<prompt> Pseudoporphyria can be induced by all exceptMethotrexateNalidixic acidNaproxenIsotretinoin  <response>: Pseudoporphyria is generally due to drugs or other agents which interact with sunlight to cause a phototoxic reaction in the skin. These include:Non-steroidal anti-inflammatory drugs e.g. naproxenAntibiotics - doxycycline, nalidixic acidDiuretics - chlohalidone, bumetanide, furosemide frusemide and hydrochlorothiazidetriamtereneRetinoids - isotretinoin, etretinate, acitretinOral contraceptivesref:Harrisons 18e p414,415 