XPHOZAH (tenapanor hydrochloride)

AbsorptionTenapanor is minimally absorbed following repeated twice daily oral administration. Plasma concentrations of tenapanor were below the limit of quantitation (less than 0.5 ng/mL) in the majority of samples from healthy subjects following single and repeated oral administration of IBSRELA 50 mg twice daily. Therefore, standard pharmacokinetic parameters such as area under the curve (AUC), maximum concentration (C max ), and half-life (t 1/2 ) could not be determined.

DistributionPlasma...

The efficacy of IBSRELA for the treatment of IBS-C was established in two double-blind, placebo-controlled, randomized, multicenter trials in adult patients: Trial 1 (TEN-01-302; NCT02686138) and Trial 2 (TEN-01-301; NCT02621892). The intent-to-treat (ITT) analysis population included 620 patients in Trial 1 and 606 patients in Trial 2 with mean age of 46 years (range 18 to 75 years), 80% females, 64% White and 31% Black/African American. In these clinical trials, IBSRELA was administered immediately prior to breakfast or the first meal of the day and immediately prior to dinner. To enter the ...

Most common adverse reactions (≥2%) are diarrhea, abdominal distension, flatulence and dizziness. ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact Ardelyx at 1-844-427-7352 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch. 6.1 Clinical Trials Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared with rates in the clinical trials of another drug and may not reflect the ra...

IBSRELA is contraindicated in: Patients less than 6 years of age due to the risk of serious dehydration [see Warnings and Precautions (5.1) , Use in Specific Populations (8.4) ]. Patients with known or suspected mechanical gastrointestinal obstruction . Pediatric patients less than 6 years of age. ( 4 , 5.1 , 8.4 ) Patients with known or suspected mechanical gastrointestinal obstruction. ( 4 )

Diarrhea: Patients may experience severe diarrhea. If severe diarrhea occurs, suspend dosing and rehydrate patient. ( 5.2 ) 5.1 Risk of Serious Dehydration in Pediatric Patients IBSRELA is contraindicated in patients below 6 years of age. The safety and effectiveness of IBSRELA in patients less than 18 years of age have not been established. In young juvenile rats (less than 1 week old; approximate human age equivalent of less than 2 years of age), decreased body weight and deaths occurred, pres...

7 DRUG INTERACTIONS OATP2B1 Substrates: Potential for reduced exposure of the concomitant drug (e.g., enalapril). Monitor for signs related to loss of efficacy and adjust the dosage of the concomitantly administered drug as needed. ( 7.1 ) 7.1 OATP2B1 Substrates Tenapanor is an inhibitor of intestinal uptake transporter, OATP2B1 [see Clinical Pharmacology (12.3) ] . Drugs which are substrates of O...