Opioid Agonist

2 cited sources

Definition

Any agent that binds to and activates any of the opioid receptor subtypes. Opioid receptor agonists mimic the actions of endogenous opioid peptides.

No specialty is linked to this class yet. That link is what makes browsing from a branch down to a drug possible.

RxClass (NLM)US public domain
NCI Thesaurus (via NCI Metathesaurus C1883695)NCI Thesaurus. NCI's own archived Terms of Use, still served at evs.nci.nih.gov, state: "Permission is hereby granted in perpetuity, without payment of license fees or royalties, to use, copy, or distribute the NCI THESAURUS(TM) ontology, NCI THESAURUS(TM) Users' Guide, and the NCI THESAURUS(TM) database for any commercial or non-commercial purpose". The OBO Foundry registry records the current NCIt licence as CC BY 4.0. NCI's live licence URL https://evs.nci.nih.gov/license redirected to the EVS home page when checked 2026-09-16, so no first-party CURRENT licence text could be captured.