- sevelamer carbonate
POM: Prescription only medicine
This information is intended for use by health professionals
Sevelamer carbonate Genthon 800 mg film-coated tablets
Each tablet contains 800 mg sevelamer carbonate.
Excipients with known effect: each film-coated tablet contains 286.25 mg lactose monohydrate.
For the full list of excipients, see section 6.1.
Oval, white to off-white film-coated tablets (20 mm x 7 mm) without scoring line. The tablets are debossed with 'SVL' on one side.
Sevelamer carbonate Genthon 800 mg film-coated tablets are indicated for the control of hyperphosphataemia in adult patients receiving haemodialysis or peritoneal dialysis.
Sevelamer carbonate Genthon 800 mg film-coated tablets are also indicated for the control of hyperphosphataemia in adult patients with chronic kidney disease not on dialysis with serum phosphorus ≥ 1.78 mmol/l.
Sevelamer carbonate Genthon 800 mg film-coated tablets should be used within the context of a multiple therapeutic approach, which could include calcium supplement, 1,25-dihydroxy Vitamin D3 or one of its analogues to control the development of renal bone disease.
The recommended starting dose of sevelamer carbonate is 2.4 g or 4.8 g per day based on clinical needs and serum phosphorus level. Sevelamer carbonate Genthon 800 mg film-coated tablets must be taken three times per day with meals.
Serum phosphorus level in patients
Total daily dose of sevelamer carbonate to be taken over 3 meals per day
1.78 – 2.42 mmol/l (5.5 – 7.5 mg/dl)
> 2.42 mmol/l (> 7.5 mg/dl)
*Plus subsequent titrating as per instructions
For patients previously on phosphate binders (sevelamer hydrochloride or calcium based), Sevelamer carbonate Genthon 800 mg film-coated tablets should be given on a gram for gram basis with monitoring of serum phosphorus levels to ensure optimal daily doses.
Titration and Maintenance
Serum phosphorus levels must be monitored and the dose of sevelamer carbonate titrated by 0.8 g three times per day (2.4 g/day) increments every 2-4 weeks until an acceptable serum phosphorus level is reached, with regular monitoring thereafter.
Patients taking Sevelamer carbonate Genthon 800 mg film-coated tablets should adhere to their prescribed diets.
In clinical practice, treatment will be continuous based on the need to control serum phosphorus levels and the daily dose is expected to be an average of approximately 6 g per day.
The safety and efficacy of Sevelamer carbonate Genthon 800 mg film-coated tablets has not been established in children below the age of 18 years.
Method of administration
For oral use.
Tablets should be swallowed intact and should not be crushed, chewed, or broken into pieces prior to administration.
• Hypersensitivity to the active substance or to any of the excipients listed in section 6.1.
• Bowel obstruction.
The safety and efficacy of Sevelamer carbonate Genthon 800 mg film-coated tablets have not been established in adult patients with chronic kidney disease not on dialysis with serum phosphorus < 1.78 mmol/l. Therefore Sevelamer carbonate Genthon 800 mg film-coated tablets are currently not recommended for use in these patients.
The safety and efficacy of Sevelamer carbonate Genthon 800 mg film-coated tablets have not been established in patients with the following disorders:
• swallowing disorders
• severe gastrointestinal motility disorders including untreated or severe gastroparesis, retention of gastric contents and abnormal or irregular bowel motion
• active inflammatory bowel disease
• major gastrointestinal tract surgery
Therefore caution should be exercised when Sevelamer carbonate Genthon 800 mg film-coated tablets are used in these patients.
Intestinal obstruction and ileus/subileus
In very rare cases, intestinal obstruction and ileus/subileus have been observed in patients during treatment with sevelamer hydrochloride (capsules/tablets), which contains the same active moiety as sevelamer carbonate. Constipation may be a preceding symptom. Patients who are constipated should be monitored carefully while being treated with Sevelamer carbonate Genthon 800 mg film-coated tablets. Sevelamer carbonate Genthon 800 mg film-coated tablets treatment should be re-evaluated in patients who develop severe constipation or other severe gastrointestinal symptoms.
Patients with CKD may develop low levels of fat-soluble vitamins A, D, E and K, depending on dietary intake and the severity of their disease. It cannot be excluded that Sevelamer carbonate Genthon 800 mg film-coated tablets can bind fat-soluble vitamins contained in ingested food. In patients not taking supplemental vitamins but on sevelamer, serum vitamin A, D, E and K status should be assessed regularly. It is recommended that vitamin supplements be given if necessary. It is recommended that CKD patients not on dialysis are given vitamin D supplements (approximately 400 IU of native vitamin D daily) which can be part of a multivitamin preparation to be taken apart from their dose of Sevelamer carbonate Genthon 800 mg film-coated tablets. In patients undergoing peritoneal dialysis additional monitoring of fat soluble vitamins and folic acid is recommended, since vitamin A, D, E and K levels were not measured in a clinical study in these patients.
