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Drug-induced photosensitivity.

Robert S Dawe1, Sally H Ibbotson1

  • 1Photobiology Unit, Department of Dermatology, Ninewells Hospital and Medical School, University of Dundee, Dundee DD1 9SY, Scotland, UK.

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Summary
This summary is machine-generated.

Drug-induced photosensitivity, often caused by phototoxicity or photoallergy, requires identifying the offending agent. While photopatch testing aids topical allergies, managing systemic drug photosensitivity typically involves drug cessation.

Keywords:
DrugPhotoallergyPhotosensitivityPhototoxicityXenobiotic

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Area of Science:

  • Dermatology
  • Pharmacology

Background:

  • Drug-induced photosensitivity is a frequent adverse reaction.
  • Photosensitivity mechanisms include phototoxicity (systemic) and photoallergy (topical).

Purpose of the Study:

  • To differentiate mechanisms and diagnostic approaches for drug-induced photosensitivity.
  • To outline management strategies for photosensitive reactions to medications.

Main Methods:

  • Review of mechanisms of photosensitivity.
  • Discussion of diagnostic utility of photopatch testing.
  • Analysis of management options.

Main Results:

  • Phototoxicity and photoallergy are distinct mechanisms.
  • Photopatch testing is effective for topical photoallergies but not systemic drug reactions.
  • Discontinuation of the causative drug is the primary management strategy.

Conclusions:

  • Understanding the mechanism is key to diagnosis and management.
  • Photopatch testing is valuable for specific topical agents.
  • Management often involves drug withdrawal, with phototherapy as an alternative.