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. 2012 Apr 27;6:637–644. doi: 10.2147/OPTH.S23381

Update on twice-daily bromfenac sodium sesquihydrate to treat postoperative ocular inflammation following cataract extraction

Ester Carreño 1,✉, Alejandro Portero 2, David J Galarreta 1,3, José M Herreras 1,3
PMCID: PMC3346189  PMID: 22570544

Abstract

Ophthalmic bromfenac sodium sesquihydrate is a topically applied selective cyclooxygenase (COX)-2 inhibitor. It is similar to amfenac, except for a bromine atom at the C4 of the benzoyl ring position, which markedly affects its in vitro and in vivo potency, extends the duration of anti-inflammatory activity, and enhances its inhibitory effect on COX-2 absorption across the cornea and penetration into ocular tissues. The United States Food and Drug Administration approved bromfenac in 2005 for the treatment of postoperative inflammation and the reduction of ocular pain in patients who have undergone cataract surgery. Nonsteroidal anti-inflammatory drugs (NSAIDs), and among them bromfenac, could be even more effective than steroids at reestablishing the blood–aqueous barrier, as revealed by flare on slit-lamp examination and as quantitatively measured using ocular fluorophotometry. Similar to other NSAIDs, it has a role in inhibiting intraoperative miosis during cataract surgery. However, bromfenac also seems to be useful in other situations, such as refractive surgery, allergic conjunctivitis (not useful in dry eye), choroidal neovascularization, and even ocular oncology. No reports of systemic toxicity have been published and bromfenac has good topical tolerance with a low incidence of adverse effects.

Keywords: bromfenac, ophthalmic nonsteroidal anti-inflammatory drugs, inflammation, cataract surgery

Bromfenac sodium sesquihydrate

Molecule

Bromfenac sodium sesquihydrate, also denominated as sodium 2-amino-3-(4-bromobenzoyl) phenylacetate sesquihydrate, has a molecular weight of 766.34 and a molecular formula of C30H28Br2 N2 Na2O9 (Figure 1). The chemical structure is similar to amfenac, except for the addition of a bromine atom at the C4 of the benzoyl ring position. Containing a halogen in its structure enhances the molecule’s lipophilicity, thereby facilitating absorption across ocular tissues. The bromine atom of bromfenac has a marked effect on its in vitro and in vivo potency, extends the duration of anti-inflammatory activity, and enhances its inhibitory effect on cyclooxygenase (COX)-2 absorption across the cornea and penetration into ocular tissues.1,2

Figure 1.

Figure 1

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Molecular structure of bromfenac sodium sesquihydrate.

Mechanism of action

Bromfenac, a nonsteroidal anti-inflammatory drug (NSAID), has anti-inflammatory activity thought to be due to its ability to block prostaglandin synthesis by inhibiting COXs, an important group of enzymes active in the inflammatory process, which catalyzes the biosynthesis of eicosanoids from arachidonic acid to produce prostaglandins (PG) and thromboxanes.1 Prostaglandins are mediators of certain kinds of intraocular inflammation. In studies of animal eyes, PG have been shown to disrupt the blood–aqueous humor barrier and increase vascular permeability, vasodilatation, intraocular pressure, and leukocytosis.3,4

Two cyclooxygenases (COX-1 and COX-2) encoded by two different genes have been cloned and characterized. 5,6 Although COX-1 and COX-2 share a high level of homology (65%), the activity and expression of these enzymes are regulated differentially, and they can function independently within the same cell type.7 COX-1 is important for homeostatic functions, such as maintaining the integrity of the gastrointestinal mucosa, mediating platelet function, and regulating renal blood flow. COX-2 is often induced at sites of inflammation. Animal models have shown that COX-2 is the primary mediator for ocular inflammation.3 Therefore, inhibition of COX-2 is thought to be the most important therapeutic mechanism of ophthalmic NSAIDs.

