When will there be a generic form of Xifaxan?

It looks like the patent for Xifaxan will expire in 2019, but it's still very hard to guess when the generic will become available. Some drugs, like Viagra, have had expired patents for years, but delay the generic process in the courts, allowing them to produce only brand name Viagra for years and make a lot of money. The best way to find out would be probably to call the manufacturer of Xifaxan and see if they can tell you when you could expect a generic on the market.