Fluocinolone implants for uveitis – sight-saving and treatment-sparing

Real-world data show that intravitreal fluocinolone implants can improve visual acuity and reduce the need for systemic treatment in patients with uveitis. In this interview Ann Marie Goacher, Specialist Head and Neck Pharmacist, University Hospitals Sussex, describes how the implants are used and the results of a recent audit of their use in patients with uveitis at University Hospitals Sussex. She also offers insights into the role of the clinical pharmacist in ophthalmology.

Uveitis

Uveitis is an umbrella term for inflammation affecting the uvea, the middle layer of the eye. Patients can present with pain, photophobia, blurred vision and floaters. Uveitis can be caused by infections but can also be associated with auto-immune inflammatory diseases such as rheumatoid arthritis, Crohn’s disease or Behcet’s disease. If untreated, uveitis can impair vision permanently; “There is potential for vision loss from this inflammation and the damage that it causes. It can induce macular oedema, which is leaky fluid in the eye and if that fluid accumulates at the macula, which is responsible for your central vision, then it can impact your vision temporarily, but if left untreated can lead to permanent vision loss”, explains Ms Goacher.

Treatment of uveitis

The primary goal of treatment is the control of inflammation to prevent damage such as macular oedema. The clinical approach to uveitis is determined by the anatomical site of the inflammation. Anterior uveitis, affecting the front of the eye, is typically managed with topical steroid or anti-inflammatory drops. However, topical treatments cannot penetrate deeply enough for intermediate, posterior, or panuveitis, and systemic steroids are the standard first-line treatment. “If we can’t control patients on systemic steroids or …. if you can’t get patients off the steroids without them flaring back up with their uveitis you would then move on to secondary immunosuppressive medications. So, commonly we’d use mycophenolate or azathioprine”, says Ms Goacher. The biological, adalimumab is available as a third-line treatment, she adds.  Immunosuppressive treatment is steroid-sparing and can enable patients to transition off systemic steroids and avoid long-term side effects. Despite these options, an unmet need persists for patients who do not tolerate immunosuppressants, those who require maximal treatment but still experience flares, or those for whom systemic steroids are contraindicated.  Fluocinolone acetonide intravitreal implants (Iluvien ®), which provide local treatment, can be useful in these situations.

Fluocinolone intravitreal implants

The fluocinolone acetonide implant is a miniature device, measuring only 3.5 mm in length and 0.37 mm in diameter—roughly the size of a grain of rice. It is designed to be injected into the vitreous (the jelly-like part of the eye), where it slowly elutes the medication over a period of up to three years.

The implantation is performed as an outpatient procedure.  After the administration of numbing drops, the device is injected; the process typically takes 10 to 20 minutes, followed by a course of antibiotic drops. Once implanted, the patient cannot feel the device, and the polymer shell remains in the eye after the drug has been fully eluted.

Real-world clinical outcomes

Ms Goacher conducted an evaluation of 45 eyes (34 patients) treated with fluocinolone implants since 2019. The study group included patients with associated systemic inflammatory diseases, such as rheumatoid arthritis or Crohn’s disease. The findings highlighted several key clinical benefits:

• Visual acuity: 58% of patients experienced an improvement in visual acuity.
• Macular oedema resolution: At the six-month mark, 80% of patients with macular oedema saw the condition resolve.
• Systemic treatment reduction: 84% of patients taking systemic immunosuppressive medication were able to reduce their dosage, and three patients were able to stop systemic treatment entirely.
• Topical treatment reduction: There was a 20% reduction in the need for topical drops among the study group.

While the implant is designed to last three years, the audit found the average time to treatment failure (defined as the need for rescue therapy, such as increased drops or additional implants) was approximately 15 months. However, not all the patients had reached the three-year time point, notes Ms Goacher. Nevertheless, one-third of the patients in the study did reach the three-year mark without requiring further intervention, she says.

Managing complications

The use of local steroids in the eye is associated with known complications, primarily cataract development and increased intraocular pressure (IOP). In this audit,16% of patients developed cataracts post-insertion, with the average time to surgery being 12 months. Furthermore, 11% of patients experienced an IOP rise at the three-month mark. While three patients required surgery to manage this pressure, most cases were manageable with glaucoma drops.

From a clinical perspective, these complications are often viewed as a necessary trade-off; as Ms Goacher notes, cataract surgery is a routine, “bread and butter” procedure, whereas uncontrolled inflammation can lead to permanent, irreversible blindness.

Conclusion and future directions

The real-world data suggests that fluocinolone implants offer a robust option for stabilising uveitis and reducing the systemic medication burden on patients. Current efforts are focused on refining this data by looking at long-term outcomes for patients who have had the implant for two or more years to provide further insights into treatment efficacy.

Ophthalmology specialist pharmacist

The role of the specialist pharmacist in ophthalmology is expanding. Although initially Ms Goacher’s role was concerned with oversight of high-cost drugs, it has since grown considerably. The ophthalmology team at the Sussex Eye Hospital was welcoming and supportive and she soon found that ophthalmology offered many opportunities for pharmacy input. “It may not be that obvious on the outset but as soon as you scratch the surface there’s a lot to do in ophthalmology for pharmacy”, she says. For pharmacists looking to specialise in this important field, Ms Goacher highlights the support available through the UK Ophthalmic Pharmacy Group (UK OPG), which provides a network for advice and collaboration.