Dynamic Vapor Sorption (DVS): Examining the Interaction of water vapor with APIs and Pharmaceutical formulations investigation Kumar Jeetendra | January 6, 2022 The water vapor or absorbent properties of pharmaceutical products like excipients, packaging films and drug formulations are acknowledged as key aspects that determine their storage stability, processing, and performance. In accordance with the US Pharmacopeia, moisture is not considered to be an impurity. However, the presence of water in a drug must be monitored and …