCNP/c013/knesl_1.GIF |  | Definition 
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        | http://www.opioids.com/codeine/codeine.jpg |  | Definition 
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        | http://www.opioids.com/heroin/heroin.jpg |  | Definition 
 
        | diacetylmorphine (heroine) |  | 
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        | http://www.opioids.com/fentanyl/fentanyl.jpg |  | Definition 
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        | http://www.opioids.com/hydrocodone/hydrocodone.jpg |  | Definition 
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        | http://www.opioids.com/hydromorphone/hydromorphone.jpg |  | Definition 
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        | http://www.scielo.cl/fbpe/img/jcchems/v53n4/fig07-01.jpg |  | Definition 
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        | http://www.opioids.com/levorphanol/levorphanol.jpg |  | Definition 
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        | http://www.medicineonline.com/data/drugs/20071109_72A7AE47-CDF3-4949-B9F8-F29B153F787F/loperamide-image01.jpg |  | Definition 
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        | meperidine 
 a 4-phenylpiperidine
 short DOA
 is terminated by cleavage of the ester (required for activity)
 less potent than morphine
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        | http://upload.wikimedia.org/wikipedia/en/thumb/e/e1/Methylnaltrexone.png/202px-Methylnaltrexone.png |  | Definition 
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        | http://www.opioids.com/morphine/morphine.jpg |  | Definition 
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        | http://z.about.com/d/chemistry/1/0/7/Y/morphinan.gif |  | Definition 
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        | http://opioids.com/naloxone/naloxone.jpg |  | Definition 
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        | http://www.opioids.com/naltrexone/naltrexone.jpg |  | Definition 
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        | http://upload.wikimedia.org/wikipedia/commons/d/df/Naltrindole.png |  | Definition 
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        | http://www.medicinescomplete.com/mc/clarke/2009/images/clk1202c001.gif |  | Definition 
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        | http://www.newdruginfo.com/pharmacopeia/usp28/v28230/uspnf/pub/images/v28230/g-607.gif |  | Definition 
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        | http://www.opioids.com/oxycodone/oxycodone.jpg |  | Definition 
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        | http://www.opioids.com/oxymorphone/oxymorphone.jpg |  | Definition 
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        | http://www.pharm.uu.nl/vak/pdocanal/ondmat/titratie/papaverine.gif |  | Definition 
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        | http://www.behavenet.com/capsules/images/pentazocine.gif |  | Definition 
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        | http://www.behavenet.com/capsules/images/propoxyphene.GIF |  | Definition 
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        | http://www.opioids.com/sufentanil/sufentanil.jpg |  | Definition 
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        | http://www.unodc.org/images/odccp/bulletin/bulletin_1980-01-01_1_page006_img001_large.gif |  | Definition 
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        | http://www.opioids.com/tramadol/tramadol.jpg |  | Definition 
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        | endogenous opioid definition |  | Definition 
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        | Loss of pain without loss of consciousness. |  | 
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        | Pain that is originated in muscle and bone, toothache, headache, arthritic, sprains. |  | 
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        | - Pain that is originated in non-skeletal parts of the body such as gastric pain, intestinal cramps, etc. It is relieved only by opioid analgesics. |  | 
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        | It was used to describe any natural or synthetic agent that was derived from morphine. The discovery of peptides in the brain that had similar pharmacological actions to morphine prompted a change in nomenclature. |  | 
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        | All substances, natural or synthetic, with opioid or morphine-like properties that bind specifically to opioid receptors. |  | 
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