Which potential adverse effect of gabapentin should be reported if experienced?

• A. Restlessness.
• B. Tarry stool.
• C. Dry mouth.
• D. Flatulence.

Answer: (B)

The main idea here is recognizing signs that indicate a potentially serious adverse effect and must be reported promptly. Tarry stools, which are dark, tar-like stools caused by digested blood, point to possible GI bleeding. In a patient taking gabapentin, this is a red flag because GI bleeding can signal ulcers, gastritis, or other serious problems that need urgent assessment and intervention. Because older adults may have higher risk for complications, any new black or tarry stools should be reported to a clinician right away, even if other side effects from gabapentin seem mild.

Other options are less urgent. Restlessness can occur with various meds but isn’t a unmistakable warning sign of a life-threatening issue. Dry mouth is a common but usually non-threatening side effect. Flatulence is generally benign. The critical action with tarry stool is to seek medical evaluation promptly to rule out bleeding and address any underlying cause.