Ardelyx up 16% as FDA releases briefing docs on tenapanor for continual kidney illness

Shares of Ardelyx (NASDAQ:ARDX) are up 16% in Monday morning buying and selling as US FDA advisory committee briefing paperwork have been launched prematurely of a Wednesday’s assembly to debate tenapanor for management of serum phosphorus ranges in continual kidney illness (CKD).

Regardless of the surge, FDA reviewers have expressed considerations that the magnitude of the impact of tenapanor might not be a major enchancment over present medicine for the situation.

Ardelyx (ARDX) submitted three research as a part of their software. Two have been tenapanor as monotherapy, whereas the third was with the drug + an current phosphate-binder therapy.

The FDA workforce mentioned that analyses based mostly on the intent-to-treat inhabitants in the course of the 4-week randomized withdrawal interval from the 2 monotherapy trials “offered maybe the perfect estimates of the typical therapy impact within the subset of sufferers which might be more likely to tolerate tenapanor and stay on remedy.”

Nevertheless, “the magnitude of the imply therapy impact on this inhabitants (−0.7 mg/dL in each research) seemed to be lower than that noticed with authorized brokers (~1.5 to 2.2 mg/dL).” The imply therapy impact within the mixture trial was additionally −0.7 mg/dL.

Within the draft factors for consideration part, the doc notes that though the FDA has not mandated that candidates present a therapy impact bigger than some threshold, “it has indicated that the magnitude of the therapy impact must be clinically related. It has additionally acknowledged that if the magnitude of the impact is considerably smaller than that of at present authorized merchandise, then candidates ought to tackle the scientific relevance.”

Tenapanor is already authorized beneath the identify Ibsrela for irritable bowel syndrome with constipation.

In 2021, the FDA issued a Full Response Letter for temapanor within the CKD indication. Following an attraction, the company issued an Enchantment Denied letter in February.