Pre-formation
The word Pre-formation refers to the steps to be undertaken befor formation.
Pre formation include determation physical and chemical properties of drug substance with goal of developing a new drug is safe,stable and efficacious. (Data called )
Investigation of physicalochemical properties of the new drug.
Goals and objective of preformation
-to determise the physicalochemical property of drug.
-to determise the kinetics and stabily.
-to determise compatibility of new drug with excipient.
-to determise problem that may arise during preformulation.
physicalochemical property of drug:
a)Physical properties :
- physical form(crystal and amorphous)
- Particle size, shape.
- Flow properties.
- Solubility properties ( pKa,pH,partition, coefficient)
- Polymorphism.
b) Chemical properties :
- Hydrolysis
- Oxidation
- Reduction
- Racemisation
- Polymerization.
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