Avenova is a prescription eyelid cleanser that uses a dilute solution of hypochlorous acid (0.01%) to remove debris and bacteria from the eyelid margins. It is FDA-cleared as a Class I medical device, not a drug, and is primarily used by people with blepharitis, meibomian gland dysfunction, and dry eye related to eyelid inflammation. The product comes as a spray and is made by NovaBay Pharmaceuticals.
How Avenova Works
Your eyelid margins naturally harbor bacteria, and in conditions like blepharitis, those bacteria multiply and form a sticky layer called biofilm. The organisms produce toxins and enzymes that break down the oils your meibomian glands secrete, triggering inflammation and contributing to evaporative dry eye. Avenova’s hypochlorous acid disrupts this biofilm and kills the bacteria living within it.
Hypochlorous acid is actually a molecule your own white blood cells produce to fight infection. The synthetic version in Avenova mimics that process. Lab studies show it has broad-spectrum activity against common eyelid bacteria, including MRSA, with greater than 99.9% kill rates against several bacterial species in under one minute. Because it works through a different mechanism than traditional antibiotics, it is less likely to promote bacterial resistance.
What It’s Used For
Avenova is most commonly recommended for chronic blepharitis, which causes red, irritated, crusty eyelid margins. It is also used for meibomian gland dysfunction, a condition where the oil-producing glands along your eyelids become clogged or inflamed, and for general eyelid hygiene before and after eye surgery. Some eye care providers prescribe it for demodex blepharitis, a form caused by microscopic mites that live at the base of eyelashes. In clinical observations, patients using Avenova showed significant improvement in redness and a visible reduction in the debris and cylindrical crusting around their lashes that is characteristic of demodex.
Many patients who try Avenova have already been through other treatments. In clinical reports, patients with chronic blepharitis and meibomian gland dysfunction experienced positive results with Avenova even after failing with antibiotics, traditional lid scrubs, baby shampoo, and other over-the-counter products.
How to Use It
The recommended routine is twice daily, once in the morning and once at night. You spray it directly onto your closed eyelids, or spray it onto a cotton round or lint-free pad and gently wipe along your eyelid margins. There is no need to rinse afterward. The solution does not sting the way some other eyelid cleansers do, and it dries without leaving a residue.
Consistency matters more than technique. Blepharitis is a chronic condition, and Avenova works best as an ongoing hygiene routine rather than a short-term fix. Most providers recommend using it indefinitely, similar to how you would use a daily face wash.
How It Compares to Baby Shampoo and Lid Scrubs
For years, the standard advice for eyelid hygiene was to use diluted baby shampoo on a washcloth. Avenova represents a different approach. Unlike baby shampoo and most commercial lid scrubs, it contains no surfactants or detergents. That distinction matters because surfactants strip the natural oils from your eyelid skin, which can cause dryness and contact dermatitis over time. This is counterproductive when you’re trying to restore healthy oil flow from your meibomian glands.
Avenova is also non-toxic and non-sensitizing to the skin, which makes it better suited for long-term daily use on delicate eyelid tissue. Baby shampoo has no antimicrobial activity against eyelid biofilm, while Avenova’s hypochlorous acid actively breaks it down. The tradeoff is cost: Avenova requires a prescription and is significantly more expensive than a bottle of baby shampoo, and insurance coverage varies.
Side Effects and Precautions
Avenova is well tolerated by most users. It does not contain the preservatives found in many eye drops that commonly cause irritation with long-term use. That said, you should stop using it and contact your eye care provider if you experience eye pain, changes in vision, or redness and irritation that worsens or persists beyond 72 hours. Do not use the product if it has changed color or become cloudy, as this indicates the solution has degraded. If you are pregnant or breastfeeding, check with your provider before starting it.
FDA Classification and What “Prescription” Means Here
Avenova is cleared by the FDA through the 510(k) pathway as a Class I medical device. This is the lowest-risk device classification, the same category as bandages and tongue depressors. It is not classified as a drug, which means it went through a different regulatory process than prescription medications. The “prescription” label means it is sold through eye care providers rather than over the counter, but it does not carry the same regulatory weight as a prescription pharmaceutical.
NovaBay Pharmaceuticals also sells related products, including NeutroPhase (a wound cleanser) and CelleRx (a skin care product), all based on the same hypochlorous acid platform. Over-the-counter hypochlorous acid sprays are available from other manufacturers at lower price points, though they differ in formulation and purity. Your eye care provider can advise on whether a specific alternative is comparable.