<prompt> Non-pigmenting fixed reactions is caused by:SulphonamidesAmpicillinPseudoephedrineCarbamazepine  <response>: Non-pigmenting fixed reactions have been repoed with sympathomimetic agents pseudoephedrine, tetryzoline hydrochloride, difunisal, thiopental thiopentone, piroxicam, Radiopaque contrast medium iothalamate, arsphenamine paracetamol. Ref: Rooks textbook of dermatology, 8th edition, Pg 75.48. 