What minoxidil is
Minoxidil is the most common over-the-counter drug for hair loss. It was originally a blood pressure pill. Doctors noticed patients growing extra hair, and a scalp version was created. Rogaine is the best-known brand, but generic versions work the same way.
The topical versions come in two forms: a liquid solution, usually 2 percent or 5 percent, and a 5 percent foam. The FDA approved the 5 percent foam for men in 2006 and for women in 2014.
Do they work equally well?
The active ingredient is the same, and the research says the results are about the same. A randomized trial published in the Journal of the American Academy of Dermatology in 2011 compared 5 percent foam once a day with 2 percent liquid twice a day in women and found the foam was at least as good.
Both forms take time. Most people see less shedding by month two to three and visible regrowth by month four to six. If you stop, the new hair falls out within a few months. This is a long-term treatment.
One thing both forms share is that they work better on the crown and top of the head than on a receding hairline. They also work best when hair loss is caught early, while follicles are still alive but shrinking. Once an area has been smooth and bald for years, no topical will bring it back.
The key difference: propylene glycol
The liquid uses propylene glycol to help minoxidil spread and soak in. Propylene glycol is also the main reason the liquid causes itching, redness and flaking in some people. Roughly 1 in 20 users gets noticeable scalp irritation from it.
The foam does not contain propylene glycol. If your scalp gets itchy or you have seborrheic dermatitis, the foam is usually the better pick.
Mess, drying time and feel
The liquid comes with a dropper. It runs, can drip onto your forehead and takes longer to dry. Some people like it because the dropper puts the drug right on the part lines.
The foam melts when it touches warm skin, dries in a few minutes, and does not run. It is easier to use on top of your head. It is a little harder to work into long, thick hair because it needs to reach the scalp, not sit on the hair.
Cost is similar for the 5 percent versions, and generics for both forms are widely sold. If you are using the 2 percent strength, liquid is usually the only option. Women are often started on 2 percent liquid twice a day or 5 percent foam once a day, and both are considered appropriate.
Which to pick
Choose the foam if you have a sensitive scalp, want a quick routine, or have had irritation from the liquid.
Choose the liquid if you want the cheapest option, like the precision of a dropper, or are using the 2 percent strength.
Either way, apply to a dry scalp, use the amount on the label, and wash your hands after. Do not expect more hair from using more product. Extra just runs off or gets on your pillow.
A third option: oral minoxidil
Low-dose minoxidil pills are now widely prescribed off-label for hair loss. Off-label means the FDA approved the pill for blood pressure, not hair, but doctors can prescribe it for hair when they judge it appropriate. The pill avoids the mess and scalp irritation entirely. It is not right for everyone, so a clinician needs to review your blood pressure and heart history.
Zen IV Spa offers oral minoxidil for $59 a month, a topical spray for $69, finasteride for $49, or the full hair program for $149. It starts with a free video visit with our medical director, and medications ship to you in New York and New Jersey. Visit /hair-loss/ to learn more.
Common Questions
Is foam or liquid minoxidil stronger?+
Neither. Both 5 percent products deliver the same drug. The liquid soaks in slightly differently because of propylene glycol, but results are similar in studies.
Can women use 5 percent minoxidil foam?+
Yes. The FDA approved 5 percent foam for women in 2014, used once a day.
Why does the liquid make my scalp itch?+
Most likely the propylene glycol. Switching to the foam usually solves it.
How long before I see results?+
Expect three to six months of daily use. Shedding often increases briefly in the first month as weak hairs make room for new growth.
Can I use minoxidil with finasteride?+
Yes. Many clinicians combine them because they work in different ways. Finasteride lowers the hormone that shrinks follicles, and minoxidil stimulates growth.
Sources: FDA Drug Facts labeling for Rogaine 5 percent foam and topical solution; Blume-Peytavi et al., Journal of the American Academy of Dermatology, 2011 randomized trial of foam versus solution; American Academy of Dermatology guidance on minoxidil.
All treatments are medical services. Every guest is screened, and every treatment is prescribed by a licensed provider. Nothing on this page is medical advice for you personally, and the opinions summarized here belong to the doctors named, not to Zen IV Spa. Talk to a provider before starting or stopping anything.
