Iterum Therapeutics Receives Complete Response Letter from U.S. Food and Drug Administration for Oral Sulopenem

Iterum Therapeutics plc (Nasdaq: ITRM) (the “Company”), a clinical-stage pharmaceutical company focused on developing next generation oral and IV antibiotics to treat infections caused by multi-drug resistant pathogens in both community and hospital settings, today announced that it received a Complete Response Letter (CRL) from the U.S. Food and Drug Administration (FDA) for its New Drug Application (NDA) for sulopenem etzadroxil/probenecid (oral sulopenem) on July 23, 2021. The CRL provided that the FDA has completed its review of the NDA and has determined that it cannot approve the NDA in its present form.

In the CRL, the FDA acknowledged that the Phase 3 SURE-1 clinical trial demonstrated statistical significance in difference in overall response rate of oral sulopenem compared to ciprofloxacin in the ciprofloxacin-resistant population. However, the FDA determined that additional data are necessary to support approval for the treatment of adult women with uncomplicated urinary tract infections caused by designated susceptible microorganisms proven or strongly suspected to be non-susceptible to a quinolone. The FDA recommended that Iterum conduct at least one additional adequate and well-controlled clinical trial, potentially using a different comparator drug. Additionally, the FDA recommended that Iterum conduct further nonclinical investigation to determine the optimal dosing regimen, although the FDA stated that this recommendation does not raise an approvability issue. The FDA indicated its willingness to work with Iterum on the design of the clinical trial(s) to address the deficiencies noted.

There were no chemistry, manufacturing or controls (CMC) issues identified in the CRL, nor were there any safety issues found in over 1,800 patients treated with sulopenem across the Company’s clinical development program.

“We are disappointed in this outcome and believe that the data package submitted was adequate for the approval of oral sulopenem,” said Corey Fishman, Chief Executive Officer.  “Regardless, we will evaluate the points raised in the CRL for discussion with the FDA to determine an expeditious path forward. We remain confident in the value of, and unmet medical need for, oral sulopenem to treat multi-drug resistant infections, including fast-growing quinolone non-susceptible pathogens.”

Iterum intends to review the CRL with its advisors and plans to request a Type A meeting in the coming weeks. Following the Type A meeting, anticipated to be late in the third quarter, Iterum expects to provide an update on next steps as to the potential additional clinical and non-clinical work to be done prior to a resubmission of the NDA for approval of oral sulopenem.

Iterum notes that cash, cash equivalents and short-term investments were $100.5 million at the end of the first quarter of 2021. Based on the current operating plan and subject to final determination of the design and planned conduct of additional clinical and potential nonclinical development for sulopenem, the Company believes that it is well positioned financially to fund its operations into the second half of 2023.

About Iterum Therapeutics plc

Iterum Therapeutics plc is a clinical-stage pharmaceutical company dedicated to developing differentiated anti-infectives aimed at combatting the global crisis of multi-drug resistant pathogens to significantly improve the lives of people affected by serious and life-threatening diseases around the world. Iterum Therapeutics is advancing its first compound, sulopenem, a novel penem anti-infective compound, in Phase 3 clinical development with an oral formulation and IV formulation. Sulopenem has demonstrated potent in vitro activity against a wide variety of gram-negative, gram-positive and anaerobic bacteria resistant to other antibiotics. Iterum Therapeutics has received Qualified Infectious Disease Product (QIDP) and Fast Track designations for its oral and IV formulations of sulopenem in seven indications.