Discuss as:

Cholesterol-lowering generic Lipitor recalled for glass particles

Indian drugmaker Ranbaxy Laboratories Ltd has recalled its generic version of Pfizer Inc.'s cholesterol-lowering drug Lipitor in the United States after certain batches were found to contain glass particles.

Ranbaxy's U.S. subsidiary, Ranbaxy Pharmaceuticals Inc, said the recall affects certain lots of 10-, 20- and 40-milligram doses of the drug, known generically as atorvastatin calcium. The 80-milligram dosage is not affected.

The company is conducting an investigation which it expects will take two weeks. It did not report any injuries connected to the tainted pills and did not say how the problem was discovered. 

 It's the latest in a series of problems, dating to 2006, involving manufacturing deficiencies at multiple Ranbaxy factories and alleged doctoring of test results on some medicines. U.S. regulators had banned imports of 30 Ranbaxy medicines and wouldn't approve any new products for sale until Ranbaxy agreed to make improvements and be monitored by a third party for five years.

"Given its dominant share of this high-volume drug, we are certain to see supply shortages over the next two weeks," said Ross Muken, an analyst at ISI Group LLC.  The near-term impact is likely to be felt most by retail pharmacies and more modestly by wholesalers, he added.

The recall is the latest in a series of manufacturing problems at Ranbaxy, which is operating under heightened scrutiny following a long-running dispute with the U.S. Food and Drug Administration.

In 2008 the FDA banned the company from importing about 30 drugs after it found manufacturing deficiencies at two of the company's facilities in India. In 2009 the U.S. government accused Ranbaxy of falsifying data used in drug applications.

Last December, Ranbaxy agreed to make changes to its manufacturing plants in the United States and India. And it said it would set aside $500 million to resolve any potential civil or criminal charges stemming from an investigation by the U.S. Department of Justice.

Under a proposed settlement earlier this year, Ranbaxy agreed to engage a third party to conduct a review of its facilities, implement procedures to ensure data integrity in its marketing applications, and ensure it meets good manufacturing practices.

During its first six months on the market, when it enjoyed marketing exclusivity, atorvastatin generated sales of nearly $600 million for Ranbaxy, according to Bhagwan Singh Chaudhary, a research associate at the brokerage IndiaNivesh.

"The (recall) will impact the company's credibility," said Chaudhary. "A recall suggests corrective measures suggested by the U.S. FDA are not being implemented."

Other drugmakers, including Indian rival Dr. Reddy's Laboratories Ltd, have launched their own versions of Lipitor, and the market has become more competitive.

In 2008, Japan's Daiichi Sankyo Co acquired a majority stake in Ranbaxy in a deal valued at $4.2 billion.

Reuters and The Associated Press contributed to this report

More health news from NBCNews.com:

Rapid action needed to stop malaria in Greece 

FDA approves first-of-its-kind flu vaccine

US abortions drop 5 percent, biggest decline in a decade