164. Food and Drug Administration (FDA) Agency within the US Public Health Service that is responsible for approving the safety, efficacy and marketability of medicines, among other health-related services.
165. formulation Process during which an active drug is combined with different chemical substances to form the final medicinal product.
166. free drug Drug in the body that is not bound to a protein (e.g., albumin), target or antibody.
167. free jet expansion The diffusion model for carrier gas and ions transitioning from a mass spectrometer ion source through an orifice aperture into the vacuum region.
168. freeze–thaw stability The assessment or establishment of stability of an analyte in a matrix when frozen and thawed, usually with reference to three freeze–thaw cycles in a method validation context.
