An improved immediate release solid dosage form of naproxen with a certain particle size distribution for the intragranular portion, and a certain particle size distribution for the carbonate portion that allows naproxen to remain in solution and achieves fast dissolution and fast absorption of naproxen. The invention provides a naproxen dosage form that when administered to a human in a fasted state provides an average blood plasma naproxen concentration of at least 15-20 μg/ml in 10 minutes or less. The invention also provides a naproxen dosage form that when administered to a human in a fed state provides an average blood plasma naproxen concentration of at least 15-20 μg/ml in 50 minutes or less.
