The present invention is related to a bilayer pharmaceutical composition comprising naproxen or a pharmaceutically acceptable salt thereof. The present invention is particularly related to a bilayer pharmaceutical composition comprising an immediate release component and a controlled release component of naproxen or a pharmaceutically acceptable salt thereof and the process for preparation thereof. Moreover the present invention is related to the treatment of rheumatoid arthritis oesteoarthritis ankylosing spondylitis pain primary dysmenorrhoea acute tendinitis bursitis and acute gout.

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