Bromfenac Works by Blocking the Enzymes That Cause Inflammation and Pain in Your Eye After Surgery

Your doctor prescribed Bromfenac eye drops to help your eye heal after cataract surgery — but how does a single drop actually reduce swelling and pain? Here's the plain-English explanation of how Bromfenac works in your body.

What Bromfenac Does in Your Body

Think of inflammation like a fire alarm going off in your eye after surgery. Your body detects the tissue disruption from the procedure and sends out chemical signals called prostaglandins that trigger swelling, redness, and pain. This is your body's natural healing response — but too much inflammation can actually slow recovery and cause discomfort.

Bromfenac works by blocking the enzymes that produce prostaglandins. Specifically, it inhibits cyclooxygenase (COX) enzymes, with a preference for COX-2 — the enzyme most responsible for inflammation.

Here's a simple analogy: imagine prostaglandins are water flooding a room, and COX enzymes are the faucets. Bromfenac turns off the faucets so the flooding stops, allowing your eye to calm down and heal without excessive swelling and pain.

Because Bromfenac is applied directly to your eye as a drop, it works right where it's needed. Very little of the medication gets absorbed into the rest of your body, which is why systemic side effects are rare. For details on what side effects can occur, see our Bromfenac side effects guide.

How Long Does It Take to Work?

Bromfenac starts working quickly. After you put the drop in your eye:

• The anti-inflammatory effect begins within minutes to hours of the first dose.
• Most patients notice a meaningful reduction in pain and discomfort within the first 1–2 days of use.
• The full anti-inflammatory benefit builds over the first several days of consistent use.

This is why it's important to use Bromfenac every day as prescribed — even if your eye starts feeling better after a few days. The medication needs to keep prostaglandin levels low throughout the critical 14-day healing window after surgery.

How Long Does Bromfenac Last?

Each dose of Bromfenac maintains its effect for roughly 12–24 hours, depending on the formulation:

• Prolensa (0.07%) and generic Bromfenac (0.09%): Dosed once daily, meaning one drop provides about 24 hours of anti-inflammatory coverage.
• BromSite (0.075%): Dosed twice daily (every 12 hours) for sustained coverage.

Once you complete the full 14-day course and stop using Bromfenac, the medication clears from your eye tissue within a day or so. By that point, the acute post-surgical inflammation should have resolved. For a complete overview of dosing, see What is Bromfenac? Uses and dosage.

What Makes Bromfenac Different From Similar Medications?

There are several NSAID eye drops used after cataract surgery. Here's how Bromfenac compares:

• Ketorolac (Acular, Acuvail): One of the oldest ophthalmic NSAIDs. Usually dosed 4 times daily, which is less convenient. Available as a cheaper generic. It's effective but requires more frequent dosing.
• Nepafenac (Nevanac, Ilevro): A "prodrug" — meaning it's inactive until it's absorbed into the eye, where enzymes convert it into its active form. Ilevro is once-daily dosing. Some doctors prefer it because the prodrug design may be gentler on the corneal surface.
• Diclofenac ophthalmic (Voltaren Ophthalmic): Another older NSAID eye drop, typically dosed 4 times daily. Available as a cheaper generic.
• Flurbiprofen (Ocufen): Used mainly during cataract surgery to prevent the pupil from constricting, not typically for post-operative inflammation.

Bromfenac's main advantage is its once-daily dosing (for Prolensa and the generic). When you're recovering from surgery and juggling multiple eye drops, having one that only needs to be used once a day makes a real difference in convenience and compliance.

Bromfenac also has strong COX-2 selectivity compared to older ophthalmic NSAIDs, which may contribute to its effectiveness at lower concentrations. Prolensa at just 0.07% is one of the lowest-concentration NSAID eye drops available, yet it provides 24-hour coverage.

If Bromfenac isn't available or is too expensive, your doctor may recommend one of these alternatives.

Final Thoughts

Bromfenac is a targeted anti-inflammatory eye drop that works by shutting down the prostaglandin production causing swelling and pain after cataract surgery. Its once-daily dosing and strong COX-2 selectivity make it a popular choice among ophthalmologists. The key to getting the most benefit is using it consistently for the full 14-day course your doctor prescribes.

Ready to fill your prescription? Search Medfinder to find Bromfenac in stock near you.