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Toxidromes are specific patterns of symptoms resulting from toxic substance exposure. They help in the identification and treatment of poisoning. The symptoms of each toxidrome group indicate poisoning by a certain class of chemicals or drugs.1. Sympathomimetic: Stimulates the sympathetic nervous system. Symptoms include agitation, increased heart rate (HR), blood pressure (BP), respiratory rate (RR), temperature, and pupil size. Drugs like cocaine and amphetamines, along with tremors and...
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Adverse Drug Reactions (ADRs) are potential complications that arise during pharmacotherapy, influenced by multiple risk factors. Age plays a significant role; both neonates and the elderly are at heightened risk due to their respective immature and diminished metabolic and elimination processes. Gender also impacts ADRs, with females experiencing a 1.5 to 1.7-fold greater risk than males, which may be linked to pharmacokinetic, pharmacodynamic, and hormonal differences. Notably, neonates, the...
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Drug toxicity quantifies the harm a compound causes to an organism, varying by dose and potentially impacting whole systems or specific organs like the liver. Toxic reactions may arise from venomous insect or spider bites, with effects ranging from mild symptoms to severe outcomes such as brain damage or death. Common forms of acute poisoning include ethanol intoxication and overdose of pain or fever medications, with substances like GHB and heroin being particularly lethal at doses close to...
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Pharmaceutical poisoning can occur through various channels, impacting an estimated 2 million hospitalized patients in the U.S. annually with serious adverse drug responses. These scenarios encompass both therapeutic uses, such as drug toxicity, where even standard dosages can lead to severe central nervous system depression, and non-therapeutic exposures, including accidental ingestion by children, and environmental and occupational exposures.Unintentional poisonings often involve exploratory...
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Idiosyncratic drug reactions represent abnormal chemical responses that vary significantly among individuals, ranging from extreme sensitivity to low doses to insensitivity to high doses. These reactions often occur due to the drug's covalent binding with serum proteins, forming a foreign hapten that triggers an immunotoxicological response. The variability in drug reactions has a strong pharmacogenetic foundation, with genetic differences crucial in how individuals metabolize drugs. For...
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A rare fatality attributed solely to metaxalone.

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This case study highlights metaxalone (Skelaxin) as the sole cause of death in a young individual. Postmortem concentrations reveal significant levels, emphasizing its potential toxicity.

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Area of Science:

  • Forensic Toxicology
  • Pharmacology

Background:

  • Metaxalone (Skelaxin) is a skeletal muscle relaxant with rare associations with fatalities.
  • This study details a case where metaxalone was the primary factor in a death.

Observation:

  • A young decedent had high metaxalone concentrations in postmortem specimens.
  • Antemortem blood concentration was 37.4 mcg/mL.
  • Postmortem concentrations included 13.5 mcg/mL (heart blood), 4.9 mcg/mL (vitreous humor), 69.4 mcg/g (liver), and 74.0 mcg/g (brain).

Findings:

  • Metaxalone was identified as the sole agent contributing to the fatality.
  • A blood-to-plasma ratio of 1.4 was calculated, indicating higher drug levels in whole blood.

Implications:

  • This case underscores the potential lethality of metaxalone, even in younger individuals.
  • The blood-to-plasma ratio is crucial for interpreting metaxalone concentrations against therapeutic ranges.
  • Forensic toxicologists should consider this ratio when analyzing metaxalone levels.