Hay Fever Injection: How It Works and What It Costs
Millions of Brits are bracing for severe hay fever symptoms as a 'pollen bomb' descends on the UK. With pollen levels already 'very high' and set to increase due to early grass and weed seasons, over 10 million sufferers face weeks of discomfort. While antihistamines offer temporary relief, those with extreme symptoms may consider the hay fever injection Depo Kenalog, a corticosteroid that suppresses the immune system to reduce inflammation and allergic responses.
How the Hay Fever Injection Works
NHS GP Dr Asimah Hanif explains: "The hay fever jab is an injection of a steroid called Kenalog, or triamcinolone acetonide. When you have hay fever, your immune system overreacts every time you breathe in pollen, flooding your body with chemicals that trigger sneezing, congestion, and streaming eyes. Kenalog tells your immune system to stand down." The injection is administered into the buttock muscle and releases slowly over weeks, dampening the allergic response at its source.
Effectiveness and Duration
Most people feel relief within 24 to 72 hours, and the effects typically last the entire pollen season—between six and 12 weeks. It is generally not recommended to take more than one dose per year. However, the injection is only available privately, as Dr Hanif notes: "Corticosteroid injections for hay fever are not routinely recommended or commissioned by the NHS due to potential risks outweighing the benefits compared with safer alternatives."
Side Effects and Risks
The injection carries risks, including a weakened immune system that makes users more vulnerable to infections like flu, shingles, and chickenpox. Once injected, the steroid cannot be removed and circulates in the body for three to eight weeks. Dr Hanif warns: "The key thing to understand is that once it's in, there's no taking it back. The steroid stays in your system for weeks regardless, so if you get side effects, you have to wait them out." The injection is only suitable for adults with severe hay fever who have tried other treatments without success. It is not recommended for those who are pregnant, breastfeeding, under 18, or have uncontrolled diabetes, high blood pressure, glaucoma, or an active infection. Patients should also inform their health insurers, as claims may be rejected if the injection was received in the last two years.
Cost and How to Book
Private hay fever injections range from £60 to £150 per dose, depending on the clinic, dose needed, and whether consultation is included. The standard dose for adults under 75kg (11.8 stone) is 40mg, typically costing £75 to £95. The higher dose of 60mg to 80mg for adults over 75kg costs between £110 and £135. This price usually includes a consultation and administration. Patients should book through private GP clinics, independent pharmacies, or medical aesthetics clinics, and always check credentials before booking.
Alternative Treatments and NHS Advice
According to Allergy UK, different pollen types peak at different times: tree pollen in spring (March to May), grass and weed pollen in summer (June to August), and weed pollen tapering off in autumn (September to November) with mould becoming a factor. Experts recommend starting antihistamines, nasal sprays, and eye drops two weeks before your typical pollen season begins. If these don't work, consult a GP for stronger medications or allergy testing. NHS advice includes putting petroleum jelly around nostrils, wearing wraparound sunglasses or a wide-brimmed hat, keeping windows and doors shut, vacuuming regularly, and using pollen filters in car air vents and HEPA filters in vacuum cleaners. The NHS notes that hay fever symptoms are typically worse between late March and September and can last for weeks or months, unlike a cold which usually resolves in one to two weeks.
