Propecia

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Propecia on Prescriptsy

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Propecia is a branded prescription medicine containing finasteride 1 mg, licensed in the United Kingdom for the treatment of male pattern hair loss (androgenetic alopecia) in men aged 18 to 41 years.

Androgenetic alopecia is the most common form of hair loss in men, affecting approximately 50% of men by the age of 50 and up to 80% by the age of 70.

It presents as progressive thinning at the vertex (crown) and recession of the frontal hairline, following a characteristic pattern first described by Hamilton and later modified by Norwood.

Propecia is the only oral prescription medicine specifically licensed for this indication in the UK.

This page provides a comprehensive clinical overview of Propecia, including how finasteride works, clinical evidence for its effectiveness, correct dosing, side effects, important safety warnings, and how to obtain a prescription in the UK.

It is written by Dr. Claire Phipps for patients who have been prescribed Propecia or who are considering treatment for hair loss.

Important safety information about Propecia

Before reading further, note the following key safety points about Propecia.

• Propecia is for men only. It must not be taken by women or children.
• Pregnant women or women who may become pregnant must not handle crushed or broken Propecia tablets, as finasteride can be absorbed through the skin and may cause birth defects in a male foetus.
• Finasteride reduces PSA levels by approximately 50%. Inform your clinician if you undergo prostate cancer screening.
• If you experience persistent sexual side effects, mood changes, breast lumps, or breast pain, stop Propecia and consult your GP.

What is androgenetic alopecia

Androgenetic alopecia (male pattern hair loss) is a genetically determined, androgen-dependent condition characterised by progressive miniaturisation of scalp hair follicles.

It is the most common cause of hair loss in men and can begin as early as the late teens.

The condition is driven by dihydrotestosterone (DHT), a potent androgen formed by the action of the enzyme 5-alpha reductase on testosterone within hair follicle cells.

In genetically predisposed follicles, DHT shortens the anagen (growth) phase of the hair cycle and triggers a gradual transformation of thick, pigmented terminal hairs into fine, unpigmented vellus hairs.

Over time, affected follicles produce progressively thinner and shorter hairs until they cease producing visible hair altogether.

The genetic susceptibility to androgenetic alopecia is polygenic, involving variations in the androgen receptor gene on the X chromosome and other loci on autosomes.

The pattern of hair loss typically follows the Norwood-Hamilton classification, progressing from frontal recession and vertex thinning to more extensive loss, ultimately sparing only a horseshoe-shaped fringe of hair at the sides and back of the scalp.

These occipital and temporal follicles lack the sensitivity to DHT that characterises affected follicles.

Psychological impact of hair loss

While androgenetic alopecia is not a medical threat, its psychological impact can be substantial.

Research shows that men experiencing hair loss may suffer reduced self-esteem, increased social anxiety, depression, and impaired quality of life.

The visibility of hair loss, particularly in younger men, can affect personal relationships, professional confidence, and overall wellbeing. Effective treatment can improve both hair density and psychological outcomes.

How Propecia works: mechanism of action

Finasteride 1 mg is a competitive and specific inhibitor of the type II isoenzyme of 5-alpha reductase.

This enzyme is responsible for converting testosterone to DHT in the hair follicle dermal papilla cells, the prostate, seminal vesicles, epididymides, and liver.

Type II 5-alpha reductase is the predominant isoenzyme in the hair follicle, making it the principal therapeutic target for androgenetic alopecia.

By inhibiting type II 5-alpha reductase, finasteride 1 mg reduces serum DHT levels by approximately 70% and scalp DHT levels by approximately 60 to 70%.

This reduction in local DHT halts the progressive miniaturisation of susceptible follicles, stabilising hair loss in the majority of men.

In many cases, partial reversal of miniaturisation occurs, with vellus hairs transitioning back toward intermediate or terminal hairs.

This process produces visible thickening and increased coverage, most notably at the vertex and anterior mid-scalp.

Finasteride does not affect the type I isoenzyme of 5-alpha reductase (which predominates in the skin and liver) and does not bind to the androgen receptor.

It has no androgenic, anti-androgenic, oestrogenic, or progestational activity. Serum testosterone levels may increase slightly but remain within the normal physiological range.

Clinical evidence for Propecia

The efficacy of finasteride 1 mg for androgenetic alopecia was established in two pivotal randomised, double-blind, placebo-controlled trials involving over 1,500 men aged 18 to 41 years with mild to moderate vertex and anterior mid-scalp hair loss.

These trials demonstrated the following results over 2 years of treatment.

In the vertex area, finasteride-treated men showed a mean increase in hair count of approximately 107 hairs per one-inch diameter circle at 2 years, compared with a mean decrease of 101 hairs in the placebo group.

Investigator and patient assessments consistently rated finasteride-treated men as showing visible improvement.

At 2 years, 83% of men taking finasteride maintained or increased hair count, compared with 28% of men taking placebo.

Five-year extension data showed sustained benefit, with 90% of finasteride-treated men showing visible improvement or no further loss compared with baseline photographs.

The greatest benefits were observed at the vertex, with more modest results at the frontal hairline.

Finasteride is less effective for hair loss at the temporal regions and does not promote regrowth of hair that has been completely lost for many years.

Dosage and administration

The recommended dose is one Propecia 1 mg tablet taken once daily, with or without food.

There is no evidence that higher doses provide additional benefit for hair loss.

Treatment must be taken continuously; if stopped, the beneficial effects reverse within 6 to 12 months as scalp DHT levels return to pre-treatment concentrations.

