New prescription rules from September mean UK households could face a £122 charge. The cost of the weight loss jab Mounjaro is set to increase in the UK, with 15mg costing from £122 a month to £247.50.

An Eli Lilly spokesperson said: “We are working with private providers on commercial arrangements to maintain affordability and expect these to be passed on to patients when the change is effective on September 1.

“We are already seeing providers respond in different ways to the list price change, with a range of options available for eligible patients. We also want to work in partnership with the Government to expand NHS access for eligible patients, building on the commitments in the Government’s 10 Year Plan.”

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