Delayed intestinal absorption of other medicines taken concurrently eg, minerals (Ca, Fe, lithium, Zn), vit (vit B
12), cardiac glycosides, coumarins, carbamazepine. Weakened effects of thyroid hormone. Intestinal obstruction may occur w/ medicines that inhibit the natural bowel movement (eg, loperamide, opium tinct). Adjustment of anti-diabetic therapy may be necessary.