Tablet coatings are of great importance to both consumers and pharmaceutical manufacturers. By controlling the release of the active pharmaceutical ingredient, tablet coatings ensure bioavailability and minimize harmful effects and the waste of the drug by delivering it at the specific site and at the optimum level. These functions can be compromised if a coating is nonuniform or has defects. The exceptional properties of terahertz radiation -- including its low photon nonionizing energies and its ability to penetrate most nonpolar materials that can be opaque for visible light or low contrast for X-rays -- make this radiation a very attractive tool for helping to understand pharmaceutical materials and products.
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