Phoscut 800 Sevelamer Carbonate 800 mg Tablet

Description:

The active ingredient in Phoscut is sevelamer carbonate, a polymeric amine that binds phosphate and is meant for oral administration. Sevelamer carbonate is an anion exchange resin, with the same polymeric structure as sevelamer hydrochloride, in which carbonate replaces chloride as the counter ion. While the counter ions differ for the two salts, the polymer itself, the active moiety involved in phosphate binding, is the same.

Sevelamer carbonate is known chemically as poly(allylamine-co-N,N'-diallyl-1,3 diamino-2-

hydroxypropane) carbonate salt. Sevelamer carbonate is hygroscopic, but insoluble in water.

Pharmacology:

Patients with CKD retain phosphorus and can develop Hyperphosphatemia. When the product of serum calcium and phosphorus concentrations (Ca*P) surpasses 55 mg/dL, there is an increased risk that ectopic calcification will occur. Hyperphosphatemia plays a role in the development of secondary hyperparathyroidism in renal insufficiency.

Management of Hyperphosphatemia includes Diet, Dialysis and use of Phosphate Binders. Sevelamer carbonate taken with meals has been shown to control serum phosphorus concentrations in patients with CKD who are on dialysis.

Mechanism of Action:

Phoscut contains 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 backbone. These amines exist in a protonated form in the intestine and interact with phosphate molecules through ionic and hydrogen bonding. By binding phosphate in the gastrointestinal tract and decreasing absorption, Sevelamer carbonate lowers the phosphate concentration in the serum (serum phosphorus).

Drug Interactions:

It may develop drug interaction with the following drug

Ciprofloxacin

Digoxin

Warfarin

Enalapril

Metoprolol

Iron

Overdosage:

Sevelamer hydrochloride, which contains the same active moiety as sevelamer carbonate, has been given to normal healthy volunteers in doses of up to 14 grams per day for eight days with no adverse effects. In CKD patients on dialysis, the maximum dose studied was 14 grams of sevelamer carbonate and 13 grams of sevelamer hydrochloride. There are no reports of overdosage with sevelamer carbonate or sevelamer hydrochloride in patients.

Contraindications:

Phoscut is contraindicated in patients with bowel obstructions.

Warnings & Precautions:

Serious cases of dysphagia, bowel instruction, and perforation have been associated with Sevelamer use some requiring hospitalization and surgery.

Adverse reactions:

Sevelamer carbonate may cause constipation ,if left untreated it may lead to severe complications. Patients should be cautioned to report new onset or worsening of existing constipation promptly to their physician.

Indication & usage:

Phoscut (Sevelamer Carbonate 400/800 mg) is a phosphate binder indicated in Hyperphosphatemia for the control of serum phosphorus in patients with Chronic Kidney Disease on dialysis.

Dosage & administration:

Patient must take Phoscut three times a day with meals.