Does Taking Cyclosporine Causes Kidney Damage And Increase In Creatinine Levels?

I am seetaramarao of age 37. i am using the cyclosporine 50mg since 12yrs. I heard that long usage of this medicine will cause damage to kidney and gradual increase in creatinine levels. recently ihave done the biopsy to my transaplanted kidney and doesnot shows any cyclosporine toxins. please suggest me, do i switch to new drug or can i continue my medication as below.
cyclosporine 50mg (morning) 50mg (evening) Aten 50mg 1, Azoran 25mg day by day, Prednisomone 5 mg -1, Amlosafe 5MG -1.
Transplanted date 1-4-1998. donor -own bother