National Cancer Institute Thesaurus

Last uploaded: June 2, 2026
Id http://ncicb.nci.nih.gov/xml/owl/EVS/Thesaurus.owl#C436
http://ncicb.nci.nih.gov/xml/owl/EVS/Thesaurus.owl#C436
Preferred Name

Hydromorphone Hydrochloride

Definitions
The hydrochloride salt form of hydromorphone, the hydrogenated ketone of morphine, a semi-synthetic opioid with analgesic effects. Hydromorphone selectively binds the mu-opioid receptor which is linked through G-proteins. Binding stimulates the exchange of guanosine triphosphate (GTP) for guanosine diphosphate (GDP) on the G-protein complex and interacts with and inhibits adenylate cyclase located at the inner surface of the plasma membrane. This leads to a reduction in intracellular cyclic 3',5'-adenosine monophosphate (cAMP). Further, voltage-gated potassium channels are activated, thereby causing hyperpolarization and reducing neuronal excitability. In addition, the opening of voltage-gated calcium channels is inhibited, thereby leading to an inhibition of calcium entry and a reduction in the release of various neurotransmitters, including GABA, vasopressin, somatostatin, insulin and glucagons.
Synonyms
Dilaudid HP
HYDROMORPHONE HYDROCHLORIDE
Hydromorphone Hydrochloride
Hydromorphone
Dilaudid
Dimorphone
Exalgo
Hydrostat
Hymorphan
Laudicon
Novolauden
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Type http://www.w3.org/2002/07/owl#Class
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