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hydromorphone hydrochloride The hydrochloride salt of the semi-synthetic opioid hydromorphone with analgesic activity. Hydromorphone, the hydrogenated ketone of morphine, selectively binds the mu-opioid receptor, a G protein-coupled receptor. Binding stimulates the exchange of guanosine triphosphate (GTP) for guanosine diphosphate (GDP) on the G-protein complex, resulting in inhibition of plasma membrane-associated adenylate cyclase (AC) and a reduction in intracellular cyclic 3',5'-adenosine monophosphate (cAMP) levels. Due to a reduction in cAMP levels, voltage-gated potassium channels are activated, resulting in neuronal hyperpolarization and a reduction in neuronal excitability. In addition, this agent inhibits the opening of voltage-gated calcium channels, resulting in inhibition of calcium entry into neuronal cells and a reduction in the release of nociceptive neurotransmitters such as substance P and glutamate. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)
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US brand names: | ![](https://webarchive.library.unt.edu/eot2008/20090509165907im_/http://www.cancer.gov/images/spacer.gif) | Dilaudid Dilaudid HP Dimorphone Hydrostat Hymorphan Laudicon Novolauden | | ![](https://webarchive.library.unt.edu/eot2008/20090509165907im_/http://www.cancer.gov/images/spacer.gif) |
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