Federal prosecutors in Massachusetts say British drug maker GlaxoSmithKline PLC will pay $750 million to settle allegations that its subsidiary manufactured and sold adulterated drugs, including the popular antidepressant Paxil.

U.S. Atty. Carmen Ortiz on Tuesday announced that GlaxoSmithKline has agreed to settle civil and criminal charges related to the subsidiary in Puerto Rico.

Ortiz said the London-based company will pay $150 million in criminal fines and $600 million in civil penalties.

In 2005, GlaxoSmithKline agreed to fix deficiencies at its now-closed plant in Cidra, Puerto Rico, that allowed tablets of Paxil to split apart before reaching consumers.

A call to GlaxoSmithKline’s U.S. offices requesting comment was not immediately returned.