Prescriptions for diabetics are now costing the NHS in England more than £1bn a year, new figures show.

NHS Digital said the “total net ingredient” cost of prescriptions for diabetes was £1,012.4m in 2017-18, up from £983.7m a year earlier.

Almost one in 20 (4.9 per cent) of prescriptions written by GPs are for diabetes treatments, with 53.4 million items prescribed for diabetes last year.

They make up more than one-tenth (11.4 per cent) of total primary care net ingredient costs.

The figure is a significant increase on the number of diabetic treatments prescribed a decade ago – including insulins, antidiabetic drugs, and diagnostics and monitoring devices.

In 2007-08, there were 30.8 million prescription items for diabetes.

The biggest recent increases can be seen in treatments for type 2 diabetes, which affects about 90 per cent of patients.

Some 3.7 million people have been diagnosed with diabetes in the UK, according to Diabetes UK, while it is estimated that more than five million people will have the condition by 2025.

Professor Jonathan Valabhji, national clinical director for diabetes and obesity at NHS England, said: “Thanks to better diagnosis and treatment, the NHS is caring for more people than ever before with diabetes, and this new data highlights the urgent need to prevent type 2 diabetes from developing in the first place.

“The NHS diabetes prevention programme has now reached over a quarter of a million people at high risk of type 2 diabetes.”

Robin Hewings, head of policy at Diabetes UK, said the condition was the “biggest threat to the health of our country”.

“The number of people diagnosed with the condition has doubled in the last 20 years, and it is responsible for 26,000 early deaths per year alongside serious complications such as blindness, amputation or stroke,” he said.

“This data shows that diabetes prescribing costs £1bn, but is estimated that the total cost to the NHS is over £10bn a year – so the real price we have to pay for diabetes is not medications but the devastating and expensive complications.

“That’s why we need to focus spending more money on helping people manage their diabetes well.

“The NHS needs to maintain its focus on diabetes in its long-term plan, and particularly to make sure that people receive the education, care and technologies to help them manage their condition safely.”