Doctors’ leaders have raised concerns over a lack of clarity about drug availability highlighted by no-deal Brexit planning.
The British Medical Association (BMA) warns “a culture of secrecy” could undermine the ability of medics to plan care and deliver treatment.
Confidential NHS England files, seen by Newsnight, suggest supply chain issues mean some drugs “cannot be stockpiled”.
The government said it has been “as transparent as possible”.
With political discussions continuing and EU leaders having agreed a six-month extension to Brexit, the Department for Health has been co-ordinating work across the sector, involving the NHS, pharmaceutical companies and others to prepare for a no-deal Brexit scenario.
“Stockpiling is just one part of our multi-layered approach to minimise any supply disruption, which includes alternative transport routes,” a spokesman said.