Suspensions are biphasic liquid dosage forms of medicament in which finely divided solid particles in the range 0.5–5.0 microns are dispersed in a liquid or semisolid vehicle. Suspensions are taken orally or by parenteral route. They are used for both internal and external applications. It is easy to dispense unstable or degradable drugs in suspension form. It is the only choice if the drug is not soluble in water and nonaqueous solvent is not acceptable, but occurrence of sedimentation of solids results in a poor form of product. It may lead to caking, which is difficult to redisperse.