If I remember (and I don't very well) doctor said Colazal was best for left-sided which I have.
I am telling you that the two weeks I went without anything (after quitting Colazal and Rowasa cold turkey Labor Day weekend) I felt the best. Then I saw the NP and I knew I had to be on something - I was not in full remission. However, no blood I could see, little left sided "discomfort" and normal one or two BM's. Then she added Rowasa back every other day and it is helping but makes me sore and the headaches and anxiety is worse. So, she consulted with doc and he said add Lialda and see him in three months. I have a feeling I will be calling her - I will, however, give it a fair trial. Last time I had to stay home 5 days - before I stopped the meds. I was so sick with dizzy, nausea, aching, etc.
I will let you all know what happens! I am VERY tempted to go back to just Imodium and pepto bismal as I have used for a year until I get too sick to handle it that way.
ElaineNY