'Physicochemical principles of pharmacy' (physical pharmacy or pharmaceutics) comprises the study of drug formulations and their design, manufacture and delivery to the body. The definition extends to the targeting of drugs and delivery systems to specific sites in the body, the fabrication of nanopar-ticles and the design of delivery devices. The early chapters of the book examine the properties of drugs and excipients in the solid state and in solution. Specific classes of materials and systems, such as surfactants, emulsions, suspensions, colloids, polymers and macromolecules, feature in subsequent chapters. The oral and parenteral routes of administration are discussed. In a chapter on interactions and incompatibilities, the authors remind readers that although many interactions are pharmacological in nature, some have a basis in physical chemistry, such as those arising from electrostatic interactions between oppositely charged drags or from complexation between drugs and ions or drugs and nolvmers
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