such as u201c comprises u201d u201c comprising u201d u201c includes u201d u201c including u201d are to be interpreted inclusively unless the context requires otherwise that is the use of these words may imply the inclusion of an element or elements not specifically recited the present invention has been described by way of example only and it is to be recognized that modifications thereto falling within the scope and spirit of the appended claims and which would be obvious to a person skilled in the art based upon the disclosure herein are also considered to be included within the scope of this invention the above said invention can be illustrated by but not limited to following example s weighed quantity of api rate controlling polymer diluent and channelizer are sieved dry mixed or granulated with binder solution and then lubricated the granules are compressed to form tablet using rotary compression machine the tablets are then coated using film coating solution described in table 2 quetiapine fumarate was mixed with microcrystalline cellulose or lactose sodium chloride hpmc k4m or hpmc k100m and granulated with polyvinyl pyrollidone dissolved in isopropyl alcohol or and purified water mixture the granules were dried sized mixed with magnesium stearate and talc and compressed to form a tablet the tablets of example 1 to 6 are then film coated using coating solution of table 2 tablets of examples 1 6 were tested in dissolution studies in a usp i apparatus in differential ph medium i e 2 hr 0 1 n hcl 2 hr phosphate buffer ph 5 5 amp 20 hr phosphate buffer ph 6 8 the temperature and agitation were set at 37 u00b0 c u00b1 0 5 u00b0 c and 100 rpm respectively aliquots of sample were withdrawn at.