4 Findings About Bimatoprost for Sparse Eyebrows

A large trial found improved brow fullness

The 2016 Allergan-funded trial¹ enrolled 357 adults, mean age 54; about 95% were women. After seven months, at least a one-grade improvement on a four-point brow-fullness scale occurred in 77.1% with once-daily bimatoprost 0.03%, 83.9% with twice-daily treatment and 43.0% with vehicle.¹

That outcome describes a change in a fullness rating, rather than a percentage increase in individual hair counts.¹

Twice daily was not statistically compared with once daily

The investigators did not perform statistical comparisons between the two active schedules. Their percentages therefore do not establish that applying more often adds benefit. People with alopecia areata or substantial permanent loss from overgrooming were excluded, so the findings do not cover every cause of sparse brows.¹

A small gel comparison does not prove equal effects

A 2023 trial² followed 60 women for 16 weeks, with 20 per group using research-prepared gels: bimatoprost 0.03%, bimatoprost 0.01% or minoxidil 2%. All three groups improved from baseline.²

Between-group differences in graded fullness, hair count and diameter were not statistically significant. Participants reported greater satisfaction with the 0.03% bimatoprost gel, but that is a different outcome. This small comparison does not establish equivalence between the medicines, or show that the gels are interchangeable with other formulations.²

The U.S. label covers eyelashes

LATISSE’s U.S. indication is inadequate eyelashes, with application to the upper eyelid margin. Eyebrow use is off-label. The eyebrow trials do not turn the eyelash instructions into an approved brow regimen.³

The label warns about eyelid skin darkening and increased brown iris pigmentation; iris changes are likely permanent. Bimatoprost can also affect eye pressure and interfere with glaucoma treatment that uses prostaglandin drops. Bring the names of all eye medicines to a prescriber before discussing treatment.³

Ask which cause of brow loss is being treated, which formulation is proposed, what improvement to measure and when to review. Our brow-loss guide explains why checking the cause belongs before a cosmetic fix. The prescribed lash-treatment checklist covers eye-care details for people already prescribed LATISSE.

The “Your Hair Log” section of Hair, Everywhere records consistent monthly photographs, treatment start dates and relevant health changes. Bring that dated record to the appointment.