My difficult child does seem to be doing better on the Prozac, but now his heart is racing again. I put my hand on his chest this a.m. and could feel how hard it was beating. He had just gotten up and put on his clothes, so he was not doing vigorous activity. He stayed home yesterday due to a stomache ache. He had these symptoms with-Zoloft and missed a lot of school. I was all set to take him off the Prozac last wk, but then the symptoms went away. Now they are back. I don't know how long to put up with-this, and whether these side effects will go away.