Eyelashes protect your eyes from dust, sunlight, and small particles. They also frame your eyes. Hypotrichosis means having fewer eyelashes than normal. It can happen for many reasons, including an autoimmune condition, an infection, a thyroid problem, chemotherapy, or an inherited trait.
How Eyelash Serums Work
Most over-the-counter eyelash serums are cosmetics that condition the lashes. They do not have proven growth effects. The prescription option is bimatoprost (brand name Latisse). According to the FDA, Latisse (bimatoprost ophthalmic solution) 0.03% was first approved in 2008 and is indicated for the treatment of hypotrichosis of the eyelashes. It is a prescription drug.
How to Apply Bimatoprost
Follow the product’s instructions. For bimatoprost, MedlinePlus says to apply it once a day in the evening, to the skin of the upper eyelid only. Do not apply it to the lower eyelids, and do not apply it to broken or irritated skin. Use a new, sterile applicator for each eye. Do not share applicators.
How Long Does It Take to Work?
It may take at least 4 weeks before you see any benefit from bimatoprost, and up to 16 weeks to see the full effect. Bimatoprost only increases eyelash growth while you are using it. If you stop, your lashes return to their original appearance within several weeks to months.
Can the Serum Cause Eye Staining or Side Effects?
Bimatoprost can cause side effects, including itchy eyes, dry eyes, eye irritation, and redness. It can also cause darkening of the eyelid skin, which may be reversible if you stop using it. Call your doctor if you notice changes in your vision or severe eye irritation.
Frequently Asked Questions
Are eyelash serums safe for sensitive eyes?
If you have sensitive eyes, patch-test first and stop using the product if you get redness, irritation, or discomfort. Talk to an eye doctor before using any serum near your eyes.
How do over-the-counter eyelash serums differ from prescription treatments?
Over-the-counter serums are cosmetics. They condition the lashes but have no proven growth effect. The prescription treatment is bimatoprost (Latisse), which the FDA first approved in 2008 to treat hypotrichosis of the eyelashes.
Eyelash serums can help your lashes look conditioned, but only the prescription treatment bimatoprost (Latisse) is approved to grow lashes. Talk to your doctor or dermatologist before you start.
Disclaimer: This article is for general information only. It is not medical advice or a substitute for professional guidance. Talk to a doctor before using any eyelash serum.
Last Updated: 6 November 2026