Oh KLM67, good news - I've just read that Dulcolax is actually Bisacodyl which until recently I had taken in rather large doses for a number of years by which time it had started to irritate my system. I have needed to create diarrhoea to get poo passed the gnarly obstruction I have at my splenic flexure for years now.
I don't have the prep instructions handy at the moment, but if its a dosage
of 2 x 5mg, hopefully it won't irritate your digestive system too much.
I'm shopping for tena lady knickers today as we have a 45 minute drive on the highway on Wednesday morning & packing a change or two of clothes!