1. a toxic reaction of the skin to a substance (such as a drug or chemical) when exposed to sunlight or ultraviolet radiation
Usage: medical/scientific term; uncountable noun

Examples

• Certain antibiotics can cause phototoxicity if you spend time in the sun while taking them.
• The dermatologist warned that the medication might trigger phototoxicity in patients with sensitive skin.
• Phototoxicity differs from photoallergy in that it does not require prior sensitization.
• Some sunscreen ingredients have been studied for their potential to cause phototoxicity.
• Patients taking tetracycline antibiotics should be aware of the risk of phototoxicity.
• The phototoxicity of the chemical compound was confirmed through laboratory testing.