Phototoxicity to benoxaprofen

Area of Science:

• Dermatology
• Photobiology
• Pharmacology

Background:

• Benoxaprofen, an NSAID, has been associated with photosensitivity reactions.
• Understanding the specific wavelengths and reaction patterns is crucial for patient safety.

Purpose of the Study:

• To investigate the characteristics of benoxaprofen-induced photosensitivity in human volunteers.
• To identify the specific ultraviolet (UV) wavelengths responsible for the reaction.
• To determine the clinical presentation, onset, duration, and risk factors associated with this photosensitivity.

Main Methods:

• Human volunteers were exposed to controlled UV radiation.
• The study focused on the near-ultraviolet (UVA) and the terminal portion of the UVB regions.
• Clinical observations of skin reactions, including burning, itching, erythema, and whealing, were recorded.

Main Results:

• Photosensitivity reactions were mediated by UVA and the terminal UVB wavelengths.
• The reaction is characterized by immediate burning and redness, often with itching, typically resolving within an hour.
• High UVA doses could induce whealing; a sunburn-type reaction was noted at 24 hours with large UVA doses.
• The photosensitivity is phototoxic, appearing within 48 hours of drug initiation and resolving within 48 hours of discontinuation.
• Individuals with light skin (Type 1 and 2) are most at risk, while pigmented races and dark-skinned individuals exhibit resistance.

Conclusions:

• Benoxaprofen photosensitivity is a phototoxic, immediate-type reaction predominantly triggered by UVA radiation.
• The reaction is short-lived and primarily affects light-skinned individuals.
• Sun protection measures, such as deep tanning and SPF 15 sunscreens, offer adequate protection for at-risk populations.