Dear Praying Daughter,
When my husband started having kidney problems, our family doctor put him on a med called Allopurinol - 300 mg - once daily. It brought his creatinine level back to normal. The med helps break down the proteins he is putting out through his kidneys. It might be worth asking your doctor about, if high creatinine levels are causing problems with your Dad.
Best of luck!
Jan (we'vebeenthere)