I have been taking cellcept (mycophenolate mofetil) and prednisone for almost a year. what would happen if i just stop taking both of them?

Dangerous: First of all whatever disease they are being used for could worsen rapidly. For example if used for a kidney transplant, the kidney could stop working. More importantly, stopping prednisone abruptly can cause adrenal insufficiency which can cause many problems including death. When you take prednisone the body stops its normal production of a steroid similar to prednisone and is necessary to live