Articles: narcotic-antagonists.
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The United States continues to face a public health emergency of opioid-related harm, the effects of which could be dramatically reduced through increased access to the opioid antagonist naloxone. Unfortunately, naloxone is too often unavailable when and where it is most needed, partly due to its continued status as a prescription medication. Although states and the federal Food and Drug Administration (FDA) have acted to increase access to naloxone, these changes are insufficient to address this unprecedented crisis. In this Commentary, we argue that FDA can and should immediately reclassify naloxone from prescription-only to over-the-counter status, a change that could save hundreds if not thousands of lives in the United States every year.
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J Neurosurg Anesthesiol · Jan 2020
Randomized Controlled TrialThe Effect of Ultra-low-dose Intrathecal Naloxone on Pain Intensity After Lumbar Laminectomy With Spinal Fusion: A Randomized Controlled Trial.
Despite advances in pain management, several patients continue to experience severe acute pain after lumbar spine surgery. The aim of this study was to assess the safety and effectiveness of single ultra-low-dose intrathecal (IT) naloxone in combination with IT morphine for reducing pain intensity, pruritus, nausea, and vomiting in patients undergoing lumbar laminectomy with spinal fusion. ⋯ The addition of ultra-low-dose IT naloxone to IT morphine provides excellent postoperative pain management and effectively controls pruritus and nausea in patients undergoing laminectomy with spinal fusion.
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The mainstay of the management of opioid use disorder in pregnancy is with methadone or buprenorphine medication-assisted treatment. Methadone and buprenorphine are opioid agonist drugs. Naltrexone, an opioid antagonist, is also a medication-assisted treatment option; however, to date, only a few retrospective studies have reported its use in pregnancy. ⋯ These study data demonstrate that, in pregnant women who choose to completely detoxify off opioid drugs during gestation, naltrexone, as a continued form of medication-assisted treatment, is a viable option for some pregnant patients who experience opioid use disorder. Naltrexone crosses the placenta, and maternal and fetal levels are concordant. Because naltrexone clears quickly from the maternal circulation, this rapid clearance needs to be addressed with patients. This is important because maternal relapse could occur in a short time-period if the oral drug is discontinued without the knowledge of their healthcare providers. Nonetheless, the drug is well-tolerated by both mother and fetus, and newborn infants do not experience symptoms of neonatal abstinence syndrome if naltrexone medication-assisted treatment is maintained to delivery.
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Peripherally acting μ-opioid receptor antagonists (PAMORAs) constitute a class of drugs which reverse opioid-induced constipation (OIC) with similar opioid analgesic effects. OIC differs from other forms of constipation in that it is an iatrogenic condition that occurs when an opioid acts on the dense network of μ-opioid receptors in the enteric system, which affect a variety of functions including gastrointestinal motility, secretion, and other factors that can cause bowel dysfunction. Unfortunately, laxative products, bowel regimens, dietary changes, and lifestyle modifications have limited effectiveness in preventing OIC, Opioid-associated adverse effect which occurs in 40% to 80% of opioid patients and may led to cessation of the treatment. ⋯ The three main PAMORAS are methyltrexone (oral or parenteral), naldemedine (oral only), and naloxegol (oral only). Clinical studies demonstrate the safety and efficacy of these agents for alleviating constipation without diminishing the analgesic effect of opioid therapy. The aim of this narrative review to update the current status of PAMORAs for treating OIC in terms of safety and efficacy.
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Anesthesia and analgesia · Jan 2020
Incisional Injury Modulates Morphine Reward and Morphine-Primed Reinstatement: A Role of Kappa Opioid Receptor Activation.
Persistent use of prescription opioids beyond the period of surgical recovery is a large part of a public health problem linked to the current opioid crisis in the United States. However, few studies have been conducted to examine whether morphine reward is influenced by acute pain and injury. ⋯ These findings suggest enhancement of morphine reward as a result of incisional injury but paradoxically a protective adaptation with incisional injury from drug-induced relapse resulting from kappa opioid receptor activation in the reward circuitry. Remote injury conferred no such protection and appeared to enhance reinstatement.