What Is Xdemvy?

Xdemvy (Lotilaner ophthalmic solution 0.25%) is the first and only FDA-approved prescription eye drop for the treatment of Demodex blepharitis — a common but often underdiagnosed condition caused by an overpopulation of Demodex mites living on the eyelids and eyelashes. Symptoms include itching, irritation, redness, crusty or flaky eyelids, and a gritty or burning sensation in the eyes. Xdemvy is manufactured by Tarsus Pharmaceuticals, Inc. and was approved by the FDA in 2023.

How does Xdemvy work?

Xdemvy contains Lotilaner, an isoxazoline-class parasiticide that targets and kills Demodex mites. It works by inhibiting GABA-gated chloride channels specifically in the mites' nervous system, causing uncontrolled neural activity that paralyzes and eliminates them. Importantly, Lotilaner does not affect mammalian GABA receptors at therapeutic doses, making it safe for human use. The 6-week (42-day) treatment course is designed to cover at least two full Demodex mite life cycles, ensuring thorough eradication of both adult mites and newly hatched offspring.

What doses are available for Xdemvy?

• Ophthalmic solution 0.25% — 5 mL bottle
• Ophthalmic solution 0.25% — 10 mL bottle (typically used for the full 6-week treatment course)

The standard treatment is one drop in each affected eye twice daily (approximately 12 hours apart) for 42 days (6 weeks).

How hard is it to find Xdemvy in stock?

Xdemvy has a findability score of 55 out of 100, meaning it can be moderately difficult to locate. There is no active FDA shortage, but Xdemvy is a limited distribution drug (LDD) — it is only available through select specialty pharmacies like CVS Specialty and Walgreens Specialty. You will not find it at your regular retail pharmacy. Patients should expect the medication to be shipped directly to their home or picked up at a specialty pharmacy location. If your prescriber is unfamiliar with the ordering process, Tarsus Field Reimbursement Managers can help facilitate access.

Who Can Prescribe Xdemvy?

Xdemvy is prescribed by eye care specialists, including:

• Ophthalmologists — Medical doctors specializing in eye diseases and surgery
• Optometrists — Doctors of optometry who diagnose and treat eye conditions

If you suspect you have Demodex blepharitis (chronic eyelid irritation, crusty lashes, redness), schedule an appointment with your eye care provider. They can examine your eyelids under magnification to check for Demodex mites and determine if Xdemvy is right for you. Telehealth prescribing is generally not available for this medication, as an in-person eye exam is typically needed for diagnosis.

Is Xdemvy a controlled substance?

No. Xdemvy is not a controlled substance and is not scheduled by the DEA. It does not have abuse potential. However, it is only available through specialty pharmacies due to its limited distribution model, so a standard pharmacy cannot dispense it.

Common Side Effects of Xdemvy

• Eye stinging at the instillation site — reported in approximately 10% of patients
• Eye burning at the instillation site — reported in approximately 10% of patients

Less common side effects (occurring in fewer than 2% of patients) include:

• Chalazion or hordeolum (stye)
• Punctate keratitis (tiny scratches on the cornea)

Most side effects are mild and temporary. If you experience severe or persistent eye pain, vision changes, or worsening symptoms, contact your eye care provider promptly.

Alternative Medications to Xdemvy

Xdemvy is currently the only FDA-approved treatment specifically for Demodex blepharitis. However, several off-label and in-office alternatives may be considered:

• Tea Tree Oil lid scrubs (Terpinen-4-ol) — Over-the-counter eyelid cleansers containing tea tree oil or its active component. Requires consistent daily use and is generally less effective than prescription treatment.
• Ivermectin (oral or topical) — An anti-parasitic medication used off-label for Demodex. Available as oral tablets or topical cream applied to the eyelid area. Not FDA-approved for ocular Demodex.
• BlephEx (microblepharoexfoliation) — An in-office procedure that mechanically removes Demodex mites, biofilm, and debris from the eyelid margin. May need to be repeated periodically.
• Intense Pulsed Light (IPL) therapy — An in-office light-based treatment that can reduce Demodex populations and improve meibomian gland function. Often combined with other therapies.

Drug Interactions with Xdemvy

Xdemvy has no known major drug interactions listed in its prescribing information, as systemic absorption from ophthalmic use is minimal. However, there are important usage guidelines:

• Contact lenses — Remove contact lenses before instilling Xdemvy and wait at least 15 minutes before reinserting them.
• Other eye drops — If you use other ophthalmic medications, wait at least 5 minutes between each drop to prevent dilution and ensure proper absorption.
• Do not allow the dropper tip to touch your eye, eyelids, fingers, or any surface to avoid contamination.

Final Thoughts on Xdemvy

Xdemvy represents a breakthrough for the estimated 25 million Americans affected by Demodex blepharitis — a condition that was previously managed with inconsistent off-label treatments. As the first FDA-approved prescription specifically targeting Demodex mites, it offers a defined 6-week treatment course with a clear mechanism of action. The biggest hurdle for most patients is access and cost: Xdemvy is only available through specialty pharmacies and can cost nearly $2,000 without insurance. The good news is that insurance coverage has expanded to over 85% of insured patients, and with the manufacturer savings card, many patients pay $30 or less out of pocket. If you've been struggling with chronic eyelid irritation and haven't been evaluated for Demodex, ask your eye doctor — effective treatment is now available.