A 46-year-old woman has diarrhea with abdominal distension, loss of body mass, and large amounts of porridge-like foul smelling stool without blood streaks or tenesmus. Objective examination detects moderate tenderness in the mesogastrium and left abdominal flank. Stool analysis detects steatorrhea with neutral fat and creatorrhea. What prescription would be the most advisable in this case?