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Toxic Reactions: Overview

Toxic Reactions: Overview

When toxic substances penetrate the human body, they disseminate to various tissues, undergoing metabolic changes. This process yields reactive metabolites that may covalently bind with specific target molecules, resulting in toxicity.
Toxicity falls into two primary categories: local and systemic.
Local toxicity appears at the exposure site, such as protein denaturation caused by caustic substances.
In contrast, systemic toxicity requires the toxic agent's absorption and distribution,...

Drug Toxicity: Dose-Dependent Reactions

Drug Toxicity: Dose-Dependent Reactions

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...

Drug Toxicity: Overview

Drug Toxicity: Overview

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...

Drug toxicity: Idiosyncratic Reactions

Drug toxicity: Idiosyncratic Reactions

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...

Toxidromes: Clinical Features

Toxidromes: Clinical Features

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...

Drug Toxicity: Risk factors

Drug Toxicity: Risk factors

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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Related Experiment Video

Updated: Jun 25, 2026

High Content Screening Analysis to Evaluate the Toxicological Effects of Harmful and Potentially Harmful Constituents (HPHC)

High Content Screening Analysis to Evaluate the Toxicological Effects of Harmful and Potentially Harmful Constituents (HPHC)

Published on: May 10, 2016

Decoding the Toxicity of Synthetic Cannabinoids: From Receptor Activation to Multiorgan Dysfunction.

Weihao Fan¹, Zhipeng Che¹, Li Xiao¹

¹West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, Sichuan, China.

Medicinal Research Reviews

|June 24, 2026

Summary

Synthetic cannabinoids (SCBs) pose severe health risks due to potent activation of cannabinoid receptors. Understanding SCB toxicity mechanisms is vital for developing targeted therapies and reducing abuse consequences.

Keywords:

cannabinoid receptor pathogenic mechanisms signaling pathway synthetic cannabinoids

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Gap Junctional Intercellular Communication: A Functional Biomarker to Assess Adverse Effects of Toxicants and Toxins, and Health Benefits of Natural Products

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Published on: December 25, 2016

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Last Updated: Jun 25, 2026

High Content Screening Analysis to Evaluate the Toxicological Effects of Harmful and Potentially Harmful Constituents (HPHC)

High Content Screening Analysis to Evaluate the Toxicological Effects of Harmful and Potentially Harmful Constituents (HPHC)

Published on: May 10, 2016

Gap Junctional Intercellular Communication: A Functional Biomarker to Assess Adverse Effects of Toxicants and Toxins, and Health Benefits of Natural Products

Gap Junctional Intercellular Communication: A Functional Biomarker to Assess Adverse Effects of Toxicants and Toxins, and Health Benefits of Natural Products

Published on: December 25, 2016

Area of Science:

Pharmacology
Toxicology
Neuroscience

Background:

Synthetic cannabinoids (SCBs) are novel psychoactive substances designed to mimic cannabis effects.
SCBs exhibit high potency and full agonism at cannabinoid receptors (CB1 and CB2).
Their action leads to severe public health risks and systemic harm.

Purpose of the Study:

To comprehensively review the multifaceted pathogenesis of SCB-induced systemic harm.
To examine clinical evidence and molecular mechanisms linking SCB exposure to adverse outcomes.
To elucidate SCB toxicity mechanisms for targeted therapy development.

Main Methods:

Systematic review of existing literature.
Analysis of clinical evidence and molecular mechanisms.
Examination of downstream effects on neurotransmitter systems, ion channels, and signaling pathways.

Main Results:

SCBs robustly activate CB1 and CB2 receptors, causing profound dysregulation.
This activation leads to widespread cellular dysfunction and damage.
SCB exposure is linked to cardiovascular, neurological, psychiatric, respiratory, digestive, and kidney toxicities.

Conclusions:

Elucidating SCB toxicity mechanisms is crucial for effective treatment strategies.
Knowledge of pathogenesis is key to mitigating severe health consequences of SCB abuse.
Targeted therapies can be developed based on a comprehensive understanding of SCB-induced harm.