Abstract
Almost 40% of the new chemical entities at present self find out poorly water soluble drugs. Badly water soluble drugs have solubility and dissolution related bioavailability problems. Solubility is one of the most important parameter to give desired concentration of drug in systemic circulation to get its pharmacological response. Orally administered drugs obtained completely absorb only when they show fair solubility in gastric medium and such drugs shows good bioavailability. The solubility and dissolution properties of drugs perform an valuable role in the process of formulation development. Enhancement of solubility of drug is the most challenging job in drug development process. Solubilization may be affected by co solvent water interaction, micellar solubilization, reduction in particle size, inclusion complexes, solid dispersion, and change in polymorph. This review highlight various techniques of solubility enhancement with special emphasis on Chemical modification methods like Salt formation, Co-crystallization, Co-solvency, Hydrotropy, use of novel solubilizer etc along with physical modification techniques.
 Keywords: Salt formation, Co-crystallization, Solubility, particle technologies, Milling solubility enhancement, Cosolvent, physical and chemical methods.
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