Hi..welcome to the forum!
Left-sided UC would definitely be past the sigmoid and up into the descending colon...did the doc say your UC is left-sided?
Are you also on any oral 5ASA med such as Asacol?
The Canasa will take at least a few weeks for you to notice a lot of improvement....use them nightly.
If you don't improve any over the next week or two, call the doc and get him to either up the dosage to twice daily or to prescribe you retention enemas.
Keep us posted as to how you're doing,
*Heather*Status: mini flare Dec 28... tapered to every 4th night
~diagnosed January 1989 UC (proctosigmoiditis)
~5ASA: Asacol (6 daily) + Salofalk enemas (increase for flares tapered to maintenance)
~Bentylol (dicyclomine) 20mg as needed
~Probiotic 3(Natural Factors Protec) bedtime + 1 (Primadophilus Reuteri) occasionally
~multi-digestive enzymes as needed ....zymactive 3 - 5x daily
~Ranitidine,Pariet (reflux) Effexor XR 75mg; Pulmicort/Airomir (asthma)
~URSO for PSC (or PBC) 500mg X 2 daily (LFTs back to NORMAL!!)
My doc's logic.. "TREAT (FROM)BOTH ENDS" worth it !!!