I agree with tigerlilly5909 that these products should probably not be taken at the same time. If you are going to take them both, I'd strongly suggest that you separate them by a few hours. Be very careful of any products that may raise your heart rate/blood pressure too much. But as tigerlilly said -- you should talk to your doctor about any supplements you are taking.
We don't really advocate the use of diet aides, preferring to accomplish weight loss by means of changing our life styles to include a sensible diet and exercise plan. We would be more than happy to help you out with that. Just let us know how much you want/need to lose and give us a bit of info regarding your current diet and exercise.
I definitely would not take the Mega-T and One A Day-Energy together. The Mega-T has a lot of caffeine in it and the Guarana that is in the One A Day-Energy vitamin has about twice the caffeine as a coffee bean. They both have too much caffeine in them and then to double up I'm sure is not good. I would definitely run it by your doctor. I think he'll tell you the same. As for the Nexium being combined it only says that you should tell your doctor about any prescription or non prescription meds your taking.
I've never taken a diet aide but I've lost over 60 pounds in the last 8 months with diet and exercise. How much weight do you have to lose? Maybe we can help. I can answer food and exercise questions a little easier. Let us know if we can help.