EntocortĀ®EC (budesonide) Capsules
CLINICAL PHARMACOLOGY
Budesonide has a high topical glucocorticosteroid (GCS) activity and a substantial first pass elimination. The formulation contains granules which are coated to protect dissolution in gastric juice, but which dissolve at pH >5.5, ie, normally when the granules reach the duodenum. Thereafter, a matrix of ethylcellulose with budesonide controls the release of the drug into the intestinal lumen in a time-dependent manner.
The duodenum is the first section of the small intestine.
Source Page 2 of:
www.accessdata.fda.gov/drugsatfda_docs/label/2009/021324s008lbl.pdf