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Allergic Drug Reactions

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...

Hypersensitivities

Hypersensitivities

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
Hypersensitivity reactions are categorized into four types: Type 1, Type 2, Type 3, and Type 4. Each type has a distinct mechanism...

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...

Drug Toxicity: Allergic Reactions

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...

Allergic Reactions: Anaphylaxis

Allergic Reactions: Anaphylaxis

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, heparin),...

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...

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Related Experiment Video

Updated: Jul 16, 2026

Basophil Activation Test for Investigation of IgE-Mediated Mechanisms in Drug Hypersensitivity

Basophil Activation Test for Investigation of IgE-Mediated Mechanisms in Drug Hypersensitivity

Published on: September 16, 2011

Handedness as a marker for drug hypersensitivity.

¹Department of Psychology, University of British Columbia, Vancouver, Canada. scoren@cortex.psych.ubc.ca

|October 30, 2004

Summary

Left-handers report more adverse drug reactions, including rashes and dizziness. This increased sensitivity to medications is not explained by higher drug usage, suggesting underlying biological differences.

Area of Science:

Neuroscience
Pharmacology
Human Biology

Background:

Emerging evidence suggests left-handed individuals may exhibit heightened responses to pharmaceutical agents.
Previous studies and anecdotal observations point to potential differences in drug reactivity based on handedness.

Purpose of the Study:

To investigate whether left-handers experience a higher incidence of hypersensitivity reactions to commonly prescribed drugs.
To explore potential confounding factors, such as overall medication use, that might influence observed differences in drug reactions.

Main Methods:

A survey of 747 adults assessed the occurrence of hypersensitivity signs to common medications.
A subsequent experiment involving 840 adults controlled for potential confounders related to general drug consumption patterns.

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Basophil Activation Test for Investigation of IgE-Mediated Mechanisms in Drug Hypersensitivity

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Main Results:

Left-handers were significantly more prone to experiencing constipation, dizziness, and skin rashes.
Left-handed individuals were nearly three times more likely to report miscellaneous adverse drug reactions.
Left-handers were almost twice as likely to require medication dosage adjustments due to side effects.
Results were not attributable to left-handers simply using more medications.

Conclusions:

Left-handedness is associated with a significantly higher likelihood of experiencing adverse drug reactions and requiring dosage modifications.
Potential underlying mechanisms include differences in brain morphology, birth stress-related neuropathy, and immune system variations.
Further research into the biological underpinnings of handedness-related drug sensitivity is warranted.