Here, the drug reservoir is formed by first suspending the drug solids in an aqueous solution of a water soluble liquid polymer and then dispersing the drug suspension homogenously in a lipophilic polymer by high shear mechanical force to form a large number of microreservoirs. These are unleachable microscopic spheres of drug reservoirs . This thermodynamically unstable dispersion is stabilized quickly by immediate addition of cross linking polymers like Gluteraldehyde the polymer which produces a medicated polmer disc with a constant surface area and a fixed thickness. A transdermal therapeutic system is produced by positioning the medicated disc at the centre and surrounding it with an adhesive rim and then it is spread on to the occlusive base plate with adhesive foam pad.