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What is Finasteride?

Finasteride is recognized as a clinically successful therapy for the prevention and treatment of inherited hair loss. Finasteride works by blocking the conversion of the hormone testosterone to dihydrotestosterone (DHT).


Finasteride is recognized as a clinically successful therapy for the prevention and treatment of inherited hair loss.

How does Finasteride work?

The active ingredient in Finasteride is finasteride. This belongs to a group of medicines called Type II ‘5-alpha reductase inhibitors’. These medications work by blocking the action of 5-alpha-reductase which is the enzyme that converts testosterone into dihydrotestosterone. This results in increased levels of testosterone and decreased dihydrotestosterone. This treats male-pattern baldness as dihydrotestosterone causes the hair follicles to shrink. Eventually, the hair follicles get so small that they cannot replace lost hairs.

How do you take Finasteride?

Always take this medication as it has been prescribed to you by your doctor or pharmacist. Take one tablet daily at the same time. The tablet can be taken with or without food. The tablet should be taken whole and should not be broken or crushed.

How effective is Finasteride?

Finasteride is a clinically proven hair loss treatment used in male-pattern baldness.


It may take 3 to 6 months for the full effect to develop. It is important to keep taking Finasteride for as long as your doctor tells you to. If you stop taking Finasteride, you are likely to lose the hair you have gained in within 9-12 months.

What are the side effects of Finasteride?

Like all medicines, Finasteride can cause side effects. Not everybody will experience these side effects and they are typically mild to moderate in nature.  The most common side effects of Finasteride are:

  • Inability to develop or maintain an erection
  • Problems with ejaculation (such as reduced amount of ejaculatory fluid)
  • Decreased desire to have sex

For less common side effects, please see the patient information leaflet.

More Information
Dosage 1mg
Dosage Instructions ONE to be taken DAILY