The Action Spectrum in Drug Induced Photosensitivity

A new method is proposed for expressing the data obtained from in vivo studies of drug‐induced photosensitivity. It is shown that consideration of the underlying normal photobiological responses that occur in the absence of the photosensitising drug can yield much closer agreement between the in vitro absorption spectrum of the drug and the action spectrum obtained in photosensitised skin than is apparent from many published reports.