Question: what happens when you take too much miralax?
Answer: Diarrhea or loose stools are side effects of MiraLAX. Diarrhea is more likely to happen if you take more than the recommended dosage. Seniors also have a higher risk of diarrhea. In one study, about 11 percent of those taking MiraLAX for chronic constipation had diarrhea as a side effect.