The article presents a review of current European and Russian guidelines on diagnostics and treatment of exocrine pancreatic insufficiency in patients with chronic pancreatitis. Results of our own comparative study on treatment of 55 chronic pancreatitis patients with low and adequate doses of pancreatic enzyme replacement therapy (PERT) confirm the need for usage of recommended doses of modern micronized polyenzyme drugs since it improves both clinical manifestation and nutritional status in such patients unlike the lower doses. Our research findings show that the optimal criterium for PERT efficacy assessment is the normalization of antropometric and biochemical nutritional markers.