@bosco17,
Here is what the National Kidney Foundation says about immunosuppressants

What are immunosuppressants used for?
When you get a kidney transplant, your body knows that the new kidney is foreign (that is, not originally part of your body). Your body will attack the new kidney and try to damage or destroy it. The immunosuppressant drugs suppress your body's ability to do this. The goal is to adjust these drugs to prevent rejection and to minimize any side effects of the drugs.
If you go to this link you will find some more information about immunosuppressant medications. https://www.kidney.org/atoz/content/immuno#

Bosco17, You have mentioned GI problems recently. Are these problems new since your transplant? Do you think that the immunosuppressant meds are the cause? What are your doctors saying about it?