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twice this week I've woken up with half a black tongue i think it is because of the pepto bismo tablets


It could be. You would not be the only one who had issues with pepto bismol tablets, they can cause black tongue very often. Black tongue generally can vary and causes can be different, but it is very important to observe all those changes that can happen to you.

For example, I would recommend you to stop taking those pills and to see what is going to happen to your tongue. If you see no changes, that means that you should visit your doctor.

If this black tongues starts to fade, that means that nothing is wrong with you.