Why BLOCK?

Why BLOCK?

In patients with CKD on dialysis

Despite best efforts with diet, dialysis, and phosphate binder therapy, consistently achieving guideline-established target serum phosphorus levels has been a longtime challenge1

42%

of patients are unable to achieve target serum phosphorus levels in any given month2

77%

of patients are unable to consistently achieve and maintain target serum phosphorus levels over a 6-month period2*

Demonstrated in a 2019 chart audit including the records of 1015 patients on dialysis, 843 of whom were on phosphate-lowering therapy, submitted by 159 nephrologists. Target serum phosphorus levels were defined as ≤5.5 mg/dL.2

*At least one serum phosphorus level was >5.5 mg/dL in the 6-month evaluation period.

Phosphate absorption

Our knowledge has advanced. We now know that the paracellular pathway is the primary pathway by which phosphate absorption occurs2

Paracellular phosphate absorption occurs passively along concentration gradients through tight junction complexes between epithelial cells.1,3,4

The paracellular pathway is responsible for the bulk of dietary phosphate absorption and does not appear to saturate.1,3,4

Graphic of phosphate absorption through the paracellular pathway

Pinch to Zoom

It’s time to consider the role of the paracellular pathway in the management of hyperphosphatemia

Videos

Hear from leaders in the field

Play VideoDr. Stuart Sprague

Dr. Stuart Sprague

Watch Dr. Stuart Sprague describe our new mechanistic understanding of phosphate absorption.

Play VideoDr. Glenn Chertow

Dr. Glenn Chertow

Watch Dr. Glenn Chertow explain how we may be underestimating the portion of patients with uncontrolled hyperphospatemia.

Dr. Sprague and Dr. Chertow are compensated advisors to Ardelyx.

RELATED LINKS

Mechanism of Action

REFERENCES

1.

Fishbane SN, Nigwekar S. Phosphate absorption and hyperphosphatemia management in kidney disease: a physiology-based review. Kidney Med. 2021;3(6):1057-1064.

2.

Robinson J, Hurtado T. The true state of hyperphosphatemia management in dialysis. ePoster presented at: American Society of Nephrology (ASN) Kidney Week 2020; October 22–25, 2020.

3.

Fouque D, Vervloet M, Ketteler M. Targeting gastrointestinal transport proteins to control hyperphosphatemia in chronic kidney disease. Drugs. 2018;78(12):1171-1186.

4.

Saurette M, Alexander RT. Intestinal phosphate absorption: the paracellular pathway predominates? Exp Biol Med (Maywood). 2019;244(8):646-654.

Indication

XPHOZAH (tenapanor) 30 mg BID is indicated to reduce serum phosphorus in adults with chronic kidney disease (CKD) on dialysis as add-on therapy in patients who have an inadequate response to phosphate binders or who are intolerant of any dose of phosphate binder therapy.

Important Safety Information

Contraindications

XPHOZAH is contraindicated in:

  • Pediatric patients under 6 years of age
  • Patients with known or suspected mechanical gastrointestinal obstruction

Warnings and precautions

Diarrhea

Patients may experience severe diarrhea. Treatment with XPHOZAH should be discontinued in patients who develop severe diarrhea.

Most Common Adverse Reactions

Diarrhea, which occurred in 43-53% of patients, was the only adverse reaction reported in at least 5% of XPHOZAH-treated patients with CKD on dialysis across trials. The majority of diarrhea events in XPHOZAH-treated patients were reported to be mild-to-moderate in severity and resolved over time, or with dose reduction. Diarrhea was typically reported soon after initiation but could occur at any time during treatment with XPHOZAH. Severe diarrhea was reported in 5% of XPHOZAH-treated patients in these trials.

For additional safety information, please see full Prescribing Information.

Indication

XPHOZAH (tenapanor) 30 mg BID is indicated to reduce serum phosphorus in adults with chronic kidney disease (CKD) on dialysis as add-on therapy in patients who have an inadequate response to phosphate binders or who are intolerant of any dose of phosphate binder therapy.

Important Safety Information

Contraindications

XPHOZAH is contraindicated in:

  • Pediatric patients under 6 years of age
  • Patients with known or suspected mechanical gastrointestinal obstruction

Warnings and precautions

Diarrhea

Patients may experience severe diarrhea. Treatment with XPHOZAH should be discontinued in patients who develop severe diarrhea.

Most Common Adverse Reactions

Diarrhea, which occurred in 43-53% of patients, was the only adverse reaction reported in at least 5% of XPHOZAH-treated patients with CKD on dialysis across trials. The majority of diarrhea events in XPHOZAH-treated patients were reported to be mild-to-moderate in severity and resolved over time, or with dose reduction. Diarrhea was typically reported soon after initiation but could occur at any time during treatment with XPHOZAH. Severe diarrhea was reported in 5% of XPHOZAH-treated patients in these trials.

For additional safety information, please see full Prescribing Information.

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