|Biological half-life||7-9 hours|
|Molecular mass||370.441 g/mol|
Samidorphan (ALKS-33) is a selective opioid antagonist which blocks the μ-opioid receptor, but without blocking δ-opioid or κ-opioid receptors. It has been investigated for the treatment of alcoholism and cocaine addiction, showing similar efficacy to naltrexone but possibly with reduced side effects.
However, it has attracted much more attention as part of the combination product ALKS-5461, where samidorphan is combined with the mixed μ-opioid agonist and κ-opioid antagonist opioid modulator buprenorphine, as an antidepressant. Buprenorphine has shown antidepressant effects in some human studies, thought to be because of its antagonist effects at the κ-opioid receptor, but has not been further developed for this application because of its μ-opioid agonist effects and consequent abuse potential. By combining buprenorphine with samidorphan to block the μ-opioid agonist effects, the combination acts more like a selective κ-opioid antagonist, and produces only antidepressant effects, without typical μ-opioid effects being evident.
- Single- and multiple-dose pharmacokinetics of samidorphan, a novel opioid antagonist, in healthy volunteers Clin Ther. 2015 Feb 1;37(2):338-48. doi: 10.1016/j.clinthera.2014.10.001. Epub 2014 Oct 29.
- Hillemacher, T.; Heberlein, A.; Muschler, M. A.; Bleich, S.; Frieling, H. (2011). "Opioid modulators for alcohol dependence". Expert Opinion on Investigational Drugs 20 (8): 1073–1086. doi:10.1517/13543784.2011.592139. PMID 21651459.
- ALK33BUP-101: Safety and Pharmacodynamic Effects of ALKS 33-BUP Administered Alone and When Co-administered With Cocaine
- ALKS 5461 drug found to reduce depressive symptoms in Phase 1/2 study
- Investigational ALKS 5461 Channels ‘Opium Cure’ for Depression
- "Will Alkermes' Antipsychotic ALKS-3831 Become Another Tredaptive?". Forbes. Jan 15, 2013.
- "A Study of ALKS 3831 in Subjects With Schizophrenia and Alcohol Use Disorder".
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