The settlement is its largest-ever with a generic drugmaker over drug safety, according to the US government. It includes $150 million in payments for a criminal fine and forfeiture and $350 million in payments for civil claims.
The settlement has been in the works for some time. In December 2011, Ranbaxy set aside $500 million to resolve the potential criminal and civil liabilities related to the investigation by the government into its manufacturing practices and falsifying data.
The company reached a related settlement agreement with the US Food and Drug Administration in 2011.
"The financial provision Ranbaxy established in December 2011 will be sufficient to cover all material financial obligations under the agreement," the company said in a news release announcing conclusion of the US investigation.
Ranbaxy USA pleaded guilty to three felony counts related to the manufacture of drugs at two Indian locations that did not meet safety standards and to four counts of making material false statements.
In the civil settlement, Ranbaxy has agreed to pay $350 million to resolve allegations that drugs from the two Indian plants did not meet specifications and that false claims were submitted to US government healthcare programs between April 1, 2003 and September 16, 2010.
In 2008, the FDA banned the company from selling about 30 drugs in the United States after it found manufacturing deficiencies at facilities in India. In 2009, the FDA had accused the company of falsifying data and test results in drug applications and halted reviews of drugs made at a plant in northern India.
Ranbaxy, majority-owned by Japan's Daiichi Sankyo Co Ltd, stopped selling drugs to the US markets while it fixed problems with its manufacturing procedures in the United States and India.
"While we are disappointed by the conduct of the past that led to this investigation, we strongly believe that settling this matter now is in the best interest of all of Ranbaxy's stakeholders," Ranbaxy Chief Executive Arun Sawhney said in a statement.
"The conclusion of the DOJ investigation does not materially impact our current financial situation or performance," he added.
The company has since grappled with other manufacturing problems. In November 2012 it recalled some generic Lipitor, known as atorvastatin, in the United States after certain batches were found to contain glass particles. It has since resumed manufacturing the widely used cholesterol lowering medicine.