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Drug Toxicity: Dose-Dependent Reactions01:24

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Drug toxicities can be stratified into pharmacological, pathological, or genotoxic based on their mechanisms. The incidence and severity of these toxicities generally increase with the drug's concentration in the body and exposure time.Pharmacological toxicity is evident when the therapeutic effects of drugs overshoot into adverse reactions in a predictable, dose-dependent manner. Central nervous system (CNS) depression from barbiturates is a classic example, with effects escalating from...
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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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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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Treatment strategies for poisoning are a critical aspect of emergency medicine, focusing on preventing the absorption of toxins and enhancing their elimination. When a poisoning incident occurs, the first response is to halt exposure and decontaminate the patient, particularly through gastrointestinal (GI) methods if the poison was ingested.Gastrointestinal Decontamination Techniques:Activated charcoal is the cornerstone of GI decontamination. It works through adsorption, binding the toxin to...
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Phase II Reactions: Methylation Reactions01:17

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Methylation is a phase II biotransformation process involving the attachment of a methyl group to a substrate. Enzymes known as methyltransferases orchestrate this reaction.
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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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Fatal oral methylphenidate intoxication with postmortem concentrations.

Frank Lee Cantrell1, Patricia Ogera, Phyllis Mallett

  • 1California Poison Control System, San Diego Division, 200 West Arbor Drive, San Diego, 92103-8925, CA; Department of Clinical Pharmacy, University of California San Francisco, 521 Parnassus Avenue, San Francisco, 94117, CA.

Journal of Forensic Sciences
|February 8, 2014
PubMed
Summary
This summary is machine-generated.

This study reports the first documented fatality solely from methylphenidate (MPD) ingestion. Analysis confirmed elevated MPD levels, suggesting a potential risk even in isolated cases.

Keywords:
forensic scienceforensic toxicologyingestionmethylphenidateoral

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Area of Science:

  • Forensic Toxicology
  • Pharmacology

Background:

  • Methylphenidate (MPD) is a common stimulant prescribed for attention-deficit/hyperactivity disorder (ADHD).
  • While MPD overdose attempts are known, fatalities exclusively due to MPD have not been previously documented.

Observation:

  • A 62-year-old woman was discovered deceased with a significant quantity of missing MPD tablets (>300 x 10 mg).
  • Gas chromatography-mass spectrometry detected elevated MPD concentrations in postmortem peripheral and central blood, liver, and vitreous humor.

Findings:

  • Postmortem redistribution analysis indicated MPD does not undergo significant redistribution (central/peripheral blood ratio: 0.89; liver/peripheral blood ratio: 3.3).
  • No other cause of death was identified.

Implications:

  • This case represents the first reported fatality attributed solely to isolated methylphenidate ingestion.
  • Highlights the potential for lethal outcomes with high-dose MPD consumption, even without other contributing factors.