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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 exposure to a...

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Delayed-Type Hypersensitivity (DTH), or Type IV hypersensitivity, is a cell-mediated immune response. It occurs when T cells, rather than antibodies, mediate a reaction to specific antigens. It is characterized by a delayed onset (1-2 days) and involves the recruitment of macrophages to the inflammation site.The initiation of a DTH response begins with the sensitization of T cells. During this phase, which lasts at least 1-2 weeks, antigen-specific T cells are activated, clonally expanded, and...

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Dermoscopy Aids in the Diagnosis of Discoid Lupus Erythematosus

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Dapsone-induced photosensitivity: a rare clinical presentation.

Bikash Ranjan Kar¹

¹Department of Dermatology, Institute of Medical Sciences & SUM Hospital, Orissa, India. karbikash@yahoo.com

Photodermatology, Photoimmunology & Photomedicine

|September 25, 2008

Summary

Dapsone, a key leprosy treatment, can cause rare photosensitivity. This adverse effect, independent of dosage, necessitates awareness in patients with inflammatory skin conditions.

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Area of Science:

Pharmacology
Dermatology
Infectious Diseases

Background:

Dapsone is a cornerstone anti-inflammatory and antimycobacterial drug used in multidrug therapy (MDT) for leprosy.
Its mechanism involves interfering with folate metabolism.
Dapsone-induced photosensitivity is a rare, idiosyncratic adverse effect.

Observation:

A case of dapsone-induced photosensitivity is reported in an Indian patient diagnosed with leprosy.
This adverse event occurred despite dapsone being a standard treatment.

Findings:

Dapsone-induced photosensitivity is a rare, non-dose-related adverse effect.
The condition can manifest in patients with inflammatory skin disorders, including leprosy.
This report adds to the limited documented cases in medical literature.

Implications:

Clinicians should be vigilant for photosensitivity reactions in patients treated with dapsone, particularly those with inflammatory skin conditions.
Early recognition and management of dapsone-induced photosensitivity are crucial for patient well-being.
Further research may elucidate the precise mechanisms and risk factors for this rare adverse effect.