I am prescribed Metformin ER 500 mg (2,500 mg total daily intake, 2 in morning 3 in afternoon) for diabetes, Effexor 75 mg, Simvastatin 20 mg, Ambien 10 mg, Women s 50+ multivatamin, Super B-Comlex vitamin, 500+D Oscal and I take a baby aspirin every day. Can I combine this medication when I take them or should certain drugs not be mixed? My last cholesterol check this January was 83. Is 2,500 mg. per day considered excessive?