By: Robin Lewallen, MD, FAAD
Minoxidil is one of the most effective and well-studied treatments for hair loss. Whether it’s applied directly to the scalp or taken as a pill, or injected into the scalp minoxidil can help many people slow hair loss and promote new hair growth.
If you’re considering minoxidil, here’s what you need to know.
What Is Minoxidil?
Minoxidil is a medication that helps extend the growth phase of the hair cycle, allowing hairs to grow longer, thicker, and stronger. It does not create new hair follicles, but it can improve the performance of follicles that are still alive.
Minoxidil is commonly used to treat:
- Female pattern hair loss
- Male pattern hair loss
- Chronic telogen effluvium (ongoing excessive shedding)
- Some patients with alopecia areata (as part of a treatment plan)
- Other forms of hair loss, depending on the diagnosis
Your dermatologist can determine whether minoxidil is appropriate for your specific type of hair loss.
Topical Minoxidil
Topical minoxidil is applied directly to the scalp and is available over the counter as a 2% or 5% solution or foam. For some patients, dermatologists may also prescribe compounded formulations, such as 6% or 7% minoxidil, sometimes combined with other medications depending on the type of hair loss.
Benefits
- FDA-approved for pattern hair loss
- Easy to obtain without a prescription
- Prescription compounds be combined with other prescription ingredients, including finasteride, dutasteride, spironolactone, tretinoin, or corticosteroids, depending on the diagnosis
- Minimal absorption into the bloodstream
- Effective for many patients when used consistently
Possible Side Effects
Most people tolerate topical minoxidil well, but side effects can include:
- Scalp irritation
- Itching or dryness
- Flaking
- Allergic contact dermatitis
- Unwanted facial hair growth from medication transferring to the face
Many patients who experience irritation with the liquid do better with the foam formulation. Note that the medication package insert will include a more comprehensive list of potential side effects.
Oral Minoxidil
Low-dose oral minoxidil (LDOM) is a prescription medication that has become increasingly popular for treating hair loss. Although it was originally developed as a blood pressure medication, much lower doses are now commonly prescribed by dermatologists for many forms of hair loss.
For some patients, oral minoxidil is easier to use because it eliminates the need for daily scalp application.
Benefits
- Convenient once-daily pill
- Avoids scalp irritation
- Helpful for patients who have difficulty applying topical medication
- May be effective even when topical treatment has been difficult to use consistently
Possible Side Effects
Like any medication, oral minoxidil has potential side effects. These may include:
- Increased hair growth on the face or body
- Mild ankle swelling
- Lightheadedness
- Increased heart rate or palpitations
- Headache
Most side effects are dose-dependent and improve with dose adjustment or discontinuation. Your dermatologist will review your medical history to determine whether oral minoxidil is a good option. Note that the medication package insert will include a more comprehensive list of potential side effects.
How Long Does It Take to Work?
Patience is important. Hair grows slowly.
Many patients notice:
- Increased shedding during the first 4–8 weeks (this is often temporary and can be a sign that older hairs are being replaced)
- Early improvement around 3–4 months
- More noticeable results after 6 months
- Maximum improvement after 9–12 months
Stopping treatment usually leads to gradual loss of the benefits depending on which condition is being treated.
Can Men and Women Use Minoxidil?
Yes. Both topical and oral minoxidil can be used in men and women, although treatment plans and doses may differ depending on the individual and the type of hair loss.
Can Minoxidil Be Combined With Other Treatments?
Yes. In many cases, the best results come from combining treatments. Depending on your diagnosis, your dermatologist may recommend minoxidil along with other therapies such as medications that reduce hormone-related hair loss, anti-inflammatory treatments, nutritional optimization when appropriate, or procedures such as platelet-rich plasma (PRP) injections.
Frequently Asked Questions
Will I lose my hair if I stop minoxidil?
Minoxidil helps maintain and improve existing hair growth. If treatment is stopped, hair typically returns to its previous state over several months to years.
Do I have to use it forever?
Hair loss conditions such as female and male pattern hair loss are ongoing conditions. Continued treatment is usually needed to maintain results.
Is the initial shedding normal?
Yes. Some people experience temporary increased shedding during the first several weeks of treatment. This usually improves as new hairs begin growing.
Is oral minoxidil better than topical minoxidil?
Not necessarily. Both treatments can be very effective. The best choice depends on your type of hair loss, medical history, lifestyle, and personal preferences. Many patients do well with topical therapy alone, while others may benefit from oral treatment or a combination of both.
The Bottom Line
Minoxidil remains one of the most effective treatments available for many types of hair loss. Whether used as a topical solution or a low-dose oral medication, it can slow hair loss and promote thicker, healthier hair when used consistently.
If you’re experiencing hair loss, the first step is obtaining the correct diagnosis. Once the cause is identified, your dermatologist can recommend whether topical minoxidil, oral minoxidil, or another treatment is the best option for you.
