It is possible for Elavil to cause black stools because it contains iron in its composition, which can cause black stools. Other foods like animal blood and medications such as bismuth and toner can also cause black stools. The black stools caused by the above-mentioned foods and drugs do not have a special odor, but if the black stools are caused by gastrointestinal bleeding, they often show a fishy odor, and a particularly obvious bloody odor, so we should pay attention to the identification. For black stools caused by gastrointestinal bleeding, there will also be abdominal pain, bloating, dizziness, weakness and other discomfort. The main purpose of this is to prevent anemia caused by iron and folic acid deficiency during pregnancy. If it is confirmed that the black stool appears due to taking Aleve, it does not need to be treated and can be relieved by itself.