TRENTON, N.J. — Ranbaxy Pharmaceuticals Inc. has recalled dozens of lots of its generic version of the cholesterol drug Lipitor because some may contain tiny glass particles, the latest in a string of manufacturing deficiencies that once led US regulators to bar imports of the Indian company’s medicines.

Ranbaxy, a subsidiary of Ranbaxy Laboratories Ltd., India’s biggest drug maker, is operating under increased scrutiny from the US Food and Drug Administration because of quality lapses at multiple Ranbaxy factories over the past several years.