NSAIDs have different relative potencies against COX-1 and COX-2. Bromfenac has been shown to be the most potent ophthalmic NSAID in inhibiting the COX-2 enzyme.4 It was approximately 32 times more active against COX-2 than COX-1 in a rabbit model and 18 times more potent than ketorolac in inhibiting COX-2.8

Ocular pharmacokinetics

The plasma concentration of bromfenac following ocular administration of bromfenac 0.09% ophthalmic solution in humans is unknown. Based on the maximum proposed dose of one drop in each eye (0.09 mg) and pharmacokinetic information from other routes of administration, the systemic concentration of bromfenac is estimated to be below the limit of quantification (50 ng/mL) at steady-state in humans.9

Studies evaluating the pharmacokinetic profile of topical bromfenac 0.09% revealed a maximum concentration of 95.3 ng/g in the aqueous humor after instillation of a single dose in rabbits.10 The time to maximum concentration in the aqueous humor in both studies was 2 hours.10,11 The half-life was 2.2 hours, but the drug remained detectable at 24 hours.10,11 In a separate multi-dose study, rabbits received one drop of bromfenac 0.09% three times daily for 14 days. The bromfenac concentration was 1103.0 ± 424.2 ng/g in the sclera; 78.1 ± 13.0 ng/g in the choroid; 32.4 ± 5.4 ng/g in the retina; 1.3 ± 0.2 ng/g in the vitreous; and 55.9 ± 9.2 ng/g in the aqueous humor.10

Human studies have revealed that the drug concentration required to reduce human COX-2 activity to half maximal (IC50) was achieved after a single dose of bromfenac,12 and the concentration of bromfenac in the aqueous humor of patients undergoing cataract surgery, after the instillation of one drop of bromfenac 12 hours prior to surgery, was in excess of the IC50 value for COX-2, but not the IC50 value for COX-1.13

Ocular commercial presentations

Bromfenac sodium ophthalmic solution 0.1% was first approved in 2000 as Bronuck® (Senju Pharmaceutical Company, Ltd, Osaka, Japan) and is currently approved for the clinical indications of the treatment of postoperative inflammation, blepharitis, conjunctivitis, and scleritis.14 The same formulation was approved in the United States in 2005 as XibromTM 0.09% (Ista Pharmaceuticals Inc, Irvine, CA) for the treatment of postoperative inflammation and the reduction of ocular pain in patients who have undergone cataract surgery. However, it has been unavailable since February 20119 because in October 2010, BromdayTM 0.09% (Ista Pharmaceuticals Inc) was approved by the Food and Drug Administration (FDA) as the first once-daily ophthalmic NSAID for the treatment of postoperative ocular inflammation and the reduction of ocular pain after cataract surgery.15 A generic formulation in 2011 was approved in the United States by Coastal Pharms. In Europe, Yellox™ 0.09% (Croma Pharma, GmbH, Leobendorf, Austria) was approved in 2011 for the treatment of postoperative ocular inflammation following cataract extraction in adults.16

Once-daily dose

Several studies have found that ophthalmic medications dosed less frequently tend to yield improved compliance and patient satisfaction.17 The benefits of less frequent dosing also include less exposure to benzalkonium chloride and a lower potential for adverse effects.18,19

Based on previous studies, which showed detectable concentrations of bromfenac at 24 hours after a single dose,10–12 the possibility of bromfenac 0.09% dosed once daily was studied.

Overall, bromfenac ophthalmic solution 0.09% dosed once a day appeared to be as effective as when dosed twice a day in treating post-cataract surgery anterior chamber inflammation, although no direct comparisons were made and the designs of the clinical trials were different.20,21 However, there are no studies determining the efficacy of once-daily doses in the treatment of posterior segment inflammation.

Adverse effects of ophthalmic bromfenac

Systemic adverse effects

Oral bromfenac was initially approved for the treatment of short-term pain in 1997.22 However, cases of fulminant hepatic failure were reported after prolonged use, and it was withdrawn from the market in 1998.23,24 Although the plasma concentration of bromfenac following ocular administration of bromfenac 0.09% ophthalmic solution in humans is unknown, it is supposed to be below the limit of quantification (50 ng/mL) and no reports of systemic toxicity have been published.9

Shiffman et al25 also confirmed the systemic safety. They showed normal liver function test values for more than 90% of subjects and no evidence of hepatic toxicity after 14 days of twice-daily dosing of topical bromfenac.18

Although exacerbation of asthmatic symptoms has been reported with the use of topical NSAIDs, such as diclofenac or indomethacin, these events have not been described with the use of topical bromfenac.26,27

