How Latanoprost Works, Results, Usage, and Side Effects

Latanoprost, a prostaglandin analogue initially approved for treating glaucoma, has garnered interest in the medical community for its
potential applications in hair regrowth. This article delves into the science behind latanoprost’s mechanism of action concerning hair loss and the studies that support its efficacy.

Close up showing the before and after results of using latanoprost to treat hair loss and balding

What is Latanoprost?

Latanoprost is an ophthalmic medication primarily used to treat eye conditions like glaucoma and ocular hypertension. While not originally intended for this purpose, some individuals have explored its off-label use for promoting hair growth. This off-label use is based on the observation that latanoprost, when used in the eyes, can lead to side effects such as increased eyelash length and thickness. It is believed that similar effects may occur when applied to the scalp, leading to longer and thicker hair strands. However, the effectiveness and safety of latanoprost for hair loss treatment remain subjects of ongoing research and debate, and its use for this purpose should be discussed with a healthcare provider or dermatologist.

History of Latanoprost

Latanoprost, originally developed as a medication to manage glaucoma and ocular hypertension, has an intriguing history when it comes to hair loss. It gained initial approval from the U.S. Food and Drug Administration (FDA) in 1996 under the brand name Xalatan for the treatment of eye conditions characterized by elevated intraocular pressure. During the clinical trials for its ophthalmic use, an unexpected and fascinating side effect emerged – enhanced eyelash growth. Patients who used latanoprost eye drops for their eye conditions reported remarkable changes in their eyelashes, including increased length, thickness, and darkness. This unanticipated cosmetic benefit piqued the interest of researchers and the beauty industry.

This unexpected eyelash growth side effect led to the development of Latisse, a reformulated version of latanoprost specifically designed for cosmetic use. Latisse gained FDA approval in 2008, becoming a prescription medication used to treat hypotrichosis, a condition characterized by inadequate or sparse eyelashes. It is applied topically to the base of the eyelashes to enhance their appearance.

As researchers delved into the cosmetic potential of latanoprost, they began exploring its capacity to stimulate hair growth on the scalp. Studies and clinical trials were conducted to investigate its efficacy in addressing conditions like androgenetic alopecia, which is characterized by male and female pattern hair loss. Although findings indicated promise, the use of latanoprost for promoting scalp hair growth remains off-label and necessitates further research to establish its safety, effectiveness, and long-term benefits.

How Latanoprost Treats Hair Loss

Latanoprost is a medication with a potential role in promoting hair growth, although its exact mechanisms in this context are not fully understood. Here’s how latanoprost is believed to treat hair loss:

  • Prostaglandin Analog: Classified as a prostaglandin analog. Prostaglandins are naturally occurring lipid compounds that play various roles in the body, including regulation of inflammation and blood flow. In the case of hair growth, prostaglandins are thought to influence the hair growth cycle.
  • Prolonging Anagen Phase: Hair growth occurs in cycles, including the anagen (growth), catagen (transition), and telogen (resting) phases. The goal of hair loss treatment is to prolong the anagen phase, allowing hair to grow longer and thicker. Latanoprost is believed to extend the duration of the anagen phase, promoting the growth of longer and healthier hair.
  • Increased Blood Flow: Prostaglandins, including those mimicked by latanoprost, are thought to improve blood flow to hair follicles. This enhanced blood circulation may provide the follicles with more nutrients and oxygen, supporting hair growth.
  • Potential Reduction in Inflammation: Prostaglandins may also have anti-inflammatory properties. Inflammation can contribute to hair loss in some cases, and reducing inflammation in the scalp may help maintain the health of hair follicles.
  • Unknown Mechanisms: While the above mechanisms are proposed theories, it’s essential to note that the precise mechanisms by which latanoprost stimulates hair growth are not fully elucidated. More research is needed to understand its effects on hair follicles comprehensively.

Empirical Evidence

The serendipitous discovery of latanoprost’s effects on eyelash growth paved the way for further explorations into its potential for scalp hair regrowth.

  • Eyelashes vs. Scalp Hair: The robust hair growth in eyelashes of glaucoma patients using latanoprost became a significant observation point. While this effect was undeniable, its efficacy on the scalp needed separate validation. Clinical studies, including those published in notable dermatological journals, showed that topical latanoprost application led to a modest increase in hair density on the scalp over a period of months.
  • Comparative Efficacy: Research comparing latanoprost with established treatments, such as minoxidil, provides further insights. While both agents induce hair growth, their efficacy profile differs. Latanoprost shows particular potency for eyelashes, while minoxidil exhibits broader effectiveness on scalp hair.
  • Safety Metrics: The safety profile of latanoprost for hair growth has been generally positive. Unlike its application in the eye, where it can induce iris pigmentation changes, such side effects haven’t been prominent when used for hair growth. This is possibly due to the differential dosing and application techniques.
Clinical trial results of using latanoprost to treat hair loss and balding

Clinical results comparing placebo before (A) to placebo after (C) with latanoprost before (B) and latanoprost after (D) to treat hair loss.


The results of using spironolactone for treating hair loss can vary from person to person. Some individuals may experience positive outcomes, while others may not see significant improvement. Here are potential results and considerations associated with spironolactone treatment for hair loss:

  • Slower Hair Loss Progression: May help slow down or halt the progression of hair loss in some individuals. By blocking the effects of androgens, such as testosterone and dihydrotestosterone (DHT), on the hair follicles, it can reduce follicular miniaturization, a characteristic feature of hair thinning and loss.
  • Maintenance of Existing Hair: One of the primary goals in hair loss treatment is to help maintain the size and function of existing hair follicles. This can lead to the preservation of thicker and healthier hair strands, contributing to a fuller appearance.
  • Potential Hair Regrowth: While the main focus is typically on slowing hair loss, some individuals may experience hair regrowth in areas where hair had previously thinned or receded. The extent of regrowth can vary among individuals and may be more noticeable in those with less severe hair loss.
  • Positive Outcomes in Women: It is often considered more suitable for women with androgenetic alopecia, as it is generally less effective in treating male pattern baldness. Women who respond well to the medication may see improvements in hair density and thickness.
Close up showing the before and after results of using latanoprost to treat hair loss and balding

Before and after results of using Latanoprost to treat hair loss.

