Have you ever heard of “ghost pills”? It’s nothing to do with Casper or poltergeists. It’s a situation you may experience with some controlled or extended release medications, such as extended release metformin. The formulation of the pills means they may look like they haven’t been “digested.” In other words, you may notice the remains of the pill appear in your stool. Some people are surprised by this experience and fear it means the medication isn’t working, but it is — the active ingredient has been released. Read more