What does photosensitized mean?
Photosensitized means abnormally sensitive to light as a result of exposure to a drug, chemical, medical treatment, or other photosensitizing agent. The phrase is most often used in medicine to describe skin that has become vulnerable to ultraviolet radiation, potentially leading to painful sunburn, blistering, or a rash after exposure to sunlight or tanning lamps. It can also describe cells, materials, or chemical systems that have been prepared so that they respond to light. In these contexts, the word indicates an induced or increased sensitivity rather than the ordinary sensitivity of a photographic material. Photosensitized is closely related to photosensitivity, the condition or process of becoming unusually light-sensitive, and to the verb photosensitize. Understanding the term is important when reading medication guidance, oncology information, and warnings about drugs that can make sun exposure dangerous.
Having been made unusually sensitive to light, especially to ultraviolet radiation.
"Patients with photosensitized skin should avoid prolonged exposure to direct sunlight."
Common in medical guidance concerning drugs, medical treatments, and skin reactions.
Prepared or treated so as to respond to light.
"The researchers compared the response of the photosensitized polymer with that of an untreated sample."
Used in scientific and technical contexts for cells, materials, and chemical systems.
Past tense and past participle of photosensitize: to make someone or something unusually sensitive to light.
"The medication photosensitized her skin."
The participial form is used adjectivally far more often than it is used as a finite past-tense verb.
Photosensitized skin can turn a sunny day into a UV hazard.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does photosensitized come from?
The word combines the combining form photo-, derived from Greek phōs, “light,” with sensitive and the suffix -ize, associated with making or causing something to become something. Its medical sense developed from the broader idea of making a person or substance more responsive to light. The related noun photosensitivity and the process noun photosensitization were formed from the same components.
Related word forms
How photosensitized is actually used
The term is most common in medical and scientific contexts. In clinical writing, it often indicates increased sensitivity to ultraviolet light rather than sensitivity to visible light alone. The British spelling of the related verb is photosensitised, but the form photosensitized is also widely used.
Easily confused with photosensitized
Photosensitive describes something that is inherently or ordinarily responsive to light, whereas photosensitized usually emphasizes a condition or process that has made it unusually sensitive to light.