Glossary and Definitions
stream and enters the interstitium (extracellular fluid) and/or the cells of the
tissues. The delivery of a drug from the plasma to the interstitium primarily
depends on blood flow, capillary permeability, the degree of binding of the drug
to plasma and tissue proteins, and the relative hydrophobicity of the drug.
Vehicle. A more or less inert substance added in a prescription as a diluent or
vehicle or to give form or consistency when the remedy is given in pill form;
A colloidal state in which the molecules of the dispersed phase form a three-
dimensional structure in the continuous phase to produce a semisolid material
protein mixture) forms, on cooling, a stiff gel in which the molecules of the
continuous phase are trapped in the holes of a “brush-heap” like structure of
the gelatin. Administered orally.
Microemulsions are thermodynamically stable, optically transparent, isotropic
mixtures of a biphasic oil-water system stabilized with surfactants. The
diameter of droplets in a microemulsion may be in the range of 100 A to 1000 A.
Microemulsion may be formed spontaneously by agitating the oil and water phases
with carefully selected surfactants. The type of emulsion produced depends upon
the properties of the oil and surfactants utilized.
Semisolid preparations intended for topical application. Most ointments are
applied to the skin, although they may also be administered ophtalmically,
nasally, aurally, rectally, or vaginally. With a few exceptions, ointments are
Body of systematic scientific knowledge, manual dexterity and deftness,
individual who has completed the formal education and examination required for
membership in a profession.
A clear, colorless, odorless and tasteless liquid, H2O that is essential for
various forms of water, as rain. A bodily fluid, as urine, perspiration or
tears. Any of various liquids that contain and somewhat resemble water.
Naturally occurring water exerts its solvent effect on most substances it
contacts and thus is impure and contains varying amounts of dissolved inorganic
and bicarbonates as well as dissolved and undissolved organic matter and