- Use of medications that alter GI motility e.g., narcotics, medications with significant anticholinergic effects, CYP-450 3A4 inhibitors, antibiotics (other than the experimental drug erythromycin), pramlintide or GLP-1 based therapy. Subjects using metoclopramide or erythromycin will be enrolled but these medications will be held for 7 days before CGM1 and GE1