Ardelyx Bets Big On Tenapanor’s Potential, Despite Side Effect Concerns

Unwinding NHE3 partnership with AstraZeneca, Ardelyx plans to move first-in-class agent into Phase III in IBS-C while seeking more tolerable dosing regimen for late-stage development in hyperphosphatasia.

Ardelyx Inc. is wagering up to $90 million that it can bring first-in-class NHE3 inhibitor tenapanor to market on its own despite side-effect concerns seen in a Phase IIb trial for hyperphosphatasia in end-stage renal disease patients on dialysis.

The California biotech is paying $15 million up front to unravel a 2012 partnership with AstraZeneca PLC around tenapanor,...

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