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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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