People paying privately for weight-loss drug Mounjaro in the UK face a rise in the cost of the treatment after manufacturer Eli Lilly said it was increasing the list price of the drug by as much as 170%.

It means the suggested price for a month's supply of the highest dose of the drug will rise from £122 to £330, although the rise for lower doses will be smaller.

More generally, retailers who sell the drug may be able to negotiate discounts to the list price, so it is possible the impact on consumers will be limited.

The announcement does not affect the price the NHS pays, as the service has negotiated a heavily-discounted rate for those getting the drug on prescription.

The weekly injection works by making you feel full so you eat less, and can help people lose 20% of their body weight.