There is at present insufficient data to exclude the possibility of folate deficiency during long term Sevelamer carbonate Genthon 800 mg film-coated tablets treatment.
Patients with CKD may develop hypocalcaemia or hypercalcaemia. Sevelamer carbonate Genthon 800 mg film-coated tablets do not contain any calcium. Serum calcium levels should therefore be monitored at regular intervals and elemental calcium should be given as a supplement if required.
Patients with chronic kidney disease are predisposed to developing metabolic acidosis. As part of good clinical practice, monitoring of serum bicarbonate levels is therefore recommended.
Patients receiving dialysis are subject to certain risks for infection specific to dialysis modality. Peritonitis is a known complication in patients receiving peritoneal dialysis and in a clinical study with sevelamer hydrochloride, a greater number of peritonitis cases were reported in the sevelamer group than in the control group. Patients on peritoneal dialysis should be closely monitored to ensure the correct use of appropriate aseptic technique with the prompt recognition and management of any signs and symptoms associated with peritonitis.
Swallowing and choking difficulties
Uncommon reports of difficulty swallowing the Sevelamer carbonate Genthon 800 mg film-coated tablet have been reported. Many of these cases involved patients with co-morbid conditions including swallowing disorders or oesophageal abnormalities. Caution should be exercised when Sevelamer carbonate Genthon 800 mg film-coated tablets are used in patients with difficulty swallowing. The use of Sevelamer carbonate powder for oral suspension in patients with a history of difficulty swallowing should be considered.
Closer monitoring of patients with hypothyroidism co-administered with sevelamer carbonate and levothyroxine is recommended (see section 4.5).
Long-term chronic treatment
In a clinical trial of one year, no evidence of accumulation of sevelamer was seen. However the potential absorption and accumulation of sevelamer during long-term chronic treatment (> one year) cannot be totally excluded (see section 5.2).
Sevelamer carbonate Genthon 800 mg film-coated tablets are not indicated for the control of hyperparathyroidism. In patients with secondary hyperparathyroidism Sevelamer carbonate Genthon 800 mg film-coated tablets should be used within the context of a multiple therapeutic approach, which could include calcium as supplements, 1,25 - dihydroxy Vitamin D3 or one of its analogues to lower the intact parathyroid hormone (iPTH) levels.
Inflammatory Gastrointestinal Disorders
Cases of serious inflammatory disorders of different parts of the gastrointestinal tract (including serious complications such as bleeding, perforation, ulceration, necrosis, colitis, …) associated with the presence of sevelamer crystals have been reported in literature. However, the causality of the sevelamer crystals in initiating such disorders has not been demonstrated. Sevelamer carbonate treatment should be re-evaluated in patients who develop severe gastrointestinal symptoms.
Sevelamer carbonate Genthon 800 mg film-coated tablets contain lactose. Patients with rare hereditary problems of galactose intolerance, the Lapp lactase deficiency or glucose-galactose malabsorption should not take this medicine.
Interaction studies have not been conducted in patients on dialysis.
In interaction studies in healthy volunteers, sevelamer hydrochloride, which contains the same active moiety as in Sevelamer carbonate Genthon 800 mg film-coated tablets, decreased the bioavailability of ciprofloxacin by approximately 50% when co-administered with sevelamer hydrochloride in a single dose study. Consequently, Sevelamer carbonate Genthon 800 mg film-coated tablets should not be taken simultaneously with ciprofloxacin.
Ciclosporin. mycophenolate mofetil and tacrolimus in transplant patients
Reduced levels of ciclosporin, mycophenolate mofetil and tacrolimus have been reported in transplant patients when co-administered with sevelamer hydrochloride without any clinical consequences (i.e. graft rejection). The possibility of an interaction cannot be excluded and a close monitoring of blood concentrations of ciclosporin, mycophenolate mofetil and tacrolimus should be considered during the use of combination and after its withdrawal.
Very rare cases of hypothyroidism have been reported in patients co-administered sevelamer hydrochloride, which contains the same active moiety as sevelamer carbonate, and levothyroxine. Closer monitoring of thyroid stimulating hormone (TSH) levels is therefore recommended in patients receiving sevelamer carbonate and levothyroxine.
Anti-arrhythmics and anti-seizure medicinal products
Patients taking anti-arrhythmic medicinal products for the control of arrhythmias and anti-seizure medicinal products for the control of seizure disorders were excluded from clinical trials. Caution should be exercised when prescribing Sevelamer carbonate Genthon 800 mg film-coated tablets to patients also taking these medicinal products.
