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Late-stage surprises in oral drug development can derail timelines when formulation changes impact absorption. This document shows how integrating permeability testing early helps reduce that risk and better predict in vivo performance. Using telmisartan as a model, it highlights how common excipients influence both solubility and permeability—and how early insights can guide smarter formulation decisions. It also demonstrates how tools like PAMPA and dissolution-permeation assays support more informed development. Download to see how a permeability-driven approach can improve formulation strategy, align in vitro and in vivo results, and reduce uncertainty throughout development.