What will happen if i take pepto bismol (bismuth subsalicylate) for more than the 2 days it recommends?

Aspirin Toxicity: Pepto bismol (bismuth subsalicylate) can cause some Aspirin like effects such as easy bleeding or bruising (though this is quite rare), ringing of the ears, and eventual stomach irritation. Pepto bismol (bismuth subsalicylate) will turn your stools black and can do the same to your tongue as well. The warning is on there because ongoing diarrhea is a sign you should seek medical attention and not continue simply taking over the counter medicine.