I took Miralax for 2 weeks without any side effects. It softened my stool beautifully and I was regular. Then I switched to LaxaClear (Costco's generic version) and have been on that for 5 weeks. But this past week I have felt very constipated and had very few BMs and suffered with severe bloating, burping and even acid reflux at night (none of which are common for me). So, I have been fasting on clear liquids for 2 days and now am finally feeling better (though hungry). I may just switch to prune juice!