Maureen White
                    
                    
                    
                    
                    
                    
                    
                        
                        
                        I was using ditropan for over a year and didn't have any of the usual porph reactions.  I have changed to Detrol because the ditropan stopped working.  I do not completely understand what robinul is but I would inform my doctor if I had a hepatice form of porphyria, such as AIP, VP, etc, before taking the drug.  Good Luck.