Digoxin. warfarin. enalapril or metoprolol
In interaction studies in healthy volunteers, sevelamer hydrochloride, which contains the same active moiety as sevelamer carbonate, had no effect on the bioavailability of digoxin, warfarin, enalapril or metoprolol.
Proton pump inhibitors
During post-marketing experience very rare cases of increased phosphate levels have been reported in patients taking proton pump inhibitors co-administered with sevelamer carbonate.
Sevelamer carbonate Genthon 800 mg film-coated tablets are not absorbed and may affect the bioavailability of other medicinal products. When administering any medicinal product where a reduction in the bioavailability could have a clinically significant effect on safety or efficacy, the medicinal product should be administered at least one hour before or three hours after Sevelamer carbonate Genthon 800 mg film-coated tablets, or the physician should consider monitoring blood levels.
There are no or limited amount of data from the use of sevelamer in pregnant women. Animal studies have shown some reproductive toxicity when sevelamer was administered to rats at high doses (see section 5.3). Sevelamer has also been shown to reduce the absorption of several vitamins including folic acid (see sections 4.4 and 5.3). The potential risk to humans is unknown. Sevelamer carbonate Genthon 800 mg film-coated tablets should only be given to pregnant women if clearly needed and after a careful risk/benefit analysis has been conducted for both the mother and the foetus.
It is unknown whether sevelamer/metabolites are excreted in human milk. The non-absorbed nature of sevelamer indicates that excretion of sevelamer in breast milk is unlikely. A decision on whether to continue/discontinue breast-feeding or to continue/discontinue therapy with Sevelamer carbonate Genthon 800 mg film-coated tablets should be made taking into account the benefit of breast-feeding to the child and the benefit of Sevelamer carbonate Genthon 800 mg film-coated tablets therapy to the woman.
There are no data from the effect of sevelamer on fertility in humans. Studies in animals have shown that sevelamer did not impair fertility in male or female rats at exposures at a human equivalent dose 2 times the maximum clinical trial dose of 13 g/day, based on a comparison of relative body surface area.
Sevelamer has no or negligible influence on the ability to drive and use machines.
Summary of the safety profile
The most frequently occurring (≥ 5% of patients) adverse reactions were all in the gastrointestinal disorders system organ class. Most of these adverse reactions were mild to moderate in intensity.
Tabulated list of adverse reactions
The safety of sevelamer (as either carbonate and hydrochloride salts) has been investigated in numerous clinical trials involving a total of 969 haemodialysis patients with treatment duration of 4 to 50 weeks (724 patients treated with sevelamer hydrochloride and 245 with sevelamer carbonate), 97 peritoneal dialysis patients with treatment duration of 12 weeks (all treated with sevelamer hydrochloride) and 128 patients with CKD not on dialysis with treatment duration of 8 to 12 weeks (79 patients treatment with sevelamer hydrochloride and 49 with sevelamer carbonate).
Adverse reactions that occurred during clinical studies or that were spontaneously reported from postmarketing experience are listed by frequency in the table below.
The reporting rate is classified as very common (≥1/10), common (≥1/100 to <1/10), uncommon (≥1/1,000 to <1/100), rare (≥1/10,000 to <1/1,000), very rare (<1/10,000), not known (cannot be estimated from the available data).
MedDRA System Organ Class
Immune system disorders
Nausea, vomiting, upper abdominal pain, constipation
Diarrhoea, dyspepsia, flatulence, abdominal pain
Intestinal obstruction, ileus/subileus, intestinal perforation
Skin and subcutaneous tissue disorders
Reporting of suspected adverse reactions
Reporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit/risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions via the Yellow Card Scheme (website: www.mhra/gov/uk/yellowcard).
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 undesirable effects. In CKD patients, the maximum average daily dose studied was 14.4 grams of sevelamer carbonate in a single daily dose.
Pharmacotherapeutic group: Treatment of hyperphosphataemia.
ATC code: V03A E02.
Sevelamer carbonate Genthon 800 mg film-coated tablets contain sevelamer, a non-absorbed phosphate binding crosslinked polymer, free of metal and calcium. Sevelamer contains multiple amines separated by one carbon from the polymer backbone which become protonated in the stomach. These protonated amines bind negatively charged ions such as dietary phosphate in the intestine. By binding phosphate in the gastrointestinal tract and decreasing absorption, sevelamer lowers the phosphorus concentration in the serum. Regular monitoring of serum phosphorus levels is always necessary during phosphate binder administration.
In two randomised, cross over clinical studies, sevelamer carbonate in both tablet and powder formulations when administered three times per day has been shown to be therapeutically equivalent to sevelamer hydrochloride and therefore effective in controlling serum phosphorus in CKD patients on haemodialysis.
