Finasteride for hair loss: what it is and how it may work

What finasteride is and how it may work (DHT)

Finasteride is an oral prescription medicine associated with the treatment of male androgenetic alopecia (genetic-hormonal hair thinning). Its action relates to a hormone called dihydrotestosterone (DHT) – an androgen that, in genetically susceptible men, may contribute to the gradual miniaturisation of hair follicles.

Finasteride affects the enzyme that converts testosterone into DHT. By lowering DHT levels, the medicine may help slow further progression of thinning in some patients. It is important to understand that any effect is individual and not guaranteed – whether and how the medicine works depends on many factors and is assessed by a doctor.

This page does not contain dosing instructions. Dose, suitability and treatment course are decided only by a doctor after a thorough assessment. Want to understand the causes of hair loss? Read more about the diagnosis and treatment of hair loss causes.

Who finasteride may suit (men)

Finasteride is generally considered for adult men diagnosed with androgenetic alopecia. Suitability is always decided by a doctor, taking into account your health status, medical history, current medications and your expectations.

• The medicine is intended for men only, not women (see the safety section below).
• It is not suitable for all men – a doctor assesses possible contraindications and risks individually.
• Finasteride is not used for hair loss that is not androgenetic in cause, so an accurate diagnosis is essential.

Hair loss can have several causes and treatment options. In some cases a doctor may also discuss other approaches, such as PRP treatment as an adjunctive (supportive) method, or surgical solutions. Every plan is individual and can be discussed at a free consultation.

IMPORTANT SAFETY: side effects, contraindications and doctor monitoring

Finasteride is a serious prescription medicine with important safety considerations. Please read these carefully and discuss any questions with a doctor.

Possible sexual side effects. Some men may experience changes in sexual function, such as reduced libido, erectile difficulties or ejaculation problems. Mood changes have also been reported in some cases. These effects do not occur in everyone, but you should be aware of them and report them to your doctor.

NOT for women who are or may become pregnant. Finasteride is contraindicated in women, especially during pregnancy or when pregnancy is possible, because it may harm the development of a male foetus. Handling broken or crushed tablets can also pose a risk to women who are or may become pregnant – they should not touch such tablets. Women experiencing hair loss should seek other, doctor-recommended approaches.

Requires a doctor's prescription and monitoring. Finasteride must be used only when prescribed by a doctor, and regular medical monitoring is needed during treatment. A doctor will also consider that the medicine can affect the interpretation of certain blood tests (e.g. PSA). If treatment is stopped, any benefit gained may reverse.

Dosing. No dosing instructions are given on this page. The dose and regimen are determined only by a doctor. Never start, change or stop the medicine without consulting a doctor.