Impax Laboratories Inc. (IPXL) said it has licensed from AstraZeneca PLC (AZN) the exclusive U.S. commercial rights to three formulations of Zomig, giving the specialty pharmaceutical company access to a migraine headache medication.

Impax will pay AstraZeneca $130 million in 2012 for the rights and then pay tiered royalties thereafter. The agreement, which is expected to immediately benefit Impax's adjusted earnings, also gives the company non-exclusive rights to develop new products containing Zomig. The formulations licensed are Zomig tablets, orally disintegrating tablets and nasal sprays.

In the 12 months ended Sept. 30, Zomig had U.S. sales of $163 million, Impax said.

"The Zomig product franchise fits well with the capabilities of our neurology focused specialty sales force," said Michael Nestor, president of the company's Impax Pharmaceuticals unit. "It will support the growth of our commercial organization."

Impax expects to add about 20 sales representatives to its existing contract sales force of 64 to assist in Zomig sales.

In November, Impax said its third-quarter earnings sank on sharply lower revenue from its global pharmaceuticals division.

Shares were halted premarket after closing Tuesday at $18.88, and are up 3.7% over the past three months.

-By Ben Fox Rubin, Dow Jones Newswires; 212-416-3108; ben.rubin@dowjones.com

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