Solar urticaria is a rare photodermatosis that results in rashes and hives when the skin is exposed to ultraviolet radiation (sunlight). It is an allergic reaction--treatable with antihistemines--and overexposure can cause anaphylaxis.

Fexofenadine hydrochloride is the active ingredient in Allegra. Terfenadine is used to treat solar urticaria (in humans), but was restricted as a prescription antihistamine in 1997 after being linked to cardiac complications.

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