The invention is directed to a pharmaceutical composition comprising:(a) naproxen sodium;(b) lactic acid in an amount of from 0.2 to 1.0 mole equivalents per mole of the naproxen sodium;(c) polyethylene glycol; and(d) a solubilizer selected from glycerin, polyvinylpyrrolidone, propylene glycol, or combinations thereof.The compositions of the invention may be encapsulated in a softgel capsule.