Merck & Co. (MRK) plans to complete its $430 million acquisition of Inspire Pharmaceuticals Inc. (ISPH) on Monday after its tender offer for the target's shares got a warm reception from investors.

When the companies unveiled the $5-a-share cash deal last month, both boards approved it and a fund managed by private-eqity firm Warburg Pincus LCC that owned a 28% stake in Inspire agreed to tender its shares.

The deal represented a 26% premium when it was announced, but was still well below Inspire's stock's peak of $8.74 in December, shortly before its release of negative clinical data for an experimental cystic fibrosis drug sent shares tumbling. In the wake of the setback, Inspire cut 27% of its work force and sharpened its focus on its eye-care business.

Merck said Friday that about 75% of Inspire's shares had been tendered when the offer expired at midnight Thursday.

The deal represents a modest-sized bet on the opthamology market for the pharmaceutical giant, which in March said it applied for approval to market a glaucoma treatment in the U.S.

Merck's shares dipped 0.2% to $37.13 in recent premarket trading.

 
   -By Matt Jarzemsky, Dow Jones Newswires; 212-416-2240; matthew.jarzemsky@dowjones.com 
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