For the formation of a drug, a pharmacologically active compound must be prepared
in a specific form. The drug must be manufactured, packaged, stored, transported,
administred and delivered to a target in the body. To successfully prepare a drug form that
will be robust through manufacturing, stable before administration and active with high
bioavailability after administration, one needs to produce solid forms with controlled crystal
structure and particle size and shape - often as multi-component composites. Considering
drugs as materials, one can apply the knowledge of solid-state chemistry and materials science
and non-ambient conditions to obtain solid forms with optimized properties. These
conditions include, among others, different types of mechanical and ultrasonic treatment,
hydrostatic compression, high-temperature or cryogenic spray-drying and crystallization
from supercritical solvents. Solid-state reactions (e.g. dehydration or clathrate decomposition)
can be effective in accessing metastable polymorphs or in micronizing a sample uniformly.
To achieve control over the drug forms and the processes used for their robust manufacturing, one needs
to take into account both the thermodynamic and kinetic aspects of their transformations.
Keywords: Polymorphism, cocrystals, composites, mechanochemistry, cryotechnologies, micronization, solubilization, drug delivery.
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