Figure 2: A and B: Typical HPLC chromatograms obtained from 20 μl injections of Amlodipine Besylate (2.8 min.) Amlodipine impurity A (3.7 min.), Atorvastatin impurity A (6.6 min.), Atorvastatin Calcium (7.8 min.), Atorvastatin impurity C (8.7 min.) and Amlodipine impurity B (11.7 min.) respectively under optimized chromatographic conditions. A. At 100% conc. Level of all compounds and tablet B. At DL and QL