That makes sense. The doctor told me to use it every 8 hours for 2 days, so this morning was the last dose. If the hives return, we will go to the doctor. Fortunately Ava doesn't have any respiratory symptoms only GI (obviously I know her lungs aren't "normal"), so hopefully it won't have any adverse effects on her. She also has to have her h1n1 booster today <img src="i/expressions/face-icon-small-sad.gif" border="0"> That's freaking me out as well...........