Strong growth in Jazz Pharmaceuticals’ narcolepsy drug Xyrem makes The Motley Fool believe the good times will continue to roll.

Xyrem is fast approaching blockbuster status, as sales grew 37% in 2014 to more than $770 million. Despite this strong growth, as of the fourth quarter of 2014 Xyrem was being used by only about 12,250 patients in the U.S., a small fraction of the 160,000 that are believed to have narcolepsy, making me believe that Xyrem looks poised for continued growth in the years ahead.

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