Polyvinylpyrrolidone, average Mw~29000 is a multifunctional synthetic polymer with an average molecular weight of 29,000 Da. Polyvinylpyrrolidone, average Mw~29000 is a versatile excipient for both conventional formulations and novel controlled or targeted delivery systems, serving as a binder, coating agent, suspending agent, pore-former, solubilizer, stabilizer, etc[1].