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Related Concept Videos

Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

Drug-related allergies are immune-mediated responses triggered by the administration of pharmacological agents. These hypersensitivity reactions are classified based on the immune mechanisms involved. The four primary types—Type I, II, III, and IV—are mediated by different immunological pathways and exhibit distinct clinical manifestations.Type I Hypersensitivity/ IgE-Mediated Reactions: Immunoglobulin E (IgE) immediately mediates Type I hypersensitivity reactions. Upon initial exposure to a...
Drug Excretion: Miscellaneous Routes01:10

Drug Excretion: Miscellaneous Routes

Drug excretion involves various organs, including the liver, intestines, skin, and eyes. In the case of drugs or toxins, they can be actively secreted into bile by transporters in the hepatocyte's canalicular membrane. These substances enter the GI tract during digestion and may be reabsorbed into the body from the intestine. This process, known as enterohepatic recycling, can significantly prolong the presence and effects of a substance in the body. To interrupt this cycle, specific substances...
Allergic Drug Reactions01:27

Allergic Drug Reactions

Allergic reactions related to drugs are hypersensitivity responses driven by the immune system and bear no connection to the drug's therapeutic action. While drugs in isolation do not trigger an immune response, they can interact with endogenous proteins to form antigens. These antigens stimulate lymphocytes to produce antibodies. IgE-type antibodies attach themselves to mast cells. Upon subsequent exposure to the same stimulus, the antigen-antibody interaction is initiated, unleashing numerous...
Drug Delivery: Miscellaneous Routes01:22

Drug Delivery: Miscellaneous Routes

Drug delivery methods like oral inhalation, nasal sprays, transdermal patches, eye drops, intravitreal injection,  and rectal administration provide localized effects with reduced toxicity.
Oral inhalation and nasal sprays swiftly transfer drugs across the respiratory epithelium's mucosal layer. Inhaled glucocorticoids and bronchodilators directly target lung conditions such as asthma, while fluticasone nasal spray mitigates allergic rhinitis.
Transdermal patches transport drugs through the...
Drug Delivery: Overview01:16

Drug Delivery: Overview

The selection of a drug's delivery route depends upon its physicochemical properties, including lipid or water solubility and ionization, as well as the therapeutic requirement, such as immediate or sustained effect. These routes can be divided into three primary categories: enteral, parenteral, and topical.
Enteral delivery involves administering drugs directly through swallowing, sublingual placement, or buccal application. Orally administered drugs predominantly navigate the gastrointestinal...
Effects of Chemicals: Overview01:27

Effects of Chemicals: Overview

Drugs, encompassing various chemical compounds from natural sources, lab synthesis, or genetic engineering, elicit different biological responses in living organisms. Some of these responses are desirable or therapeutic, while others are undesirable. The primary goal of administering a drug is to achieve a therapeutic effect, that is, to address a specific disease or health condition. Any concurrent effects outside of this therapeutic outcome are considered undesirable. These undesirable...

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Related Experiment Video

Updated: Jun 12, 2026

Visualizing and Quantifying Pharmaceutical Compounds within Skin using Coherent Raman Scattering Imaging
11:07

Visualizing and Quantifying Pharmaceutical Compounds within Skin using Coherent Raman Scattering Imaging

Published on: November 24, 2021

[KEY POINTS FOR DRUG ERUPTIONS IN DAILY PRACTICE].

Yuko Watanabe1

  • 1Department of Environmental Immuno-Dermatology, Yokohama City University Graduate School of Medicine.

Arerugi = [Allergy]
|June 10, 2026
PubMed
Summary

Drug eruptions, common skin reactions to medications, are hard to diagnose due to varied symptoms. Early identification of the culprit drug is key to preventing recurrence and ensuring safe future treatments.

Area of Science:

  • Dermatology
  • Pharmacology
  • Clinical Medicine

Background:

  • Drug eruptions are frequent mucocutaneous adverse reactions affecting 0.1-1% of patients.
  • Diagnosis is challenging due to diverse presentations and differential diagnoses like viral exanthems.
  • Stevens-Johnson syndrome and toxic epidermal necrolysis are severe, life-threatening conditions requiring prompt recognition.

Purpose of the Study:

  • To outline a diagnostic strategy for drug eruptions.
  • To emphasize the importance of identifying causative agents.
  • To reduce mislabeling of drug allergies and improve pharmacotherapy.

Main Methods:

  • Comprehensive evaluation of medication history, infection status, latency, and clinical phenotype.
  • Consideration of diagnostic tests like drug-induced lymphocyte stimulation test, skin testing, and drug provocation.
Keywords:
diagnostic testsdifferential diagnosisdrug eruption

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Precision Implementation of Minimal Erythema Dose (MED) Testing to Assess Individual Variation in Human Inflammatory Response
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Precision Implementation of Minimal Erythema Dose (MED) Testing to Assess Individual Variation in Human Inflammatory Response

Published on: October 3, 2019

Related Experiment Videos

Last Updated: Jun 12, 2026

Visualizing and Quantifying Pharmaceutical Compounds within Skin using Coherent Raman Scattering Imaging
11:07

Visualizing and Quantifying Pharmaceutical Compounds within Skin using Coherent Raman Scattering Imaging

Published on: November 24, 2021

Precision Implementation of Minimal Erythema Dose (MED) Testing to Assess Individual Variation in Human Inflammatory Response
06:31

Precision Implementation of Minimal Erythema Dose (MED) Testing to Assess Individual Variation in Human Inflammatory Response

Published on: October 3, 2019

  • Selection of diagnostic modalities based on clinical phenotype, severity, and timing.

    • Main Results:

    • A structured, time-conscious diagnostic approach is essential.
    • Accurate identification of culprit drugs prevents recurrence and preserves future therapeutic options.
    • Appropriate diagnostic strategies can reduce incorrect drug allergy labeling.

    Conclusions:

    • Early recognition and accurate diagnosis of drug eruptions are critical.
    • Identifying the causative drug is paramount for patient safety and future treatment.
    • A systematic diagnostic strategy enhances pharmacotherapy safety and efficacy.