Dehydration is one of the most worrisome complications of diarrhea in children. Mild diarrhea usually doesn't cause significant fluid loss, but moderate or severe diarrhea can. Severe dehydration is dangerous; it can cause seizures, brain damage, even death. Know the signs of dehydration.
Cough and cold medications and decongestants may cause the eyes to dilate. In general, any medication that is a stimulant may cause the eyes to dilate. While it's not particularly common, this could include ADHD medications such as Adderall or Ritalin. Of course, certain illegal drugs do this as well, such as cocaine.
Q. Why do doctors dilate your eyes for an exam, and are there any drops to reverse the dilation? A. Doctors use a class of drugs called mydriatics to widen the pupil, enabling them to see the retina and optic nerve. Depending on the drug, mydriatics work by paralyzing the muscle that makes the pupil smaller or by stimulating the muscle that dilates the iris.