Medicines & Supplements A to Z > Minoxidil


Last updated on 19/03/2021.

Overview   |   Dosage   |    Side Effects   |   Precautions  |   Tips  |   Where To Buy  

GENERIC NAME: Minoxidil 


BRAND NAME(S) IN HONG KONG: Hairgrow 客高生髮靈, Hudson Moxidil Solution 哈紳生髮水, Regaine, Regro

DRUG CLASS: Topical skin product for alopecia 

USED FOR: Hair loss of the scalp


– 2%, 3%, 5% w/v (topical solution)
– 5% (topical lotion)
– 5% w/w (topical foam)

What is Minoxidil for?

Minoxidil is a vasodilator that can be used to treat hair loss / baldness. It works by dilating the blood vessels and hence more blood can reach the hair follicles, increasing the size of hair follicles and in turn stimulating the hair growth.

How to use it?

Minoxidil is available as various forms to be applied to the hair scalp.

For males, if you are using 2% / 5% solution, you should apply 1 mL to the scalp twice daily. If you are using 5% foam / aerosol, you should apply 0.5 capful to the scalp twice daily.

For females, if you are using 2% solution, you should apply 1mL to the scalp twice daily. If you are using 5% foam / aerosol, you should apply 0.5 capful to the scalp once daily.

What are the side effects of Minoxidil?

Common side effects of Minoxidil include changes in hair colour or texture, itchiness, contact dermatitis, burning sensation, and flushing.

Who should not take Minoxidil?

People with hair loss that is sudden, patchy or after childbirth.

Pharmacist Tips:

– Massage the drug into the scalp with fingers.
– Wash hands after application.
– Long-term treatment is necessary for the effect to become apparent. Most patients will need at least 4 months for hair growth, but response varies widely.
– You need to use Minoxidil continuously. Hair loss will occur after stopping using the product.
– Inform your healthcare provider if you experience chest pain, increased heartbeat or dizziness after use.

Common dosing schedule:
Use minoxidil as per product instructions.

This schedule is for reference only, adjustments may be made according to individual needs.

Some common medications Minoxidil may interact with:

Please notify your doctor or pharmacist if you are taking the above medication, dosage adjustments might be needed.

Where to buy Minoxidil in Hong Kong?

In Hong Kong, Minoxidil is an over-the-counter medicine which can be purchased without a prescription in a pharmacy by speaking with the pharmacist. It can also be obtained from doctors. To find a pharmacy near you, refer to the list of pharmacies (“Authorized Sellers of Poisons”) from the Hong Kong Department of Health. 

For more information about drug names and ingredients, you can visit Hong Kong’s Drug Office at

Need more information?

For detailed information about the use of Minoxidil in children, pregnancy and breastfeeding, and for questions about drug interactions, please check with your pharmacist or doctor.

Disclaimer: our goal is to provide you with the most relevant drug information and common dosage for Hong Kong. This information does not constitute medical advice. For specific treatment recommendations and advice, always discuss with your doctor or pharmacist, and follow the instructions included with your specific medicine.