Here’s who will be able to get Mounjaro on the NHSA Mounjaro penA Mounjaro pen(Image: Peter Dazeley via Getty Images)

GPs in England will be able to prescribe weight loss jabs for the first time on the NHS on Monday, as the health service begins its mass rollout.

Some 220,000 people with the “greatest need” are expected to receive Mounjaro, also known as tirzepatide and made by Lilly, through the NHS over the next three years.

How does

Tirzepatide, or Mounjaro, is an antidiabetic drug which lowers blood sugar levels and slows down how quickly food is digested.

It makes you feel fuller for longer and therefore less hungry.

If the jab is recommended by a healthcare professional, those using it will need to eat a balanced, reduced-calorie diet and to exercise regularly while taking it, according to the NHS website.

Who might be eligible for Mounjaro on the NHS

In the first year of the programme, the drug will be offered to people with a body mass index (BMI) score of more than 40 who have at least four other health problems linked to obesity, such as type 2 diabetes; high blood pressure; heart disease; and obstructive sleep apnoea.

It was previously only accessible to patients through a special weight loss service, to severely obese people who also suffer from a range of other health problems.

Estimates suggest around 1.5 million people in the UK are already taking weight loss drugs, which may have been prescribed through specialist weight loss services or via private prescription.

How is Mounjaro

The drug is usually delivered through a self-administered weekly injection which a doctor or nurse will show patients how to use, the NHS website says.

Who cannot take Mounjaro

Mounjaro is not recommended for those who are pregnant or planning to get pregnant, breastfeeding or have certain health conditions, according to the NHS.

For those taking the contraceptive pill and using tirzepatide, the NHS recommends using an additional method of contraception, such as a condom, for the first four weeks of treatment and for four weeks after each dose increase as the contraceptive pill may not be absorbed by the body during this time.

What are the potential side effects of Mounjaro

Potential side effects of tirzepatide include nausea, vomiting, diarrhoea and constipation, according to the National Institute for Health and Care Excellence.