India’s leading Para IV challenger – Dr. Reddy’s Laboratories (DRL) has finally zeroed down to settle its pending Para IV patent litigation with GlaxoSmithKline (GSK) over the blockbuster anti-migraine drug, Imitrex, generically known as Sumatriptan Succinate which worth around US $ 890 million in sales in the U.S. market. GSK, under the terms of agreement, has agreed to grant an authorized generic (AG) status to DRL for its Imitrex tablets in the U.S. market which would eventually allow DRL to launch its authorized generic in the last quarter of 2008. After Merck’s blockbuster drugs, Zocor & Proscar, Imitrex is third in a row to fall in DRL expanding authorized generic portfolio. As far as DRL is concerned, it is undoubtly a win situation, both on strategic and financial frontier. This settlement strategically gives DRL an advantage over other generic manufactures and financially reduces DRL legal burden of fighting expensive patent litigations. But what made GSK to go about it?