The secretion of bioactive products by tumors of the gastroenteropancreatic system results in the development of watery diarrhea that can lead to death in a very short period if not brought under control. Even if the consequences are less dramatic, the patients' ability to lead a normal daily life is seriously impaired, and they may become severely depressed. SandostatinR alleviates the condition by inhibiting peptide release, and its long duration of action makes it an effective and rational adjunct to therapy at all stages. Last year a consensus Round Table Meeting was held in Scottsdale, Arizona, to discuss the optimal use of SandostatinR in this indication. These guidelines offer the results of clinical research and the dosage recommendations arising from them, together with a critical summary of the points of view presented.