This study is designed to evaluate the effect of lovastatin on the prevention of contrast-induced nephropathy in receiving intravenous contrast patients. Single center randomized, double-blind study will be conducted on 122 patients. After consent obtaining, patients information’s such as age, sex, history of chronic and acute renal disease, underlying disease, diagnostic intervention, drug history, previous use of statins and known history of statins hypersensitivity will be recorded. The subjects randomly will be divided into drug and placebo groups. In the lovastatin group, 60 milligrams lovastatin will be administered 24 hours before diagnostic procedures, the day of the procedure and 24 hours after contrast injection. In the placebo group, placebo will be administered 24 hours before, the day of the procedure and 24 hours after contrast injection. In the first time and 48 hours after contrast injection to measure serum creatinine, blood samples will be taken. Increased serum creatinine greater than 0.5 mg per deciliter or an increased more than 25 percent of the base is considered as contrast-induced acute kidney injury.