You def want to take them in your carry on, you don't want them in your checked bags b/c of possibly getting lost and also I don't think it's climate controlled where the luggage goes.
I'm in the US and I just flew a couple weeks ago. I told the security guard who checked my ID and boarding pass and he said just take them out of my bag and put them in the container to go through the scanner. The guards working the scanner didn't say a word about it. (I had Rowasa enemas in a plastic zip loc bag)
You may want to have the labels on them with the script from the doc (or the label from the pharmacy) for proof but the guards I encountered didn't even check that. Better safe than sorry though.
Have a nice trip.
*Amy, 33, dx with idiopathic colitis July 2009, confirmed UC Sept 2009
Asacol 3 pills 3 times daily (started this 1/09/10, was on 6 daily)
Rowasa as of 10/20/09, starting taper 11/18, nope, back to nightly!
Probiotic: Ultimate Flora Critical Care