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Propecia is a medication used to treat hair loss. It is especially useful at treating inherited hair loss. Propecia works by blocking the conversion of the hormone testosterone to dihydrotestosterone.
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What is Propecia?

Propecia is used for the treatment of male-pattern hair loss. Men with mild to moderate, but not complete hair loss, can benefit from using Propecia.

How does Propecia work?

The active ingredient in Propecia 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 helps to treat male-pattern baldness as dihydrotestosterone causes the hair follicles to shrink which prevents them from replacing lost hairs.

How do you take Propecia?

The recommended dose is one tablet each day. For maximum results, take the tablet at the same time each day. The tablet can be taken with or without food.

How effective is Propecia?

Propecia is a clinically proven way of treating baldness. However, it is really important that you take this medication as directed.


It may take 3 to 6 months for the full effect to develop. It is important to keep taking Propecia for the as long as it has been prescribed to you. Failure to take the entire course of this medication means that you are likely to lose the hair you have gained within 9 to 12 months.

What are the side effects of Propecia?

Like any medicines, Propecia can cause side effects. However, not everybody experiences them, and they are usually mild to moderate in nature. The most common side effects are:

  • Inability to have an erection
  • Decreased desire to have sex


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

More Information
Dosage 1mg
Dosage Instructions Take ONE tablet daily