Not to be taken at bedtime or before arising for the day. May cause local irritation of upper GI mucosa. Reports of esophagitis, esophageal ulcers & erosions, bleeding (occasionally) & esophageal stricture (rarely). Discontinue use if dysphagia, odynophagia, retrosternal pain or new or worsening heartburn develop. Patients w/ active upper GI problems eg, dysphagia, esophageal diseases, gastritis, duodenitis or ulcers. Correct hypocalcemia & treat other disturbances of mineral metabolism (eg, vit D deficiency) prior to initiating therapy. Ensure adequate Ca & vit D intake in patients w/ Paget's disease of bone & those receiving glucocorticoids. Not recommended in patients w/ severe renal insufficiency (CrCl <35 mL/min). No studies in pregnant women; use in pregnancy only if potential benefit justifies potential risk to mother & fetus. Caution to nursing women. Safety & effectiveness in ped patients have not been established.