WASHINGTON — Drug manufacturer Forest Pharmaceuticals Inc. was sentenced today by U.S. District Judge Nancy Gertner to pay a criminal fine of $150 million and forfeit assets of $14 million following the company’s guilty plea in November 2010 to one felony count of obstructing justice, one misdemeanor count of distributing an unapproved new drug in interstate commerce and one misdemeanor count of distributing a misbranded drug in interstate commerce, the Justice Department announced.