Product-specific testing conditions for in vitro feeding tube studies: The approved labeling for the reference product states that the product may be administered via a nasogastric (NG) tube. Conduct the in vitro feeding tube studies including comparative recovery testing and sedimentation volume and redispersibility testing. For general procedures of in vitro feeding tube studies, refer to the most recent version of the FDA guidance for industry on Oral Drug Products Administered Via Enteral Feeding Tube: In Vitro Testing and Labeling Recommendations.a