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Drug Toxicity: Allergic Reactions01:30

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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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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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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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Inhaled corticosteroids (ICS) are anti-inflammatory drugs used primarily in treating persistent asthma and providing long-term maintenance. They target the bronchial mucosa, the lining of the airways, to control inflammation, a critical factor in asthma progression and exacerbation.
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Type III hypersensitivity reactions occur when antigen–antibody complexes form and activate the complement system. Normally, these complexes help the clearance of antigens by phagocytes and red blood cells. However, when large numbers of immune complexes are present, they can deposit in tissues—particularly in the walls of blood vessels—leading to inflammation and tissue injury. These deposits trigger complement activation and neutrophil recruitment, resulting in serum...
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Glucocorticoids induced allergic reaction.

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Glucocorticoids rarely cause allergic reactions. A young asthmatic patient experienced adverse effects after a glucocorticoid injection, including nausea and swelling, but recovered spontaneously.

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Area of Science:

  • Allergy and Immunology
  • Pediatric Medicine
  • Pharmacology

Background:

  • Glucocorticoids are widely used for their anti-inflammatory properties.
  • Allergic reactions to glucocorticoids are uncommon but can occur.
  • Asthma management often involves glucocorticoid therapy.

Observation:

  • A 10-year-old boy with asthma received an intramuscular glucocorticoid injection.
  • Following the injection, the patient developed nausea, vomiting, abdominal pain, pallor, palpitations, and headache.
  • Physical examination revealed eyelid and lip swelling, tachycardia (177/min), and hypotension (66/46 mmHg).

Findings:

  • The patient experienced a rare allergic-type reaction to glucocorticoid therapy.
  • Symptoms included gastrointestinal distress, cardiovascular instability, and localized swelling.
  • The reaction was transient, with spontaneous resolution of all symptoms.

Implications:

  • This case highlights the potential for rare adverse reactions to glucocorticoids in pediatric patients.
  • Clinicians should be aware of the possibility of allergic reactions, even with standard treatments.
  • Prompt recognition and monitoring are crucial, although specific interventions were not required in this instance.