Buyout groups Bain Capital and Cinven launched their sweetened takeover offer for German generic drugmaker Stada (STAGn.DE) on Wednesday, giving shareholders until Aug. 16 to tender their shares, the companies said.

Stada said on July 10 that Bain and Cinven would raise their offer by 25 cents per share to 66.25 euros after their previous 5.3 billion euro ($6.1 billion) bid fell through.

The private equity groups are also lowering their acceptance threshold to 63 percent, after the last offer secured the support of 65.52 percent of shareholders, short of the 67.5 percent they had targeted.

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