Clearance fra forskellige væv foregår i løbet af 40- 72 timer, men tumorer, hud og organer i det retikuloendoteliale system (inklusive lever og milt) tilbageholder natriumporfimer i længere tid.
10 Clearance from a variety of tissues occurs over 40-72 hours, but tumours, skin, and organs of the reticuloendothelial system (including liver and spleen) retain porfimer sodium for a longer period.