Abstract
Solubility can be defined as the amount of solute dissolved in a solvent at certain conditions to yield a single-phase system. Solubility of active pharmaceutical ingredients is considered the main parameter to get the most desired drug concentration in general circulation
 in order to achieve the desired therapeutic effect. Poor aqueous solubility considered the main problem occurs in the formulation progress of new chemical entities; in addition to the standard improvement; solubility is the main dispute for formulation scientists. The drug must appear as solution at the site of absorption in order to be absorbed. Many physical or chemical modification techniques are used to improve the solubility of low aqueous soluble drugs, in addition to other techniques such as particle size reduction, crystal engineering, salt formation, solid dispersion, use of surfactant and complexation. The selection of the solubility improvement methods depends on drug characteristics, location of absorption and the features of the administered dosage form.
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