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Related Concept Videos

Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

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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...
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Hypersensitivity, also known as a hypersensitivity reaction or allergic reaction, is a condition where the body's immune system reacts abnormally to a foreign substance. Such substances, that cause hypersensitivity are referred to as an allergen, could be something typically harmless to most people, like pollen or certain foods.
Types of Hypersensitivities
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Allergic Reactions: Anaphylaxis01:30

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Anaphylaxis is a severe, life-threatening hypersensitivity reaction mediated by Immunoglobulin E (IgE) antibodies. When IgE binds to allergens, it triggers the release of mediators– histamine, leukotrienes, and prostaglandins from mast cells and basophils. These mediators cause vasodilation, edema, and inflammation, leading to various symptoms.The primary allergens causing anaphylaxis include food items (e.g., peanuts, shellfish), drugs (e.g., penicillin, asparaginase, corticotropin,...
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Allergic Drug Reactions01:27

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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...
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Asthma is a chronic respiratory condition for which new therapeutic avenues, including anti-inflammatory drugs like mast cell stabilizers and anti-IgE treatments, continue to be developed.
Mast cell stabilizers, such as cromolyn (also known as sodium cromoglycate) and nedocromil (Tilade), are effective drugs in asthma management. These stabilizers hinder histamine release by skillfully obstructing the activation of mast cells and other cellular entities. Notably, they navigate this task without...
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Allergic contact dermatitis in preservatives: current standing and future options.

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Preservatives like isothiazolinones are major causes of skin contact allergy. New alternatives with better safety profiles are needed to control widespread sensitization and protect public health.

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Area of Science:

  • Dermatology
  • Toxicology
  • Cosmetic Science

Background:

  • Preservatives are essential in preventing microbial contamination in consumer products.
  • However, many preservatives are known skin sensitizers, leading to allergic contact dermatitis.
  • Contact allergy to preservatives is a significant public health concern.

Purpose of the Study:

  • To review the current landscape of preservative-induced contact sensitization.
  • To identify prevalent allergens and emerging concerns.
  • To explore potential future alternatives for product preservation with improved safety profiles.

Main Methods:

  • Literature review of current research on preservative contact allergy.
  • Analysis of epidemiological data on sensitization rates in Europe and the United States.
  • Discussion of regulatory interventions and their impact.

Main Results:

  • Isothiazolinones are the leading cause of preservative allergy in Europe and the US, with outbreaks ongoing despite regulations.
  • Methyldibromo glutaronitrile exposure continues post-cosmetic ban, indicating other sources.
  • Formaldehyde and formaldehyde-releasers show lower sensitization rates in Europe due to stricter regulations; parabens remain stable, while iodopropynyl butylcarbamate is an emerging allergen.

Conclusions:

  • High rates of sensitization necessitate urgent regulatory action for concerning preservatives.
  • Development of preservatives with broad-spectrum antimicrobial activity and reduced sensitization potential is crucial.
  • Addressing non-regulated sources of exposure is vital for controlling allergic contact dermatitis.