This false-coloured scanning electron micrograph shows crystals of loperamide, an antimotility drug used to treat diarrhea by slowing down the movement of the intestine and reducing the speed at which the contents of the gut pass through. Food remains in the intestines for longer, and water can be more effectively absorbed back into the body. The crystal group measures approximately 250 microns across.

Credit : http://www.fastcodesign.com/1670138/10-of-the-years-most-amazing-science-photos#8