(274)... My ratio is 3.1 which is normal. I feel that due to renal side effects I should not be taking Crestor. What do you think? Crestor was prescribed by my family doctor should I consult my kidney specialist? I have never had high cholesterol before but recently gained 30 lbs and could not exercise due to my health issues. I have lost 18 lbs so far and walk 40 minutes almost every day now.