Management of Capecitabine-Induced Diarrhea

Immediate Management

The American Society of Clinical Oncology recommends loperamide as the first-line agent for capecitabine-induced diarrhea, which can be started immediately, even before stool culture results are available 1, 2
The initial dose of loperamide is 4 mg, followed by 2 mg every 2-4 hours or after each unformed stool, with a maximum daily dose of 16 mg 1, 3
Lomotil (diphenoxylate/atropine) is not recommended due to historical evidence showing adverse outcomes with this fixed-dose combination in infectious diarrhea 4

Patients with grade 2 or higher diarrhea (4-6 stools/day or nocturnal stools) require immediate interruption of capecitabine 2, 5
It is essential to rule out C. difficile infection, especially if the patient is neutropenic, and to monitor for severe toxicity 2, 5

If loperamide fails, octreotide should be initiated at a dose of 100-150 mcg subcutaneously or intravenously three times daily, which can be titrated up to 500 mcg three times daily or 25-50 mcg/hour by continuous IV infusion 1, 3
Oral budesonide (9 mg once daily) may be considered for refractory chemotherapy-induced diarrhea 1

Aggressive fluid resuscitation is essential if the patient shows signs of dehydration, with an initial bolus of 20 mL/kg if tachycardic or potentially septic 1
Target urine output should be >0.5 mL/kg/hour with adequate central venous pressure, and electrolyte monitoring is critical, particularly for hypokalemia 1, 6
Patients should avoid spices, coffee, and alcohol, and consider lactose avoidance during active chemotherapy-induced diarrhea 1, 6