Perrigo falls on restatement just hours after Greenlight's David Einhorn discloses holding

Blister packs of over-the-counter allergy medicines, manufactured by Perrigo.
Andrew Harrer | Bloomberg | Getty Images

Shares of Perrigo dropped after the close Tuesday after the maker of over-the-counter drugs restated financial statements from 12 different periods, including two full fiscal years.

The news came just hours after hedge fund titan David Einhorn revealed to clients he had a stake in the company.

Einhorn said in a letter that Perrigo should continue to grow profits in its core U.S. market, noting confidence in new management's ability to achieve earnings forecasts.

Perrigo's stock was off by 1 percent in extended trading.

Watch: Perrigo's CFO resigns in February

Perrigo CFO resigns, effective immediately