Dear All I have seen many postings such as this; " Note It is particularly important that the potentially fatal interaction between Selegiline [DEPRENYL/ELDEPRYL] and Pethidine is noted." but cannot find any actual medical authority. I might be having a back operation shortly which could involve me being given Pethidine ( Demerol) for pain relief. My nuerologist said there,s no interaction problem to worry about. If there is some interaction I would like to give him some factual evidence from pubished research etc and not just hearsay. Any info would be most welcome. David Langridge