Side Effects of Taking Devrom?

Devrom® Side Effects  Include:

Possible darkening of the stool (feces) and/or tongue. This is harmless and temporary. Normal color will return when not taking Devrom.

Devrom is considered safe and effective for use as a nonprescription product. It comes in two forms: chewable tablets and capsules. Both contain 200mg bismuth subgallate. 

Side effects from taking Devrom include a temporary, but harmless, darkening of the stool and or tongue. If this happens, it is a result of the bismuth interacting with the small amounts of sulfur in your digestive system. The combination of bismuth and sulfur forms bismuth sulfide, a black substance that exits the body through bowel movements (black stool).