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Rendering the skin susceptible to damage by light. Used of certain medications and cosmetics.

pho′to·tox·ic′i·ty (-tŏk-sĭs′ĭ-tē) n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Pharmacology) damage, esp to the skin, as a result of exposure to light
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
Of late, due to the invention of second-generation PDT using talaporfin sodium and diode laser, photodynamic therapy is being performed with less phototoxicity and has gained momentum in the treatment of esophageal squamous cell carcinoma (ESCC).
While "warm white" domestic LED lighting has weak phototoxicity risks, similar to traditional lighting, other LED lighting sources, including the newest flashlights, car headlights and some toys, produce a whiter and "colder" blue light that is more harmful.
Phototoxicity is also known as a chemically induced skin irritation called photoirritation that requires light.
The company has been making heavy investments in advanced technologies and have diversified their fluorescence microscopy product portfolio that enables deep research with low phototoxicity and speedier imaging at high resolution.
Together they cover skin irritation/corrosion, ocular toxicity, skin sensitization, phototoxicity, and genotoxicity, i.e., the basic and most important toxicological endpoints of cosmetics safety assessment (4,5,6,7).
However, in a study, 30 patients with an HIV infection were applied hypericin in the Phase 1 study, and they did not show any improvement in virological markers and CD4 cell counts, developing serious phototoxicity in 1999 (6).
The suite of services covers more than 50 analytical techniques including dermal and ocular toxicity, cytotoxicity, genotoxicity, carcinogenicity, phototoxicity, endocrine disruption, hepatotoxicity and cardiotoxicity.
'We have been making a substantial investment in advanced technologies for life science imaging, and have built up a portfolio of fluorescence microscopy products that enable biologists in research areas that require deep, fast imaging at high resolution and at low phototoxicity,' commented Dr Mark Munch, president of the Bruker Nano Group.
Role of oxygen radicals in the phototoxicity of tetracyclines toward Escherichia coli B.
Schein, "Phototoxicity and the cornea," Journal of the National Medical Association, vol.