<h2>Devrom® (bismuth subgallate) Side Effects Include:</h2> <h3>Possible darkening of the stool (feces) and/or tongue. This is harmless and temporary. Normal color will return when not taking Devrom.</h3> <p>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. </p> <p><strong>Side effects</strong> 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).</p> <p> </p>