By Tess Stynes 
 

Actavis Inc. (ACT) said it received U.S. Food and Drug Administration approval for its generic version of GlaxoSmithKline PLC's (GSK, GSK.LN) Lamictal drug for epilepsy and bipolar disorder and plans to launch its tablet--called Lamotrigine--immediately.

Actavis said as the first applicant to submit a substantially completed application to the FDA, it may be eligible for 180 days of generic market-exclusivity, though the regulator won't make a decision on that unless another applicant becomes eligible within 180 days after Lamotrigine's commercial launch.

The company cited IMS Health data indicating U.S. Lamictal sales reached about $51 million during the 12 months ended May 31.

Actavis in May agreed to acquire Warner Chilcott PLC (WCRX) for about $5 billion in an all-stock deal aimed at enlarging Actavis's portfolio of specialty pharmaceutical brands--and shrinking its tax burden.

Actavis shares were up 34 cents at $125.52 in light after-hours trading. Glaxo's American depositary shares were unchanged at $52.62.

Write to Tess Stynes at Tess.Stynes@dowjones.com

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