Yes, this is completely normal and very common. Autrin is an iron supplement, and when your body processes oral iron, the unabsorbed portion is excreted in your stool, turning it a dark green or black color. This is a harmless side effect and actually shows that the medication is in your system. There is no need to worry unless you also experience severe abdominal pain, fever, or blood in your stool. Please continue taking your capsules as prescribed by your doctor and drink plenty of water. If you feel any discomfort, do consult your doctor.
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Is it normal to have black poop after taking an Autrin capsule at night?