Ocular adverse effects

The rate of serious ocular adverse events, reported 6 years after the use of topical bromfenac in one study, was 0.0002%.18 These serious ocular adverse events included five corneal ulcers, three corneal erosions, three corneal perforations, three corneal infiltrates, and two cases of corneal thinning.18 The most commonly reported adverse effects in the Phase III clinical trials of topical bromfenac included iritis, an abnormal sensation in the eye, eye pain, eye pruritus, headache, eye irritation (burning/stinging), and conjunctival hyperemia.18

The adverse effects of bromfenac eye drops in the ocular surface have been described as being particularly associated with the preservatives used in ophthalmic solutions, such as benzalkonium chloride. However, the experimental use of preservative-free bromfenac (commercially unavailable) also exhibited considerable toxicity in corneoconjunctival cell lines.28 In contrast, in Phase III clinical trials of topical bromfenac, safety assessments for subjects treated with bromfenac were generally equivalent to or better than those for subjects treated with a vehicle.18 Animal studies have implicated NSAIDs in delaying corneal wound healing29 and decreasing the migration of corneal epithelium.30 There are four reported cases of corneal melting and subsequent perforation in one of them after topical bromfenac use.31,32 In three of the reported cases of bromfenac-induced melting, the patients had severe ocular surface compromise. A role for metalloproteinase (MMP)-1 and MMP-8 has been proposed in NSAID-induced melting. An increase in MMP-1 and MMP-8 expression in eyes treated with diclofenac has been reported.33 Proteases play an important role in corneal degradation and NSAID use may be implicated in their overexpression.

One study assessed the effects of topical bromfenac in human corneal endothelial cells, and revealed it was unlikely to cause endothelium damage at the concentration used under the usual conditions.28

Bromfenac in cataract surgery

NSAIDs are one of the most commonly prescribed classes of medications worldwide. Aspirin and other chemically related compounds, the properties of which in oral presentations have been well known for many decades, have recently been prepared in topical ophthalmic formulations. Systemic indications are due to their analgesic, antipyretic, and anti-inflammatory properties.

In the United States, bromfenac ophthalmic solution 0.09% (XibromTM; Ista Pharmaceuticals Inc) was approved by the US Food and Drug Administration (FDA) in 2005 for the treatment of postoperative inflammation and the reduction of ocular pain in patients who have undergone cataract surgery.9

Mydriasis maintenance during surgery

Topical NSAIDs are FDA-approved for the inhibition of intraoperative miosis during cataract surgery. Several clinical studies have demonstrated similar mydriatic properties for diclofenac 0.1%,34,35 ketorolac 0.4% and 0.5%,36,37 suprofen 1%,38,39 flurbiprofen 0.03%,35 and bromfenac 0.09%.40 However, the effectiveness of topical NSAIDs on pupil size in vitreoretinal surgery appears to vary from one study to another.39

Reducing postoperative inflammation in cataract surgery

There is evidence that topical NSAIDs are capable of reducing postoperative inflammation after cataract surgery38,39 when used correctly and cause no significant side effects or toxicity. 41–44 However, there are only four FDA-approved drugs for this use: diclofenac, ketorolac, nepafenac, and bromfenac. Although studies comparing NSAIDs to corticosteroids have not revealed differences in the reduction of intraocular inflammation after cataract surgery,42,45–47 NSAIDs appear to be more effective at reestablishing the blood–aqueous barrier, as revealed by flare on slit-lamp examination and as quantitatively measured using ocular fluorophotometry.38,39,42,48 This is true for both bromfenac presentations currently available in the USA.20,21,40,49,50 Bromfenac has not been demonstrated to be superior to ketorolac in reducing the inflammation rate, but the incidence of corneal epitheliopathy was reported to be significantly higher.18 Takamatsu et al and Ohara et al’s case series comparing bromfenac and diclofenac drops after cataract extraction did not show any differences in the inflammation rate on days 7 and 28, respectively.51,52

Masuda et al compared several concentrations of twice-daily 0.01%, 0.1%, and 0.2% bromfenac drops in 228 cataract cases. The 0.1% and 0.2% solutions showed superior anti-inflammatory activity in contrast to the 0.01% solution. There were no adverse events that were concentration-dependent; thus, 0.1% bromfenac was deemed optimal to minimize any potential for corneal toxicity.53

Both once- and twice-daily dosing of bromfenac have been demonstrated to be beneficial for patients with a low rate of compliance or who need to minimize exposure to medications and excipients.18,20 However, efficacy data from clinical trials of bromfenac 0.09% with once-daily dosing cannot be directly compared to twice-daily dosing because the protocols for these clinical trials differ in terms of the predosing criteria and the Summed Ocular Inflammation Score (SOIS) end point scales used.21 Both dosing presentations achieved the prespecified efficacy end points of their respective clinical trials and were thus effective in comparison to the placebo group.

