This system is a guidance provided by the U.S. Food and Drug Administration [1]. The United States Food and Drug Administration is the government agency responsible for regulating food, dietary supplements, drugs, cosmetics, medical devices, biologics and blood products in the United States. ...

According to the Biopharmaceutics Classification System (BCS_(disambiguation)), drug substances are classified as follows: BCS may mean: Bowl Championship Series Business Capability Specification Beechen Cliff School, public school in Bath, UK Brampton Christian School, private school in Brampton, run by KRT Bryan-College Station, Texas - Location of Texas A&M University British Computer Society BCS theory of conventional superconductivity, named for Nobel Prize winners...

• Class I - High Permeability, High Solubility
• Class II - High Permeability, Low Solubility
• Class III - Low Permeability, High Solubility
• Class IV - Low Permeability, Low Solubility

More to read on BCS Guidance page [2] Permeability has several meanings: In electromagnetism, permeability is the degree of magnetisation of a material in response to a magnetic field. ... A substance is soluble in a fluid if it dissolves in that fluid. ...