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Performance of coronary angiography for exact diagnosis and treatments of cardiovascular disease have been increased recently and it also brings increase of the contrast-induced nephropathy (CIN) referred from increasing use of radiological contrast agents. The variation of estimated glomerular filtration rate (eGFR) is an indicator of CIN, which is known to increase when renal function is decreased. Therefore, this study was to evaluate the affecting factors including concomitant drug on variation of eGFR of patients who underwent coronary angiography according to the conditions of renal function. Medical records of 66 patients were evaluated retrospectively and the patients underwent coronary angiography or angioplasty with nonionic and isotonic contrast media (iodixanol) at Chungnam national university hospital from 1 Jan 2008 to 30 Jul 2010. Patients group was divided into 2 groups; the patients in stages 3-4 chronic kidney disease (CKD) and the patients in stage 2 CKD. Each group was researched about the effect of concomitant drug and clinical characteristics on eGFR variation. The change of eGFR was compared among baseline and 2 or 3 day after coronary angiography. In results, the eGFR variation in group over age 75 was significantly decreased after radiological contrast agents exposure ( p≤0.05). The eGFR variation in anemia was significantly decreased after radiological contrast agents exposure in stage 2 CKD (p > 0.05). The eGFR variation in group under HbA1c 6.5% was significantly decreased after radiological contrast agents exposure in stages 3-4 CKD (p≤0.05). The eGFR variation by taking statins, angiotensin converting enzyme inhibitors, calcium channel blockers and nitroglycerin was increased after radiological contrast agents exposure in stage 2 CKD (p≤0.05 ). The eGFR variation by using of diuretics was significantly decreased after radiological contrast agents exposure in stages 3-4 CKD (p≤0.05 ). The eGFR variation by taking statins, nitroglylcerin was increased after radiological contrast agents exposure in stages 3-4 CKD (p > 0.05). The eGFR variation in group over contrast dosage 150 ml was significantly decreased after radiological contrast agents exposure in stages 3-4 CKD (p≤0.05 ). Threrefore, when undergoing coronary angiography, contrast dosage should be minimized less than 150 ml, and diuretics should be restricted as possible in stages 3-4 CKD. Patients over age 75 require special attention to prevent CIN, and if patients undergo coronary angiography in stages 3-4 CKD, HbA1c is also requried to maintain below 6.5% to prevent CIN.