The following serious adverse reactions are described below and elsewhere in labeling: Acute Tubulointerstitial Nephritis Clostridium difficile -Associated Diarrhea Bone Fracture Severe Cutaneous Adverse Reactions Cutaneous and Systemic Lupus Erythematosus Cyanocobalamin (Vitamin B12) Deficiency Hypomagnesemia and Mineral Metabolism Fundic Gland Polyps Risk of Heart Valve Thickening in Pediatric Patients Less than Two Years of Age The most common adverse reactions are: Adults (≥2%): diarrhea, abdominal pain, nausea, upper respiratory tract infection, vomiting, and flatulence. Patients 12 to 17 years of age (≥5%): headache, abdominal pain, diarrhea, nasopharyngitis, and oropharyngeal pain.