In the United Kingdom, the number of injections required for diabetic retinopathy specifically for diabetic macular oedema (DMO) is not a fixed figure but rather a tailored course of treatment. Because the underlying diabetes remains a chronic factor, most patients require a “loading phase” of frequent injections followed by a long-term “maintenance phase.” According to NHS and NICE management guidelines, the goal is to achieve a “dry” retina with stable vision using the fewest injections possible. While some patients may only need a few sessions, most will receive approximately 8 injections in the first year, with the frequency typically reducing in subsequent years as the condition stabilizes.
What We’ll Discuss in This Article
- The initial “Loading Phase” and why it requires monthly visits.
- Typical injection counts for common drugs like Eylea, Lucentis, and Vabysmo.
- How the “Treat and Extend” pathway reduces the number of visits over time.
- The difference between first-year and second-year treatment frequency.
- Why some patients may eventually be able to “pause” their injections.
- The role of stable blood sugar in reducing the need for repeat treatments.
The Initial Loading Phase
Every new course of anti-VEGF treatment in the UK begins with a “loading phase.” This is a series of injections designed to get the swelling under control and normalize the chemical environment of the eye as quickly as possible. During this phase, injections are given at fixed intervals, usually every four weeks.
The number of loading doses varies slightly depending on the specific medication your specialist chooses:
- Lucentis (Ranibizumab): Typically starts with 3 monthly injections.
- Vabysmo (Faricimab): Usually involves 4 monthly injections.
- Eylea (Aflibercept): Often starts with a course of 5 monthly injections.
Following this initial phase, your ophthalmologist will perform a high-resolution OCT scan to assess how well your macula has responded. If the swelling has subsided, you will move into the maintenance phase.
First-Year vs. Second-Year Frequency
Data from NHS clinical pathways, such as those used by the Royal Berkshire Hospital, indicate that the “treatment burden” is highest in the first 12 months. Most patients should expect to attend the clinic for approximately 8 to 9 injections during their first year of treatment.
In the second year, the frequency usually decreases. As the blood vessels become more stable and less “leaky,” the intervals between injections can be stretched. Many patients find they only require 4 to 6 injections in their second year. However, this is highly dependent on how well the patient’s blood sugar and blood pressure are managed, as these systemic factors directly influence how “stressed” the retinal vessels remain.
The “Treat and Extend” Pathway
To minimize the number of injections and hospital visits, the NHS uses a protocol called “Treat and Extend.” Once your retina is “dry” (no fluid visible on the scan), your specialist will gradually increase the time between your appointments.
For example:
- If your eye is stable after a 4-week gap, the next appointment is set for 6 weeks.
- If it remains stable, the next is at 8 weeks, then 12 weeks, and potentially up to 16 weeks.
- You still receive an injection at each of these visits to prevent the fluid from returning.
If the scan shows that fluid has returned at any point, the interval is shortened again to the previous “safe” timeframe. This proactive approach aims to find the maximum possible gap that keeps your vision preserved.
Total Injections by Medication Type
Modern medications are increasingly designed to last longer in the eye, which directly impacts the total number of injections a patient might need over several years.
| Medication | Typical 1st Year Total | Maintenance Interval |
| Lucentis (Ranibizumab) | ~8 Injections | Every 4 to 12 weeks |
| Eylea (Aflibercept) | ~8 to 9 Injections | Every 8 to 16 weeks |
| Vabysmo (Faricimab) | ~7 to 8 Injections | Every 8 to 16 weeks |
| Beovu (Brolucizumab) | ~6 to 8 Injections | Every 8 to 12 weeks |
| Ozurdex (Steroid) | 2 Implants | Every 4 to 6 months |
Can the Injections Ever Stop?
For some patients, the injections can eventually be paused. If the eye remains “dry” and stable for several consecutive 16-week intervals, your specialist may move you into a “Monitoring Phase.” During this time, you still attend regular check-ups with OCT scans, but you do not receive an injection unless the fluid shows signs of returning.
According to the Hull University Teaching Hospitals NHS Trust, the ability to stop treatment depends heavily on the stability of your diabetes. If your HbA1c and blood pressure are consistently within target, the retinal vessels are less likely to leak, significantly increasing the chances that you can successfully transition to monitoring only.
Conclusion
The number of injections for diabetic retinopathy typically starts with a loading phase of 3 to 5 monthly sessions, followed by a maintenance phase. Most patients in the UK receive around 8 injections in their first year, with the number decreasing as the eye stabilizes. Through the “Treat and Extend” pathway, specialists work to find the longest possible gap between treatments to reduce the burden of hospital visits while protecting your sight. If you experience severe, sudden, or worsening symptoms, call 999 immediately.
Is there a maximum number of injections I can have?
No. Many patients receive injections for several years. There is no evidence that having a high number of injections is harmful to the eye, provided they are managed correctly by a specialist.
What happens if I miss an injection?
Missing an appointment allows the VEGF levels to rise, which can cause fluid to return and potentially lead to permanent scarring. It is vital to attend every scheduled visit.
Why does my neighbor get fewer injections than me?
Everyone’s “leakiness” is different. Factors like the duration of diabetes, blood pressure, and individual genetics mean some eyes stay “dry” for longer than others.
Do I have to pay for each injection in the UK?
If you are treated by the NHS, the injections are free. In private clinics, such as Moorfields Private, each injection can cost from approximately £683.
Can I switch to a “longer-acting” drug to have fewer injections?
You should discuss this with your consultant. Newer drugs like Vabysmo or Eylea 8mg are designed to last longer, but the choice depends on your specific clinical response.
Will the injections work better if my blood sugar is lower?
Yes. Stable blood sugar reduces the underlying damage, which means the injections have less “work” to do and are more likely to keep the retina dry for longer.
Does an Ozurdex implant count as one injection?
Yes, but because it is a slow-release steroid, one Ozurdex “injection” provides treatment for up to 6 months, compared to the 1-4 months provided by anti-VEGF drugs.
Authority Snapshot
This article outlines the typical treatment frequency for diabetic retinopathy in the UK, incorporating 2024 and 2025 NICE and NHS management pathways. The content is written to meet UK medical standards and has been reviewed by the Medical Content Team to ensure alignment with current Royal College of Ophthalmologists protocols. Our goal is to help patients understand the timeline and commitment required for successful injection therapy.
