I've never heard of any toxic effects from the use of Daconil but always make sure you wash your toms thoroughly before eating. Daconil is also a preventative measure and would have limited success on plants already infected. This of course depends heavily on what is affecting your plants. Post pictures of the problem for identification.

I have a couple of Heirlooms with early blight and I got the spray for that. This is the first time I have tried using Daconil. I also have a plant with tomato wilt virus, which I know the fungicide will not control, unfortunately.Thanks for responding.