<p>Gastrointestinal side effects of sodium biphosphate and sodium phosphate have included bloating (31% to 41%), nausea (26% to 30%), abdominal pain (23% to 25%), and vomiting (4% to 9%). Nervous system side effects have included dizziness, headache, and seizures. Renal side effects have included renal impairment, increased blood urea nitrogen (BUN), increased creatinine, acute renal failure, acute phosphate nephropathy, nephrocalcinosis, and renal tubular necrosis. Hypersensitivity reactions reported have included anaphylaxis, rash, pruritus, urticaria, throat tightness, bronchospasm, dyspnea .</p>