In the warning letter, USFDA said its inspectors found significant violations of current good manufacturing practice (CGMP) regulations for finished pharmaceuticals at the site after inspecting it between August 31 and September 4, 2016.
The significant violations included the company's failure to follow adequate written procedures describing the handling of all written and oral complaints regarding a drug product, including provisions for review by the quality control unit, the USFDA said.
"This unreliable process compromises the quality, integrity, and sterility of solution. Although you implemented various corrective actions and preventive actions (CAPA) since 2013, you have continued to receive a large number of non- integrity complaints," the letter noted.
"Your firm acts as a contract manufacturer for various drug products. Your failure to comply with CGMP may significantly affect the quality, safety, and efficacy of the drugs you manufacture for your clients," USFDA said.
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It is essential that the company understands its responsibility to operate in full compliance with CGMP, and to immediately inform its customers of production problems or quality issues that may pose a patient hazard, it added.
"Based upon the nature of the violations we identified at your firm, we strongly recommend engaging a consultant to assist your firm in meeting CGMP requirements," USFDA said.
"Failure to correct these violations may also result in FDA refusing admission of articles manufactured at Indoco Remedies Limited, Plants II and III, L-32, 33, 34 Verna Industrial Estate Area, Verna, Goa, into the United States," it added.