It is good that you underwent a colonoscopy
and the biopsy showed it to be non specific proctitis
. It could be the start of an inflammatory bowel disease
and that is why you have been started on those medications. Out of the medications you are taking, you need to be careful about mesacol, as it can have some side effects.
First of all, you should not be sensitive to the drug. Other than that, you can have minor side effects like headache, fever, diarrhea
. The major side effects you need to be careful about are - aplastic anemia
(blood cells stop forming) and renal toxicity. To monitor these, you need to get your blood counts done regularly along with kidney function tests.
I think you should take the medications as prescribed by your doctor and see whether they benefit you or not. You can undergo a repeat colonoscopy after a few months of taking these medications.