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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...

Therapeutic Drug Monitoring: Affecting Factors

Therapeutic Drug Monitoring: Affecting Factors

Therapeutic Drug Monitoring (TDM) is the clinical practice of measuring specific drug levels in a patient's blood or body tissues to manage and optimize therapy. TDM is crucial for drugs with narrow therapeutic windows, like warfarin and phenytoin, where incorrect doses can lead to treatment failure or severe side effects. This monitoring ensures the dosage administered is within a safe and effective range. The factors affecting therapeutic drug monitoring include:Patient-Specific Factors:a.

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: 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...

Pharmacogenetics of Phase II Enzymes: N-acetyltransferase, Thiopurine S-methyltransferase, UDP-glucuronosyltransferase

Pharmacogenetics of Phase II Enzymes: N-acetyltransferase, Thiopurine S-methyltransferase, UDP-glucuronosyltransferase

Phase II biotransformation reactions are essential for detoxifying and eliminating xenobiotics, including many pharmaceutical compounds. These reactions typically involve conjugation, the covalent attachment of polar endogenous groups such as glucuronic acid, sulfate, methyl, or acetyl moieties to functional groups introduced during Phase I metabolism. The resulting conjugates are more water-soluble, enabling efficient renal or biliary excretion.The major classes of Phase II enzymes include...

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Related Experiment Video

Updated: Jun 23, 2026

Multi-Gene Single Nucleotide Polymorphism Detection in Gastric Cancer Based on Ion Semiconductor Sequencing Platform

Multi-Gene Single Nucleotide Polymorphism Detection in Gastric Cancer Based on Ion Semiconductor Sequencing Platform

Published on: May 10, 2024

[The network of methotrexate toxicity].

Clarinda Neves¹, Rosa Jorge, Anabela Barcelos

¹Interna Complementar de Medicina Interna, Unidade de Reumatologia e Serviço de Medicina 2, Hospital Infante D. Pedro EPE - Aveiro. ccn@netcabo.pt

Acta Reumatologica Portuguesa

|May 20, 2009

Summary

Methotrexate is crucial for rheumatoid arthritis but has varied toxic effects. Monitoring these adverse events, like gastrointestinal issues and myelosuppression, is vital to prevent treatment withdrawal and fatal outcomes.

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Last Updated: Jun 23, 2026

Multi-Gene Single Nucleotide Polymorphism Detection in Gastric Cancer Based on Ion Semiconductor Sequencing Platform

Multi-Gene Single Nucleotide Polymorphism Detection in Gastric Cancer Based on Ion Semiconductor Sequencing Platform

Published on: May 10, 2024

Area of Science:

Rheumatology
Pharmacology

Background:

Methotrexate is a key disease-modifying antirheumatic drug (DMARD) for rheumatoid arthritis.
While effective, methotrexate exhibits a wide range of toxic effects, varying in severity.
Potential side effects range from mild malaise to severe, potentially fatal conditions like pneumonitis or pancytopenia.

Purpose of the Study:

To comprehensively review the adverse effects associated with methotrexate therapy in rheumatoid arthritis patients.

Main Methods:

A literature review was conducted using Medline.
Keywords included "methotrexate", "toxic effects", "adverse effects", and "rheumatoid arthritis".
Relevant articles and their references were analyzed.

Main Results:

Gastrointestinal symptoms are most common; myelosuppression and pneumonitis are most feared.
Hepatotoxicity (elevated transaminases, cirrhosis risk), cutaneous lesions, neurologic symptoms, bone metabolism changes, teratogenicity, and hyperhomocysteinemia are other concerns.
Folate supplementation can prevent folate-dependent symptoms, and pharmacogenomics may identify high-risk patients.

Conclusions:

Careful monitoring and awareness of methotrexate's side effects are essential.
This vigilance helps prevent treatment discontinuation due to toxicity and avoids fatal outcomes.