Latisse is applied once nightly to the upper lash line using a sterile, single-use applicator and one drop of solution per eye. The full process takes about two minutes, but the details matter. Applying it incorrectly won’t just waste product; it can cause unwanted hair growth or discoloration on surrounding skin.
How Latisse Works
Your eyelashes cycle through phases of active growth, rest, and shedding. Latisse contains a prostaglandin analog that extends the active growth phase by stimulating receptors in the hair follicle. The result is lashes that grow longer before they naturally fall out, while also becoming thicker and darker over time. This is the same compound used in higher-dose eye drops for glaucoma, repurposed at a lower concentration specifically for lash growth.
Step-by-Step Application
Start with a clean face. Remove all makeup and take out contact lenses if you wear them. Your skin around the eyes should be dry.
Pull one sterile applicator from its tray. Hold it horizontally and place a single drop of Latisse on the flat part of the applicator near the tip, but not directly on the tip itself. You want the solution sitting on the brush surface, not dripping off the end.
Draw the applicator carefully along the skin of your upper eyelid, right where your lashes meet the skin. Move from the inner corner of your lash line to the outer corner in one smooth stroke. If excess solution drips beyond the lash line, blot it off with a tissue. This step is important because the active ingredient can cause darkening or fine hair growth on any skin it touches repeatedly.
Throw the applicator away. Use a fresh one for the other eye. Never reuse an applicator or dip the same one back into the bottle, as this introduces bacteria near your eyes. Only use the applicators that come in the Latisse package, not cotton swabs, eyeliner brushes, or other tools.
Where to Apply (and Where Not To)
Latisse is FDA-approved for the upper lash line only. Do not apply it to the lower lash line. The solution naturally migrates downward through blinking, so your lower lashes may see some benefit on their own, but deliberately applying it below the eye increases the risk of side effects. Do not drop the solution directly into your eye. If it does get into your eye, it’s not expected to cause harm and you don’t need to rinse it out.
Dosage and Frequency
One drop per eye, once per night. That’s it. Applying more than one drop or using it twice a day will not make your lashes grow faster or fuller. Extra application only increases the chance of side effects and wastes product. If you miss a night, just resume the next evening. One skipped dose won’t affect your results.
Contact Lens Users
Remove your contacts before applying Latisse. Wait at least 15 minutes after application before putting them back in. The solution contains preservatives that can be absorbed by soft contact lenses, so this buffer time matters.
When to Expect Results
Latisse works gradually. Most people notice the first visible changes in lash length around week 4. By week 8, lashes typically look noticeably thicker and darker. Full results appear around week 16, which is four months of consistent nightly use. If you stop before 16 weeks, you won’t see the complete effect.
Patience is genuinely required here. The growth phase of eyelash follicles is slow, and the product needs time to shift enough follicles into active growth simultaneously for a visible difference.
What Happens When You Stop
Latisse does not permanently change your lashes. Once you stop using it, your lashes gradually return to their original length, thickness, and color over a period of 3 to 24 weeks. The change isn’t sudden, so missing a few days or even a week won’t erase your progress.
Many people switch to a maintenance schedule after reaching full results, applying every other night or a few times per week instead of nightly. This can help preserve some of the effect while stretching the product further, though Allergan (the manufacturer) only formally recommends nightly use.
Side Effects to Watch For
The most common side effects are mild: itchy eyes, redness along the lash line, and darkening of the eyelid skin where the solution is applied. The skin darkening is usually reversible once you stop using the product.
A less common but more concerning risk is permanent darkening of the iris, the colored part of your eye. This was observed in about 1% of glaucoma patients who used the same active ingredient at higher doses applied directly into the eye. The color change happens slowly, starting around the pupil and spreading outward. It’s most relevant for people with lighter or mixed-color eyes (hazel, green, blue-brown). With Latisse’s lower dose applied to the skin rather than the eye, the risk is considerably smaller, but it exists.
Fat Loss Around the Eyes
Prolonged use of prostaglandin analogs, including the ingredient in Latisse, can cause fat cells around the eye socket to shrink. This can make the eyes appear more sunken or hollow, with a deeper crease in the upper eyelid. The American Academy of Ophthalmology notes that mild versions of this effect are likely common among long-term users, though severe cases are less frequent. In documented cases, the eye appeared sunken by as much as two millimeters. The effect can develop so gradually that users don’t notice it until comparing photos. If you notice a hollow look developing around your eyes after months of use, this may be why.
Who Should Be Cautious
If you’re already using prostaglandin-based eye drops for glaucoma or elevated eye pressure, adding Latisse can interfere with how well those drops work. You’d need monitoring from your eye doctor if you want to use both. People with active inflammation inside the eye (such as uveitis) should also use caution, as the active ingredient can worsen it. The same goes for anyone who has had certain types of lens surgery, particularly if the posterior lens capsule was compromised, since there’s an elevated risk of swelling in the retina.
If you develop an eye infection, experience sudden vision changes, or have eye surgery while using Latisse, pause use and get guidance from your prescriber before continuing.