<p>Sevelamer carbonate, a non-absorbed phosphate binding crosslinked polymer, free of metal and calcium. It contains multiple amines separated by one carbon from the polymer&nbsp;backbone. These amines exist in a protonated form in the intestine and interact with phosphate molecules through ionic and&nbsp;hydrogen&nbsp;bonding. By binding phosphate in the&nbsp;gastrointestinal tract&nbsp;and decreasing absorption, sevelamer carbonate lowers the phosphate concentration in the serum (serum&nbsp;phosphorus).</p>