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Ultra-Low-Dose Naltrexone Decreases Dependence and Addictive Properties of Opioids

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Opiate Receptors and Antagonists

Part of the book series: Contemporary Neuroscience ((CNEURO))

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Abstract

Ultra-low-dose opioid antagonist cotreatment was first shown parad oxically to enhance opioid analgesia and to reduce analgesic tolerance and physical dependence. In this chapter, we review data demonstrating that ultra-low-dose naloxone or naltrexone reduces several components of opioid dependence and addiction. While the reduction in opioid dependence, first demonstrated as a reduction in somatic withdrawal signs, might seem merely a correlate of the attenuation in tolerance, the data reviewed here show that ultra-low-dose naltrexone also reduces the “psychological” or negative affective aspect of acute opioid withdrawal. In addition, the acute rewarding properties of opioids are reduced by ultra-low-dose naltrexone. The attenuation of rewarding effects occurs in the same ultra-low dose ranges shown to enhance analgesia, thus dissociating the rewarding or addictive effects of opioids from their analgesic properties. Furthermore, in intravenous self-administration procedures in rats, ultra-low-dose opioid antagonists coadmin-istered with opioids reduced their rewarding potency, reduced motivation to obtain the drug, and reduced “drug-seeking” in the absence of drug availability. Finally, in a Phase III clinical trial, the ultra-low-dose naltrexone component of Oxytrex™ significantly reduced physical signs of opioid dependence after abrupt cessation of treatment, compared to withdrawal from oxycodone alone. Together, the data reviewed in this chapter suggest a reduced potential for opioid dependence and addiction by certain ultra-low-dose opioid antagonists combined with opioids, concurrent with the enhanced analgesia from these opioid agonist/antagonist cotreatments.

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Burns, L.H., Leri, F., Olmstead, M.C. (2009). Ultra-Low-Dose Naltrexone Decreases Dependence and Addictive Properties of Opioids. In: Dean, R.L., Bilsky, E.J., Negus, S.S. (eds) Opiate Receptors and Antagonists. Contemporary Neuroscience. Humana Press. https://doi.org/10.1007/978-1-59745-197-0_13

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