Minoxidil is a popular medicine that helps people grow hair back. It’s often used in creams or liquids, and doctors recommend it for both men and women who are losing their hair. Some people see good results when they use it regularly, but others might get an itchy scalp.
Let’s talk about why this happens.
Minoxidil is a medication primarily used to treat hair loss and high blood pressure. It works by widening blood vessels and opening potassium channels, which increases blood flow and nutrient delivery to hair follicles. This promotes hair growth and helps prevent further hair loss.
There are two common forms of minoxidil: topical solutions and foams.
The topical solution is typically applied twice daily to the scalp, while the foam is easier to apply and dries faster. Both forms are available in different concentrations for men and women.
The FDA first approved minoxidil as an oral medication for high blood pressure in the 1970s. Later, it was approved as a topical treatment for hair loss in the 1980s.
Minoxidil has since become widely used for treating androgenetic alopecia (pattern hair loss) in both men and women.
13.8% of patients report experiencing an itchy scalp when using Minoxidil. Research suggests up to 9% of those who use topical Minoxidil for male pattern baldness or female pattern hair loss experience mild itchiness on their scalp. This can be as high as 60% of people with other types of hair loss.
In a study conducted by the University of Michigan Alopecia Clinic, 47 surveys were completed by new patients seeking evaluation for alopecia.
The study found that 13.8% of patients reported experiencing an itchy scalp when using Minoxidil.
Another study published in the Archives of Dermatological Research found that scalp pruritus was the most common side effect reported by participants using topical Minoxidil.
Patient testimonials also highlight this side effect. Many users on forums and review sites mention experiencing scalp itchiness, especially during the initial weeks or months of use.
Minoxidil might cause itching due to several reasons:
Allergic reactions: Some individuals may develop an allergic reaction to minoxidil itself or to other ingredients in the formulation, leading to itching.
Irritation from inactive ingredients: Ingredients like propylene glycol, commonly found in minoxidil solutions, can cause irritation and itching.
Drying effect of alcohol-based solutions: Alcohol in the solution can dry out the scalp, disrupting the skin’s moisture barrier and causing itchiness.
Switching to a foam formulation of minoxidil can help reduce scalp itch as it typically lacks propylene glycol, a common irritant. Using a gentle, hydrating shampoo 2-3 times a week can also soothe the scalp. For persistent itchiness, consider consulting a dermatologist who might recommend a topical steroid or a lower concentration of minoxidil.
Additionally, allowing the solution to air dry instead of covering your scalp can prevent further irritation.
Dermatologists have identified several causes for itchiness associated with minoxidil use. One common cause is irritation from an ingredient called propylene glycol found in many commercial minoxidil solutions. Another cause could be an exacerbation of underlying seborrheic dermatitis, or in some cases, a true allergy to minoxidil itself.
To manage this side effect, dermatologists recommend several strategies.
First, they suggest using minoxidil foam formulations, which do not contain propylene glycol and are less likely to cause itching. If switching to foam is not an option, they may prescribe minoxidil compounded in glycerin, water, and ethanol instead. Additionally, incorporating shampoos containing ketoconazole, zinc pyrithione, or selenium sulfide into the hair care routine can help manage underlying seborrheic dermatitis.
In more persistent cases, a topical steroid might be added to the treatment regimen. For some patients, oral minoxidil or reducing the concentration of minoxidil used (e.g., switching from 5% to 2%) can also be effective.
It’s important for patients experiencing persistent itchiness to consult with a healthcare professional for personalized guidance and treatment adjustments.
Minoxidil is a popular medication used to treat hair loss and high blood pressure by increasing blood flow and nutrient delivery to hair follicles. However, some users may experience scalp itchiness due to allergic reactions, irritation from inactive ingredients, or drying effects of alcohol-based solutions.
To manage this side effect, dermatologists recommend using minoxidil foam formulations, switching to a compounded solution in glycerin, water, and ethanol, or incorporating shampoos containing ketoconazole, zinc pyrithione, or selenium sulfide into the hair care routine. In persistent cases, a topical steroid may be added to the treatment regimen.
It is essential for patients experiencing scalp itchiness to consult with a healthcare professional for personalized guidance and treatment adjustments.