β-Naltrexamine, or 6β-naltrexamine, is an opioid receptor antagonist related to naltrexol and naltrexone.

[1][2][3] It has served as a parent pharmacophore for irreversible antagonists of the μ-opioid receptor (MOR) such as β-chlornaltrexamine (β-CNA) and β-funaltrexamine (β-FNA).

[1][2] Naltrexamine itself is a neutral antagonist of the MOR and the δ-opioid receptor (DOR) with similarly high affinity for both receptors.

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