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I had loose bowels a few times a day during and after my EBRT. I don't recall how long it took to clear up but it was quite a while. If meds don't help, try a diet change. I remember the BRAT diet helped me: bananas, rice, applesauce and tea. The docs said to avoid fiber because it would irritate the delicate tissues in the colon.
I had fairly severe bowel problems which started three days into the R/T. !
Codeine phosphate might help a bit, but don't stay on it for too long.
Low fibre diet as Paul suggests. I also avoided gluten completely and yeast.However, recovery can vary from a few weeks to over a year to settle down. I still ( over four years on ) must ensure bowels are empty before going out in the mornings.