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Allergic Drug Reactions01:27

Allergic Drug Reactions

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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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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.
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While local anesthetics are generally safe and well-tolerated, they can occasionally cause adverse effects that vary in severity. Local anesthetics can induce toxicity at two distinct levels. They can either produce local effects through direct contact with the neural elements or be absorbed into the bloodstream from the injection site, leading to systemic effects.
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Related Experiment Video

Updated: Jun 26, 2025

Acupoint Catgut Embedding Therapy in Traditional Chinese Medicine for Managing Allergic Rhinitis
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Published on: December 20, 2024

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Long-Term Outcomes Associated With β-Lactam Allergies.

Matthew P Gray1, John A Kellum2, Levent Kirisci1

  • 1Department of Pharmacy and Therapeutics, University of Pittsburgh School of Pharmacy, Pittsburgh, Pennsylvania.

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|May 17, 2024
PubMed
Summary

Beta-lactam (BL) allergies do not increase mortality risk but are linked to antibiotic-resistant infections. Accurate allergy documentation and reduced BL avoidance are crucial for healthcare systems.

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Area of Science:

  • Infectious Diseases
  • Clinical Pharmacology
  • Health Services Research

Background:

  • Beta-lactam (BL) allergies are common but often misdiagnosed, posing risks for adverse drug events and antibiotic resistance.
  • Understanding the long-term health outcomes for patients with BL allergies is limited.

Purpose of the Study:

  • To evaluate the long-term clinical outcomes, including mortality and antibiotic-resistant infections, in patients with documented beta-lactam allergies.

Main Methods:

  • A longitudinal retrospective cohort study analyzed electronic health records of over 20,000 patients with sepsis, pneumonia, or UTI from 2007-2008.
  • Patients were followed until 2018, with outcomes including all-cause mortality, methicillin-resistant Staphylococcus aureus (MRSA), Clostridium difficile, vancomycin-resistant Enterococcus (VRE), and acute kidney injury (AKI).
  • Generalized estimating equations were used to compare outcomes between patients with and without documented BL allergies.

Main Results:

  • Documented BL allergies were not significantly associated with increased all-cause mortality (OR, 1.02).
  • BL allergies were associated with higher odds of MRSA (OR, 1.44) and VRE (OR, 1.18) infections, and pooled antibiotic-resistant infections (OR, 1.33).
  • No significant association was found between BL allergies and Clostridium difficile infection or acute kidney injury.

Conclusions:

  • Documented beta-lactam allergies are not linked to long-term mortality but are associated with increased risk of antibiotic-resistant infections.
  • Healthcare systems should prioritize accurate allergy documentation and minimize unnecessary avoidance of beta-lactam antibiotics.