Miyanaga et al compared topical bromfenac to a topical steroid or a combination in 72 patients following cataract surgery. 54 They did not find any significant difference in anterior chamber inflammation in this case series. There is no recent larger controlled trial comparing the efficacy of bromfenac alone versus a steroid or a combination in cataract surgery. There are no publications about using bromfenac in glaucoma, strabismus, or vitreoretinal surgeries to reduce inflammation.

Reducing ocular pain in cataract surgery

Among subjects who experienced ocular pain after surgery, the median time for resolution of pain was 2 days for those treated with bromfenac compared with 5 days for those treated with a vehicle. The proportion of subjects who were pain-free was statistically significantly greater for the bromfenac group than for the vehicle group over all visits. 55,56 In January 2006, the FDA expanded the indication for bromfenac to include the reduction of ocular pain after cataract surgery on the basis of these results.

Cystoid macular edema

Cystoid macular edema (CME) remains the most common cause of vision loss after cataract surgery, with up to 58% of patients being reported to have some angiographic evidence of CME.57 On the other hand, the rate of clinically evident CME was much lower at 4.7% in those treated with a placebo and 1.8% in those treated with steroids.18 Currently, there is no FDA-approved treatment for the prevention or treatment of CME following cataract surgery. However, reviewing the world literature, Rossetti et al determined from a meta-analysis that the prevention and treatment of CME with NSAIDs is beneficial.58

It remains unclear whether prophylactic treatment prevents the onset of chronic CME or in some way decreases its severity. Therefore, the long-term benefit of prophylactic treatment remains unproven, making this FDA-unapproved indication controversial.59

Other ophthalmic uses of bromfenac

NSAIDs have increasingly been included in the therapeutic arsenal in ophthalmology. The treatment of intraocular inflammation and pain after cataract surgery and the treatment and prevention of cystoid macular edema are the main indications. However, NSAIDs have also been suggested to have some effectiveness in some pathology, but with a more limited action than other available agents. Their use in these cases can be considered additional therapy.

Allergic conjunctivitis

The pathogenesis of allergic conjunctivitis is complicated, but the mast cell and its chemical mediators are probably the most important components. These mediators comprise a wide range of molecules, including many different PG. Among them, PGE1 and PGE2 diminish the threshold of itching and become NSAIDs in potential therapy for allergic conjunctivitis. Topical ketorolac 0.5% is the only NSAID approved by the FDA for the relief of ocular itching in patients with seasonal allergic rhinoconjunctivitis.

In an experimental model, Hashimoto et al found that ketotifen was less effective in reducing PG than bromfenac, but it reduced plasma exudation significantly more. Moreover, ketotifen was much more effective in inhibiting the itch–scratch response than bromfenac.60

Miyake-Kashima et al compared bromfenac to the mast-cell stabilizer, pemirolast potassium. Improvements in objective clinical findings were similar for both, and subjective symptoms after one week of twice-daily dosing did not show any improvement for either agent.61

Uchio et al evaluated the efficacy and safety of bromfenac 0. 1% in the long-term management of vernal keratoconjunctivitis patients while mast cell stabilizers and topical steroids were continued. They found that the role of bromfenac in these patients might be to suppress the trigger-inducing recurrence of the disease by controlling the COX pathways. Once vernal keratoconjunctivitis recurred, bromfenac could not reduce the severity of the disease.62

Ocular surface inflammatory diseases

Oral NSAIDs are used as first-line agents in scleritis and episcleritis with good results. However, topical presentations have not had the same results and are therefore infrequently used.63 There is evidence that NSAIDs are more useful in the treatment of inflamed pinguecula and pterygium compared to topical steroids.64

Dry eye

Inflammation was included in the new definition of dry eye given by the International Dry Eye Workshop.65 Inflammatory mediators in the dry eye tear film are a potential target for molecules such as NSAIDs with lower side effects than topical corticosteroids. A recent study in a mouse model of dry eye raised the possibility that NSAIDs may help alleviate some of the signs and symptoms of ocular surface disease.66 However, corneal melting and perforations have been reported with NSAIDs, even with bromfenac, which prevents routine use in dry eye patients for these potential adverse events, especially in cases with corneal involvement.31,67

