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Topical protection against long-wave ultraviolet A.
Journal of the American Academy of Dermatology
|September 1, 1983
Summary
A PABA ester-oxybenzone sunscreen is more effective than PABA or sulisobenzone alone for preventing UVA phototoxicity. This combination offers superior protection against ultraviolet A (UVA) damage and related skin conditions.
Area of Science:
- Dermatology
- Photobiology
- Cosmetic Science
Background:
- Methoxsalen (psoralen) and ultraviolet A (UVA) light therapy (PUVA) can cause skin phototoxicity.
- Protecting the skin from UVA radiation is crucial for preventing phototoxic reactions and long-term sun damage.
Purpose of the Study:
- To evaluate the efficacy of a PABA ester-oxybenzone preparation compared to PABA or sulisobenzone alone.
- To determine the effectiveness of a UVA screen in preventing methoxsalen-induced phototoxicity after water exposure.
Main Methods:
- Assessing skin protection against methoxsalen-induced UVA phototoxicity.
- Testing sunscreen efficacy after a water substantivity challenge.
Main Results:
- The PABA ester-oxybenzone preparation demonstrated superior protection compared to PABA or sulisobenzone used individually.
- The combination effectively protected the skin from UVA phototoxicity even after water exposure.
Conclusions:
- A PABA ester-oxybenzone mixture is an effective UVA screen for patients undergoing PUVA therapy.
- This preparation may also help prevent UVA-induced conditions such as solar urticaria, polymorphic light eruptions, and solar elastosis.