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Hi Debbye, Coreg CR contains the same active ingredient as Coreg, which is carvedilol, and they both belong the class of blood pressure lowering medications called an ACE inhibitor. The difference between the 2 medications is the fact that they have different durations of action. Coreg CR lasts longer in the body then regular Coreg does, which means that patients only have to take the CR version once a day compared to twice a day with the regular Coreg. Neither medication contains Lasix. Only your doctor knows why he decided to switch your medications, and I'm sure he would be more then willing to give you an explaination if you were to ask. Thanks for your question! Jill