Refractive surgery

Surface laser procedures remove the corneal epithelium in different ways (laser, manual debridement, diluted alcohol, epikeratome) prior to laser ablation of the stroma. Regardless of which technique is used, laser reshaping of the cornea damages the sensory nociceptive fibers. Patients can experience various degrees of pain during the epithelial regeneration process, and NSAIDs are effective in controlling it. Moreover, they have the additional benefit of reducing inflammation by inhibiting COX. In ophthalmology, the primary topical analgesia used to control pain is NSAIDs and this medication has shown to be effective in photorefractive keratectomy.68,69

Sher et al found no significant differences in discomfort and safety between topical bromfenac 0.09% and ketorolac 0.4%, approved by the FDA to control postoperative photorefractive keratectomy ablation pain.69 However, Wang et al found there was less pain in eyes treated with bromfenac 0.09% than in those treated with ketorolac 0.5% following LASEK or epi-LASEK surgery. There were no statistically significant differences in uncorrected visual acuity between groups.70

Diabetic retinopathy

Both animal and human studies have demonstrated elevated levels of PG in eyes with diabetic retinopathy.71,72 Therapeutic inhibition of COX-2 in the retina may now be achievable with both topical nepafenac 0.1% and bromfenac 0.09%. The first one has demonstrated the ability to inhibit diabetes-induced retinal microvascular disease in animal models.73 Bromfenac may be as useful as nepafenac in animal models. However, there are no studies in humans and consequently, there is insufficient evidence to recommend the use of NSAIDs as prophylaxis or for primary treatment of diabetic retinopathy or even diabetic macular edema. Furthermore, other routes, including periocular and intravitreal, are currently being investigated to achieve greater therapeutic effects.74,75

Age-related macular degeneration

Age-related macular degeneration is the leading cause of blindness in developed countries.76 While the etiology and pathogenesis of this disease are complex and remain poorly understood, there is evidence from human and animal studies that inflammatory and immunological events play a central role.77

COX-2 is a promoter of angiogenesis and can be detected in human choroidal neovascular membranes.78 Thus, the inhibition of COX-2 by NSAIDs reduces vascular endothelial growth factor production and directly inhibits choroidal neovascularization in both trauma-induced and ischemia-induced animal models.74 In an experimental model, the use of topical bromfenac led to the translocation of Nrf2 and the induction of the antioxidant protein heme oxygenase (HO-1) in neovascularization lesions. The sizes of lesions were significantly smaller in the group of rats treated with bromfenac, indicating a potential therapeutic effect for intraocular angiogenic diseases.79 These findings can justify the results that showed bromfenac worked as an adjunctive therapy to intravitreal ranibizumab in a prospective randomized controlled trial, showing a beneficial effect in the change of macular central thickness.80 However, Zweifel et al found no benefit to the addition of topical bromfenac 0.09% twice daily over 2 months for patients receiving monthly intravitreal antivascular endothelial growth factor; in fact, there was limited response in terms of reducing persistent exudation.81

At present, there is insufficient evidence to recommend NSAIDs for prophylaxis or treatment of age-related macular degeneration in human beings.

Ocular tumors

It is well known that systemic NSAIDs reduce the incidence of colon cancer by 40%–50%, and several epidemiological, clinical, and experimental studies have established NSAIDs as promising cancer chemopreventive agents.82,83 At the same time, COX-2 expression is increased in both uveal melanoma and retinoblastoma. Some COX-2 inhibitors have been demonstrated in experimental studies to inhibit the proliferation of human retinoblastoma cell lines, limit the progression of uveal melanoma, and increase the radiosensitivity of uveal melanoma.84–87 Moreover, COX-2 expression appears to be correlated with tumor malignancy.88

Future studies about the therapeutic potential of NSAIDs in the treatment and prevention of ocular tumors are under way.

Method of literature search

In order to prepare this review, we conducted a Medline and PubMed search of the literature for the period between 2000 and 2011 using the following key words, as well as various combinations of them: bromfenac, Xibrom, ophthalmic NSAIDs. Reference lists from the selected articles were used to obtain further relevant articles not included in the electronic database.

Footnotes

Disclosure

The authors report no proprietary or commercial interest in any product mentioned or concept discussed in this article.

References

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