Phathom Pharmaceuticals Announces Submission of Six-Month Stability Data in Support of Erosive GERD New Drug Application

• Six-month stability data remain more than 10x below the acceptable intake limit set by the U.S. Food and Drug Administration (FDA) and continue to support the requested product shelf life
  
  
• Submission of six-month stability data satisfies Phathom's stability data submission requirements for Erosive GERD New Drug Application (NDA) for vonoprazan with a Prescription Drug User Fee Act (PDUFA) goal date of November 17, 2023
  

FLORHAM PARK, N.J., Aug. 21, 2023 (GLOBE NEWSWIRE) -- Phathom Pharmaceuticals, Inc. (Nasdaq: PHAT), a biopharmaceutical company focused on developing and commercializing novel treatments for gastrointestinal diseases, today announced it has submitted to the FDA six-month stability data from its long-term and accelerated stability program for its reformulated vonoprazan tablets. The additional stability was required for the FDA to complete its NDA review for vonoprazan, a novel first-in-class potassium-competitive acid blocker (PCAB), for the treatment of Erosive GERD (gastroesophageal reflux disease), also referred to as erosive esophagitis.

With the submission of these data, Phathom has satisfied the FDA’s request for additional data in response to the Complete Response Letter (CRL) issued in February 2023 relating to specifications and controls for a nitrosamine drug substance related impurity, N-nitroso-vonoprazan (NVP). Phathom resubmitted the NDA for vonoprazan for Erosive GERD in May 2023 on the basis of three months of stability data and was assigned a PDUFA goal date of November 17, 2023.

“We are happy to share that the six-month stability data continue to demonstrate effective control of NVP, which is another big step forward as we prepare for a planned launch in the fourth quarter of this year,” said Terrie Curran, President and Chief Executive Officer of Phathom. “The latest stability data confirm that our minor product reformulation has limited the presence of NVP, and we believe these data comfortably support the proposed shelf life for vonoprazan tablets. We look forward to working with the FDA as it completes its review.”

The long-term and accelerated six-month data from Phathom’s stability program have demonstrated that the minor drug product tablet reformulation is controlling NVP growth through six months and keeping levels greater than tenfold below the acceptable daily intake limit of 96 ng/day or 2.4 ppm based on the maximum approved daily dose of 40 mg/day.