How to Use Latanoprost

The application of latanoprost for hair loss typically involves topical use, as it is intended to be applied directly to the scalp. Here are general guidelines for applying:

  • Clean Scalp: Start with a clean and dry scalp. You can wash your hair with a mild shampoo and ensure that the scalp is free from excess oil, dirt, and debris.
  • Measure the Dose: Follow the dosing instructions provided by the manufacturer or supplier. Typically, a small amount of latanoprost solution is applied to the scalp.
  • Apply to Affected Areas: Use a dropper or applicator to apply the latanoprost solution directly to the areas of the scalp where you are experiencing hair loss or thinning. It’s important to target the areas where the hair follicles are sensitive to DHT.
  • Massage Gently: After applying the solution, use your fingertips to gently massage it into the scalp. This helps distribute the product evenly and stimulates blood flow to the follicles.
  • Allow to Dry: Allow the latanoprost solution to dry naturally. Avoid using a hair dryer or heat source to speed up the drying process, as this may reduce effectiveness.
  • Frequency of Use: The frequency of application can vary depending on the product and individual preferences. Most users apply latanoprost once daily.
  • Be Consistent: Consistency in application is essential for potential effectiveness. It may take several months of regular use to see any noticeable results, and individual responses can vary.
  • Monitor for Side Effects: Keep an eye out for any adverse reactions, such as skin irritation, redness, or itching. If you experience any significant or persistent side effects, discontinue use and consult a healthcare professional.


Latanoprost is typically provided in a sealed container as an ophthalmic solution. Proper storage is essential to maintain its stability and effectiveness. Here are guidelines for storing latanoprost:

  • Keep it Sealed: Ensure that the container is tightly sealed when not in use. This helps prevent contamination and evaporation of the solution.
  • Temperature: Store latanoprost at room temperature, ideally between 59°F to 86°F (15°C to 30°C). Avoid exposing it to extreme heat or cold, such as direct sunlight, freezing temperatures, or very hot environments.
  • Protect from Light: Latanoprost is sensitive to light, so store it in its original container and keep the container away from direct sunlight or intense artificial light.
  • Avoid Contamination: Do not touch the tip of the dropper or the inside of the bottle with your fingers or any surface to prevent contamination.
  • Refrigeration: Some manufacturers recommend storing unopened bottles of latanoprost in the refrigerator to prolong shelf life. Check the product labeling or consult your healthcare provider for specific storage instructions.
  • Do Not Freeze: Do not freeze latanoprost. Freezing can damage the medication.
  • Keep Out of Reach of Children: Store latanoprost in a safe location that is out of reach of children and pets.
  • Check Expiration Date: Always check the expiration date on the packaging and do not use latanoprost if it has expired.

Safety and Side Effects

Latanoprost is primarily used as an ophthalmic medication to treat glaucoma and ocular hypertension. When applied topically to the scalp for the off-label use of promoting hair growth, it may have side effects similar to those observed when used for its intended purpose in the eyes. However, the occurrence and severity of side effects may vary from person to person. Common side effects of latanoprost when applied topically to the scalp can include:

  • Scalp Irritation: Some individuals may experience scalp irritation, redness, itching, or a burning sensation at the application site. This can be temporary and typically subsides with continued use.
  • Darkening of Eyelashes and Skin: Latanoprost has been known to cause darkening of the eyelashes and the skin around the eyes in some individuals. When applied to the scalp, it might potentially lead to darkening of hair or skin in the treated area.
  • Change in Eye Color: Although this effect is more commonly associated with latanoprost when used in the eyes, it is theoretically possible that long-term topical use on the scalp could lead to a change in eye color, especially in individuals with light-colored eyes.
  • Systemic Absorption: While systemic absorption of latanoprost through the scalp is minimal compared to eye use, there is still some potential for the medication to enter the bloodstream. This could lead to side effects similar to those observed when latanoprost is used in the eyes, such as changes in blood pressure, heart rate, and respiratory effects.


Latanoprost, with its intriguing mechanism rooted in the prostaglandin pathway, presents a promising avenue in hair regrowth strategies. As researchers continue to unravel its potential and nuances, it may well find a firmer place in the armamentarium against hair loss. Further studies, particularly large-scale randomized trials, will be instrumental in shaping this narrative.


  • Johnstone MA, Albert DM. Prostaglandin-induced hair growth. Surv Ophthalmol. 2002;47 Suppl 1:S185-S202.
  • Blume-Peytavi U, et al. A randomized double-blind placebo-controlled pilot study to assess the efficacy of a 24-week topical treatment by latanoprost 0.1% on hair growth and pigmentation in healthy volunteers with androgenetic alopecia. J Am Acad Dermatol. 2012;66(5):794-800.
  • Stjernschantz J. From PGF2alpha-isopropyl ester to latanoprost: a review of the development of xalatan: the Proctor lecture. Invest Ophthalmol Vis Sci. 2001 Mar;42(6):1134-45.

Note: This piece serves as an informative overview. Individual responses may vary, and consultation with a qualified medical professional is indispensable before initiating any therapeutic regimen.

Check Out Latanoprost Hair Loss Treatments