And it hasn’t appeared to have subsided.
Thousands of Brits are currently experiencing ‘super flu’ symptoms, leaving much of the country bedridden.
But a particular sector has been issued a further warning. People who are currently using weight loss injections.
Jason Murphy, Head of Pharmacy and weight loss expert at Chemist4U , has now explained the signs and warnings to look out for.
Had this super flu (influenza a) for 6 days now I genuinely feel like I’m dying soon
— iman (@imxnnali) January 4, 2026
He said: “With thousands already estimated to have the flu and more people than ever on weight loss injections in the UK, many may be facing flu season while on their medication for the first time.
“While some common side effects of weight loss injections, like headache, fatigue and nausea resemble flu symptoms, these are usually temporary and subside within a few days to a few weeks.
“It’s important to understand the difference: Weight loss injection side effects are caused by the medication and mainly affect the digestive system, blood sugar and other bodily functions, whereas flu symptoms are caused by a viral infection and primarily affect the respiratory system. Understanding the difference can help people manage their symptoms safely.
“If you start to feel unwell and your illness makes it difficult to eat three meals per day, or it’s generally impacting your appetite, you may wish to delay a dose until full recovery. This is suggested to minimise the risk of malnutrition and dehydration. If you’re unable to eat or drink normally, taking a medication that reduces appetite, like Mounjaro or Wegovy could make flu recovery more difficult. Without adequate food and liquids, you won’t be getting the vitamins and nutrients your body needs to fight off an infection.
“Staying hydrated is crucial on medications like Mounjaro and Wegovy, especially while ill.
“Proper hydration supports digestion and blood sugar control, while helping to prevent constipation. During flu season, dehydration can worsen medication side effects and flu symptoms.
“Some known warning signs include darker yellow urine, dry mouth and mild headaches, but people are not successful at spotting other signs like harder-than-usual bowel movements and unusual tiredness. It’s beneficial to consider adding an electrolyte drink or rehydration solution to help boost fluid intake and maintain hydration, particularly during this time of year.
“While experiencing the flu, it’s also recommended to rest and sleep, keep warm, and take paracetamol or ibuprofen to lower your temperature and treat aches and pains.
“By paying attention to flu symptoms (high temperatures, aching body, dry cough, sore throat, loss of appetite, etc.), following the above steps can help you get better quicker and back to your usual dosing. If you have concerns about managing your medication during illness, consult with your prescriber, doctor or pharmacist for personalised guidance.”
The NHS is urging anyone eligible to get their flu vaccination to help prevent them getting seriously ill.
Today’s data shows more than 17.4 million have been vaccinated so far this year – over 170,000 more than this time last year.
