An oral controlled release pharmaceutical composition comprising Blonanserin and release controlling agent(s) and optionally pharmaceutically acceptable excipients is provided. The present invention further relates to a controlled release pharmaceutical composition comprising Blonanserin and release controlling agent(s) such that the composition releases not less than about 80% of Blonanserin within 20 hours, when dissolution is carried out in 900 ml, 0.1 N HCI, USP apparatus Type II (Paddle) at 50 rpm for 20 hrs. The controlled release pharmaceutical composition of the invention releases 50% of Blonanserin between about 4 to 14 hours, when dissolution is carried out in 900 ml, 0.1 N HCI, USP apparatus Type II (Paddle) at 50 rpm.