The first study demonstrated that sevelamer carbonate tablets dosed three times per day was equivalent to sevelamer hydrochloride tablets dosed three times per day in 79 haemodialysis patients treated over two randomised 8 week treatment periods (mean serum phosphorus time-weighted averages were 1.5 ± 0.3 mmol/l for both sevelamer carbonate and sevelamer hydrochloride). The second study demonstrated that sevelamer carbonate powder dosed three times per day was equivalent to sevelamer hydrochloride tablets dosed three times per day in 31 hyperphosphataemic (defined as serum phosphorus levels ≥ 1.78 mmol/l) haemodialysis patients over two randomised 4 week treatment periods (mean serum phosphorus time-weighted averages were 1.6 ± 0.5 mmol/l for sevelamer carbonate powder and 1.7 ± 0.4 mmol/l for sevelamer hydrochloride tablets).
In the clinical studies in haemodialysis patients, sevelamer alone did not have a consistent and clinically significant effect on serum intact parathyroid hormone (iPTH). In a 12 week study involving peritoneal dialysis patients however, similar iPTH reductions were seen compared with patients receiving calcium acetate. In patients with secondary hyperparathyroidism Sevelamer carbonate Genthon 800 mg film-coated tablets should be used within the context of a multiple therapeutic approach, which could include calcium as supplements, 1,25 – dihydroxy Vitamin D3 or one of its analogues to lower the intact parathyroid hormone (iPTH) levels.
Sevelamer has been shown to bind bile acids in vitro and in vivo in experimental animal models. Bile acid binding by ion exchange resins is a well-established method of lowering blood cholesterol. In clinical trials of sevelamer, both the mean total-cholesterol and LDL-cholesterol declined by 15-39%. The decrease in cholesterol has been observed after 2 weeks of treatment and is maintained with long-term treatment. Triglycerides, HDL-cholesterol and albumin levels did not change following sevelamer treatment.
Because sevelamer binds bile acids, it may interfere with the absorption of fat soluble vitamins such as A, D, E and K.
Sevelamer does not contain calcium and decreases the incidence of hypercalcaemic episodes as compared to patients using calcium based phosphate binders alone. The effects of sevelamer on phosphorus and calcium were proven to be maintained throughout a study with one year follow-up. This information was obtained from studies in which sevelamer hydrochloride was used.
Pharmacokinetic studies have not been carried out with sevelamer carbonate. Sevelamer hydrochloride, which contains the same active moiety as sevelamer carbonate, is not absorbed from the gastrointestinal tract, as confirmed by an absorption study in healthy volunteers.
Non-clinical data with sevelamer reveal no special hazard for humans based on conventional studies of safety pharmacology, repeated dose toxicity or genotoxicity.
Carcinogenicity studies with oral sevelamer hydrochloride were conducted in mice (doses of up to 9 g/kg/day) and rats (0.3, 1, or 3 g/kg/day). There was an increased incidence of urinary bladder transitional cell papilloma in male rats of the high dose group (human equivalent dose twice the maximum clinical trial dose of 14.4 g). There was no increased incidence of tumors observed in mice (human equivalent dose 3 times the maximum clinical trial dose).
In an in vitro mammalian cytogenetic test with metabolic activation, sevelamer hydrochloride caused a statistically significant increase in the number of structural chromosome aberrations. Sevelamer hydrochloride was not mutagenic in the Ames bacterial mutation assay.
In rats and dogs, sevelamer reduced absorption of fat soluble vitamins D, E and K (coagulation factors), and folic acid.
Deficits in skeletal ossification were observed in several locations in foetuses of female rats dosed with sevelamer at intermediate and high doses (human equivalent dose less than the maximum clinical trial dose of 14.4 g). The effects may be secondary to vitamin D depletion.
In pregnant rabbits given oral doses of sevelamer hydrochloride by gavage during organogenesis, an increase of early resorptions occurred in the high-dose group (human equivalent dose twice the maximum clinical trial dose).
Sevelamer hydrochloride did not impair the fertility of male or female rats in a dietary administration study in which the females were treated from 14 days prior to mating through gestation and the males were treated for 28 days prior to mating. The highest dose in this study was 4.5 g/kg/day (human equivalent dose 2 times the maximum clinical trial dose of 13 g/day, based on a comparison of relative body surface area).
Silica, colloidal anhydrous
No special storage conditions.
HDPE bottles with a polypropylene cap containing 180, 200 or 210 tablets per bottle (with and without outer carton)
Multipack containing two bottles with 180, 200 or 210 tablets per bottle (two bottles in one outer carton)
Multipack containing three bottles with 180, 200 or 210 tablets per bottle (three bottles in one outer carton)
The HDPE bottles contain a desiccant.
Not all pack sizes may be marketed.
No special requirements.
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