Medications that interfere with gastrointestinal motility:
(1) opiates (methadone, etc)
(2) anticholinergic drugs
(3) calcium channel blockers
(4) certain antacids
(5) oral iron preparations
Other ingested materials:
(1) barium contrast agents
(2) bezoars
(3) diet (inadequate fiber and insufficient fluids)
Conditions associated with chronic constipation:
(1) anatomic disorders
(2) neurogenic disorders (Hirschsprung’s etc)
(3) metabolic disorders and debilitation
Anatomic anorectal disorders:
(1) megarectum (Chaga’s disease, other)
(2) anorectal stenosis
(3) tumor
Functional anorectal disorder:
(1) increased rectal compliance
(2) abnormalities of rectal sensation
