We don't have Tylenol in the UK unfortunately :( Anything stronger than 500mg of paracetamol and we need a prescription.
Val, you could ask your GP to prescribe you some Movicol, it's brilliant stuff for keeping bm's soft. You can take it until 12hrs before surgery, I'm being admitted at 12:30 lunchtime when I go in, so I'll be waking up at midnight before to take my last one :)
It literally sits in the colon and isn't absorbed, it draws water into the colon and makes the BM soft.
It's a white powder sachet that you mix with water, it tastes a bit like andrews salts, so much easier to take than fybogel or anything like that :)
Good luck xx