This medication is used to treat occasional constipation. Some medications and conditions can make constipation more likely. Stool softeners such as docusate are often the first method used for preventing and treating this type of constipation. Docusate is often used when straining to have a bowel movement should be avoided (such as after a heart attack or surgery).Docusate is a stool softener. It works by increasing the amount of water the stool absorbs in the gut, making the stool softer and easier to pass.Check the ingredients on the label even if you have used the product before. The manufacturer may have changed the ingredients. Also, products with similar names may contain different ingredients meant for different purposes. Taking the wrong product could harm you.