I was not seeing any signs of black stools before taking the medicine and I am not taking any other medications. I have had a chest cold almost a week.
This is not a usual side effect for Mucinex. You need to make an appt to see your primary care doc. There is a test they can do to see if there is blood in the stools. Black stools can be a sign of a bleed somewhere in the digestive tract. Kaismama is right that iron can give you dark looking stools and so can Pepto-Bismol. If there is bleeding somewhere in the digestive tract, it is nothing to mess with so see your doc as soon as possible.
- Mucinex Information for Consumers
- Mucinex Information for Healthcare Professionals (includes dosage details)
- Side Effects of Mucinex (detailed)
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