US health regulator Food and Drug Administration has found as many as eight lapses in Ranbaxy's Toansa plant in Punjab which was recently banned by the US drug inspectors from making products for the American market.

"Our inspection of QC Analytical and Microbiological laboratories found the facility to be in significant disrepair. Laboratories windows within the instrumentation (eg: HPCL) rooms were found to be un-closeable," a report released by the FDA inspection teams said.

"Too Numerous To Count (TNTC) flies were observed throughout the sample preparation room, and laboratory re-agent/equipment/documentation storage cabinets were found to be broken and un-closeable," the report said.

Other lapses included usage of un-calibrated and unqualified instruments in laboratory, said the report, which was released two days ago.

This is the company's fourth plant to face regulatory action from the American health regulator after Mohali, Paonta Sahib amd Dewas plants.

Citing manufacturing norm violations, the FDA prohibited Ranbaxy Laboratories from distributing drugs produced at the Toansa unit, including medicines made by the company's Ohm Laboratories facility in New Jersey.

Expressing disappointment over the FDA ban, Ranbaxy had said it will cooperate with the FDA and "comply with Consent Decree in both letter and spirit".

The FDA inspection report further said that the Indian drugmaker repeated the same errors which were cited by the regulator in its earlier inspection in December 2012.

"Appropriate controls are not established over computerised systems... this is a repeat observation from the previous FDA inspection in 12/2012.

"Specifically the standalone computerised system controlling GC# 6 does not have sufficient controls to prevent unauthorised access to, changes to, or omission of data files and folders," the report said.

The audit team said that the raw material, intermediates and finished API (active pharma ingredients) analytical results found to be failing specifications or otherwise retested until acceptable results are obtained.

These results are not reported.

The FDA notice said Ranbaxy is required to hire a third- party expert to thoroughly inspect the Toansa facility and certify to the FDA that the facility and its methods and controls are adequate to ensure continuous compliance with cGMP (Current Good Manufacturing Practices).

"Ranbaxy will not be permitted to resume manufacturing and distributing API for FDA-regulated drugs from the Toansa facility until the agency is satisfied that Ranbaxy has addressed its manufacturing quality issues at that facility," it further said.