Combinatorial chemistry, computational molecular modeling and high throughput screening in drug discovery have significantly increased the number of poorly soluble drugs. About 40% of drugs developed in the past and about 90% of the drugs in development are poorly soluble drugs. When administered orally, a drug has to first dissolve in gastrointestinal fluids before it can be absorbed in to the blood and reach its site of action. The objective of this review article is to outline the key...