Not recommended in adults w/ CKD not on dialysis w/ serum P <1.78 mmol/L. Dysphagia swallowing disorders, severe GI motility disorder including untreated or severe gastroparesis, retention of gastric contents & abnormal or irregular bowel motion. Active inflammatory bowel disease, major GIT surgery. Intestinal obstruction & ileus/subileus. Assess vit A, D, E, & K regularly. Folate deficiency. Monitor serum Ca levels & serum bicarbonate at regular interval. Peritonitis. Patients taking anti-arrhythmias & anti-seizures. Hypothyroidism. Long-term chronic treatment (>1 yr). Not indicated for the control of hyperparathyroidism. Avoid in patients w/ galactose intolerance, the Lapp lactase deficiency or glucose-galactose malabsorption. Pregnancy & lactation. Childn <18 yr.