SAN FRANCISCO--(BUSINESS WIRE)--Napo Pharmaceuticals, Inc. (“Napo”) announced today that, on November 4, 2011, it terminated its Collaboration Agreement with Salix Pharmaceuticals, Inc. (“Salix”) dated December 9, 2008 (the “Collaboration Agreement”) to commercially develop its first in class novel drug compound, crofelemer. The compound is a treatment for diarrhea, a life-threatening ailment that impacts millions of people across the world.