Skip to Content


Treatment for Diarrhea

Update: Fulyzaq (crofelemer) Now FDA Approved - December 31, 2012

Napo Comments on FDA Announcing Extension of Crofelemer NDA Priority Review

SAN FRANCISCO--(BUSINESS WIRE)--May 3, 2012 - Napo Pharmaceuticals, Inc. (Napo) has been informed that the U.S. Food & Drug Administration (FDA) has extended the Prescription Drug User Fee Act (PDUFA) date for the company's first in class novel drug compound, crofelemer. The Agency's Priority Review of the New Drug Application (NDA) for crofelemer is for the indication of chronic diarrhea in people living with HIV/AIDS who are on anti retroviral therapy.

According to Salix Pharmaceuticals, Inc. (Salix), the PDUFA date, which was originally set for June 5, 2012, has been extended to September 5, 2012. The FDA apparently notified Salix that it extended the PDUFA date by three months because it needs additional time to conduct a full review of the NDA. According to Salix, the FDA has not requested additional studies.

Although Salix filed the NDA with the FDA for CRO-HIV, Napo discovered and developed crofelemer and owns all the IP related to the drug. On November 4, 2011, Napo terminated its Collaboration Agreement, dated December 9, 2008, with Salix because Salix breached the agreement. In May 2011, prior to terminating the Collaboration Agreement, Napo filed suit against Salix because of Salix's alleged failure to satisfy its contractual obligations to commercialize crofelemer in a timely manner. Crofelemer has received fast-track designation by the FDA to treat diarrhea in people living with HIV/AIDS.

Despite the announcement of crofelemer's highly statistically significant Phase 3 ADVENT trial results for CRO-HIV on November 4, 2010, Salix did not file the NDA with the FDA for this indication until December 2011 – after Napo filed suit against Salix and served Salix with its notice of termination of the Collaboration Agreement.

“Our company is committed to the advancement of crofelemer,” says Lisa A. Conte, CEO of Napo. “We are optimistic about our ability to bring it to the HIV community and the global marketplace as quickly as possible.” Napo has already invested tens of millions of dollars in the development of crofelemer.

According to the Center for Disease Control, there are 1.2 million people living with HIV/AIDS in the United States, of which approximately 338,000 suffer from chronic diarrhea.

Napo Pharmaceuticals, Inc.

Napo focuses on the development and commercialization of proprietary pharmaceuticals for the global marketplace. The company's business model merges traditional high-value markets in the West with the higher volume business models of emerging and developing economies. Napo's discovery process is based on the knowledge of traditional healers, or shamans, working in rain forest areas and provides benefit sharing to the communities with which it works. Visit Napo at


Contact: R.C. Auletta and Company
Jason Solomon, 212-355-0400

Posted: May 2012

Related Articles

Mytesi (crofelemer) FDA Approval History

More News Resources

Subscribe to our Newsletter

Whatever your topic of interest, subscribe to our newsletters to get the best of in your inbox.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.