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Sedatives and Hypnotics Drugs: Miscellaneous Agents01:17

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Sedatives and hypnotics encompass a wide range of substances, each with its unique mechanism of action, uses, and potential adverse effects.
Melatonin congeners like ramelteon (Rozerem) and tasimelteon (Hetlioz) selectively bind to melatonin receptors (MT1 and MT2) and thus mimic the actions of melatonin, a hormone that regulates sleep-wake cycles. Tasimelteon is primarily used for non-24-hour sleep-wake disorder, common in blind patients. They are also used to treat conditions like insomnia...
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Sedatives and hypnotics encompass a drug class that acts on the central nervous system (CNS) to alleviate anxiety, promote relaxation and induce sleep.These drugs function by amplifying the actions of the neurotransmitter γ-aminobutyric acid (GABA), resulting in reduced neuronal activity. Barbiturates, a subset of sedatives and hypnotics first synthesized in the late 1800s, are categorized into ultra-short, short, intermediate, and long-acting groups based on their duration of effect. A...
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Intravenous anesthetics are drugs administered parenterally to induce anesthesia or sedation. Propofol is a widely used agent formulated as a 1% emulsion in soybean oil, glycerol, and egg phosphatide. It induces rapid anesthesia primarily due to its rapid distribution from the bloodstream to target tissues and is metabolized in the liver. However, it can cause significant pain on injection and hypertriglyceridemia. Fospropofol, a water-based prodrug of propofol, lacks these adverse effects.
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Benzodiazepines have both sedative and hypnotic properties. They include compounds such as diazepam (Valium) and alprazolam (Xanax). Structurally, their cores are similar, consisting of the fusion of a benzene ring and a diazepine ring, but they share a common mechanism of action in the central nervous system (CNS).
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CNS depressants include drugs from the category of barbiturates and benzodiazepines. They are valuable medications for managing anxiety disorders and insomnia. Barbiturates, once used to induce and maintain sleep, have been replaced mainly by benzodiazepines due to barbiturate's toxicity, tolerance, and overdose risks. They interact with GABAA receptors, leading to sedation at low doses and potentially coma and death at higher doses. Phenobarbital, a long-acting barbiturate, possesses...
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Sedatives are drugs that alleviate anxiety, while hypnotics induce sleep. Both classes of medication suppress neuronal activity, leading to a calming effect for sedatives and facilitating sleep for hypnotics.
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Illicit fentanyl is increasingly mixed with xylazine, a veterinary drug. Naloxone does not reverse xylazine overdose, which can cause respiratory issues and severe skin ulcers.

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Area of Science:

  • Veterinary pharmacology
  • Toxicology
  • Public health

Background:

  • Illicit drug supplies are increasingly adulterated with xylazine, a veterinary tranquilizer not approved for human use.
  • Xylazine co-use with opioids presents unique clinical challenges, including respiratory depression that is unresponsive to naloxone.
  • Exposure to xylazine can lead to severe, necrotic skin ulcerations.

Purpose of the Study:

  • To highlight the emerging public health threat of xylazine adulteration in illicit drug supplies.
  • To inform healthcare professionals, particularly nurses, about the distinct clinical presentation and management of xylazine exposure.
  • To emphasize the importance of identifying xylazine as a potential cause of overdose and severe skin conditions.

Main Methods:

  • Literature review of xylazine's pharmacological and toxicological properties.
  • Analysis of clinical case reports and public health advisories regarding xylazine.
  • Synthesis of information on differential diagnosis and patient management.

Main Results:

  • Xylazine is a potent alpha-2 adrenergic agonist with sedative and analgesic effects.
  • Unlike opioids, xylazine does not bind to opioid receptors, rendering naloxone ineffective for overdose reversal.
  • Xylazine exposure is associated with significant morbidity, including respiratory depression and severe necrotic skin lesions.

Conclusions:

  • Healthcare providers must consider xylazine in patients presenting with respiratory depression and skin ulcerations, especially when opioid overdose is suspected but unresponsive to naloxone.
  • Early recognition and identification of xylazine abuse are critical for appropriate patient care and harm reduction strategies.
  • Public health initiatives are needed to address the growing crisis of xylazine-adulterated drugs.