Andrx Gaining on Prilosec OK

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Andrx

(ADRX)

received FDA approval to market a generic version of

AztraZeneca's

(AZN) - Get Report

ulcer medication Prilosec, the world's best-selling drug.

Any generic product launch is currently on hold pending the outcome of litigation stemming from AztroZeneca's claim that generic drugs violate patents that have yet to expire. But Andrx plans eventually to market the drug in three different doses.

Shares of Andrx were recently trading up 9.3% to $69.35 on Instinet, after closing at $63.45 Friday.