The six-largest drug firm in America shipped more than 3 million prescription opioids to a single pharmacy in West Virginia over the course of 10 months - averaging out to 10,000 pills a day.

McKesson Corp. sent 'massive quantities' of hydocodone to the now closed Sav-Rite Pharmacy in Kermit, West Virginia, according to a congressional report that was released on Wednesday.

The deliveries continued even after a McKesson warehouse in Ohio flagged the orders in 2007, added the report obtained by the West Virginia Gazette Mail.

McKesson had reported to the Drug Enforcement Administration that purchases made were 'reasonable' during that period.

McKesson Corp. sent 'massive quantities' of hydocodone to the now closed Sav-Rite Pharmacy in Kermit, West Virginia

The shipments made to Kermit and to other southern coalfields in the state were among a dozen 'case studies' used in the report, released by the House Energy and Commerce Committee.

Cardinal Health and AmerisourceBergen were also blasted by the scathing report - which also included regional suppliers Miami-Luken and H.D. Smith.

The report claimed that all took part in systemic 'failures that contributed to the worsening of the opioid epidemic' by sending an 'inordinate' number of painkillers to the state.

Between 2005 and 2016, McKesson, AmerisourceBergen and Cardinal Health shipped 900 million hydrocodone and oxycodone pills.

More than 3million prescription opioids were delivered to West Virginia in the span of 10 months

The number of those who fatally overdosed in West Virginia as a result reached the thousands.

The DEA was also critiqued heavily in the report.

'Our bipartisan investigation revealed a number of alarming failures by the DEA and drug distributors to address the opioid epidemic,' said Representative Greg Walden, R-Oregon, the committee's chairman.

McKesson had reported to the Drug Enforcement Administration that purchases made were 'reasonable' during that period

'In instances identified by the report, [the] DEA and the drug distributors did not meet their obligations, and played a part in contributing to our nation's opioid crisis.'

Included in the report was a transcribed interview with Dr. Joseph Mastandrea, board chairman of Miami-Luken, where he referred to the shipments sent to the small town as an 'abomination.'

Only Miami-Luken has accepted any wrongdoing for the prescriptions, while the other four have denied any wrongdoing.

On Wednesday, Cardinal Health said it would 'continue to implement rigorous anti-diversion controls,' adding that it was an 'intermediary' in the supply chain.

AmerisourceBergen added: 'The comparatively few examinations of AmerisourceBergen's actions primarily focus on due diligence surrounding physicians.

'AmerisourceBergen has virtually no interaction with physicians and limited legal ability to gather information on their practices and prescribing behavior.'