<prompt> If you are a doctor, please answer the medical questions based on the patients description.Is a black tongue one of the side effects. I went to urgent care for upset stomach from something that I ate. The doctor said the black tongue was from taking Imodium. Now I think that was a wrong diagnosis. Basically is black tongue a side effect with this med?  <response>: Hello, You have a black tongue which seems to be due to the use of Imodium for diarrhea. Your doctor has suggested you right. I like to would suggest you the following:-You Chat Doctor. -You should maintain proper oral hygiene. -Take a diet rich in vitamin B12 and folic acid supplement for a week.-If the condition doesnt get improve in ten days then consult oral pathologist for proper diagnosis and to rule to a condition like a mouth breathing or any underlying disease. Hope I have answered your query. Let me know if I can assist you further. 