Minoxidil Spray has been a licensed treatment for male pattern baldness since the 1970s, making it one of the go-to treatments for hair loss. But if you’re looking into minoxidil today, you’ll notice there’s more than one way to use it.
The two most common options are 5% Minoxidil Spray (topical minoxidil) and oral minoxidil (capsules). While they contain the same active ingredient, they work slightly differently and come with different pros and cons.
Here’s what you need to know.
Absorption
Oral Minoxidil comes as a capsule that’s swallowed. The medication is absorbed into the bloodstream and so works across your whole system.
How it works
Regardless of how it’s taken, minoxidil works by:
- improving blood flow to hair follicles
- prolonging the growth (anagen) phase of the hair cycle
- helping miniaturised follicles grow thicker, stronger hairs
Topical minoxidil stimulates hair growth directly at the scalp, particularly in areas affected by male pattern baldness.
Oral minoxidil is though to reach the follicles via the bloodstream, which is why some people notice increased hair growth not just on the scalp, but elsewhere on the body too.
Side Effects
Side effects from topical minoxidil are usually localised to the scalp. The most common include:
- scalp irritation or itching
- dryness or flaking
- redness
These effects are generally mild and may improve with continued use once your scalp adjusts. For others, side effects might be caused by a sensitivity to one of the ingredients in the spray, an alcohol called propylene glycol. If that’s the case, foam versions are available which don’t contain this ingredient, so may be better tolerated.
Oral minoxidil
Because oral minoxidil works system‑wide, it has the potential for systemic side effects. These may include:
- unwanted hair growth on the face or body
- fluid retention
- changes in heart rate or blood pressure
Convenience
Minoxidil spray requires daily application to the scalp, usually twice-a-day in the morning and evening. It should always be applied to a dry scalp, as applying to wet hair/scalp can mean less of the active ingredient reaches the follicles.
Using oral minoxidil involves swallowing one capsule, once a day. There’s no mess, no styling considerations, and no risk of transferring the product onto pillows or hats.
Some people find the twice-daily regime of applying minoxidil spray can be hard to keep up with, which is one reason which drives interest in oral minoxidil.
Availability
Minoxidil Spray is a licensed hair loss treatment. This means it’s been formally approved by the regulatory body (HPRA in Ireland) to treat male pattern baldness at a specific strength in specific patient groups. A license for medication refers to the particular conditions (which illness, dosages, patient ages) it has been approved to treat. Minoxidil Spray can be bought over-the-counter online or in pharmacies, without a prescription.
Oral Minoxidil is unlicensed for hair loss. It’s officially licensed as a treatment for high blood pressure, but it can be prescribed off-label by a doctor or pharmacist to treat hair loss. Off-label just means that a licensed medication is being prescribed for a purpose, dosage, or patient age group not officially approved by regulatory bodies. In Oral Minoxidil this means it's not being used to treat high blood pressure - it's being taken to treat hair loss instead. Unlike Minoxidil Spray, it does require a prescription.
All of our blog articles are reviewed by our Medical Director before publication.
