I am 90 years old, have had a heart bypass and been taking Simvastatin, 40mg for many years. For the past 5 years I have had marginal kidney function making further angiograms problematic. Recently my cardiologist prescribed amlodipine, 5 mg. ( I also take isosorbide mononitrate, 60mg, Lisinopril, 5 mg, Lopressor 100 mg, and Hydroclorathiazide, 12.5 mg) Should I be concerned about the interaction of the Amlodipine with the Simvastatin?