**9. Conclusion**

Preformulation studies are all about selecting a good drug candidate with the help of various supporting parameters. The utmost requirements are starting from the optimum drug candidate selection, API form of drug, compatible excipients, drug manufacturing process, stability studies as per regulatory guidelines, container and closure selection, solubility parameters, pharmacokinetics and biopharmaceuticals behaviour, and safety strategies all come up in physical and chemical properties optimization as per current industrial regulatory perspectives. Preformulation studies provide a strong and optimum scientific background of a drug molecule concerning "proof of concept" implementation in drug development, public safety concerns, new technologies of dosage forms, improvement of quality standards, and regulatory perspectives. All the preformulation parameters are should be studied for biological drug candidates and NCEs as well in every dimensional approach to have fewer chances of molecule failure. This review chapter summarises the path of drug candidate development facilitated by preformulation studies.
