It's about Viberzi. Allergen the maker of Viberzi, the newest IBS treatment, is pushing the FDA to discontinue donnatel Understandably so since its introduction early this year. There are no issues whatsoever with donnatel efficacy or safety. At close to $3000 Viberzi is at five times the price of donnatel and with harsher side effects. There are solid evidence that the FDA has been reviewing the status of donnatel but this is a lengthy process.