Patients should be counselled that visible improvement typically takes 3 to 6 months to become apparent, and maximum benefit may not be seen until 12 to 24 months.

An initial increase in hair shedding during the first weeks of treatment is common and reflects the accelerated cycling of telogen hairs as new anagen growth begins.

This is not a cause for concern and does not indicate treatment failure.

If no improvement is observed after 12 months of daily use, continued treatment is unlikely to be beneficial and your prescriber may advise stopping.

No dose adjustment is required for patients with mild to moderate renal impairment. There are insufficient data to make dosing recommendations for patients with hepatic impairment.

Side effects of Propecia

Sexual side effects

The most commonly reported adverse effects of finasteride 1 mg are sexual in nature.

In the two pivotal clinical trials, the following rates were observed: decreased libido occurred in 1.8% of finasteride-treated men versus 1.3% on placebo; erectile dysfunction occurred in 1.3% versus 0.7% on placebo; and ejaculation disorders (including reduced ejaculate volume) occurred in 1.2% versus 0.7% on placebo.

These effects were generally mild, reversible upon discontinuation, and in some cases resolved during continued treatment.

Post-marketing reports of persistent effects

Since market authorisation, post-marketing reports have described sexual dysfunction (reduced libido, erectile dysfunction, ejaculation disorder) persisting after discontinuation of finasteride.

The MHRA has reviewed these reports and included warnings in the product information. The frequency, causality, and mechanism of persistent post-finasteride sexual dysfunction remain subjects of scientific investigation.

Patients should be informed of this potential risk before starting treatment.

Other side effects

Depressed mood and anxiety have been reported. Breast tenderness or enlargement (gynaecomastia) occurs uncommonly. Testicular pain has been reported rarely.

Hypersensitivity reactions including rash, pruritus, urticaria, and angioedema are rare.

Male breast cancer has been reported in post-marketing surveillance, although a causal relationship with finasteride has not been established.

When to seek medical advice

Stop Propecia and consult your GP if you experience persistent sexual dysfunction, persistent low mood or anxiety, thoughts of self-harm, breast lumps, breast pain, or nipple discharge.

Contact NHS 111 or attend A&E if you experience signs of a severe allergic reaction such as facial swelling, throat tightness, or difficulty breathing.

Report any suspected adverse reactions via the MHRA Yellow Card scheme at yellowcard.mhra.gov.uk .

Warnings and precautions

Women and children

Propecia is not indicated for use in women or children.

Finasteride is classified as a teratogen: exposure during pregnancy can cause abnormalities of the external genitalia in a developing male foetus (hypospadias).

Pregnant women must not handle crushed or broken tablets. Intact film-coated tablets are safe to handle provided the coating is not broken.

Men whose female partners are pregnant or planning pregnancy should either discontinue finasteride or use a condom during intercourse to prevent semen exposure.

Effect on PSA

Finasteride reduces serum PSA by approximately 50% in men taking 1 mg daily.

If you undergo PSA testing for prostate cancer screening, the measured value must be doubled for meaningful comparison with normal reference ranges.

This adjustment maintains the sensitivity of PSA testing for cancer detection.

Mood and mental health

Post-marketing reports have described depressed mood, anxiety, and, rarely, suicidal thoughts in men taking finasteride.

A causal relationship has not been established, but patients should be aware of this potential association. If you experience new or worsening mood symptoms, contact your GP promptly.

Blood donation

Men taking Propecia should not donate blood during treatment and for at least one month after stopping, to prevent finasteride-containing blood from being administered to a pregnant recipient.

How to get a Propecia prescription in the UK

Propecia is a prescription-only medicine (POM) in the UK.

To obtain a prescription, you can consult your GP, a dermatologist, or an authorised online prescriber registered with the General Pharmaceutical Council (GPhC).

A clinical assessment will confirm the diagnosis of androgenetic alopecia and exclude other causes of hair loss before a prescription is issued.

Generic finasteride 1 mg tablets, which are bioequivalent to Propecia, are also available and are generally less expensive. Your prescriber or pharmacist may offer a generic alternative.

The standard NHS prescription charge in England is currently 9.90 pounds per item; prescriptions are free in Scotland, Wales, and Northern Ireland.

Private prescriptions are available through online services and may offer convenience for men who prefer not to discuss hair loss during a face-to-face consultation.

Complementary and alternative treatments for hair loss

Topical minoxidil (marketed as Regaine in the UK) is available over the counter in 2% and 5% formulations.

It is applied directly to the scalp twice daily (for 2%) or once daily (for 5% foam) and promotes hair growth by a mechanism that is not fully understood but involves vasodilation and prolongation of the anagen phase.

Some men use minoxidil in combination with finasteride for a dual-action approach.

Other treatments for androgenetic alopecia include low-level laser therapy devices, platelet-rich plasma (PRP) injections, and hair transplant surgery.

Discuss all options with your clinician to determine the most appropriate approach for your situation.

When to seek urgent medical advice

Contact your GP promptly if you notice breast lumps, breast pain, or nipple discharge while taking Propecia, as these require clinical evaluation.

Seek urgent medical advice if you experience persistent low mood, anxiety, or thoughts of self-harm.

Call 999 or attend A&E if you develop signs of a severe allergic reaction including facial swelling, throat tightness, wheezing, or difficulty breathing.

Report any suspected adverse reactions via the MHRA Yellow Card scheme at yellowcard.mhra.gov.uk .

Sources

• Propecia 1 mg film-coated tablets, Summary of Product Characteristics (EMC)
• Finasteride, British National Formulary (BNF)
• NICE CKS: Alopecia, androgenetic
• Hair loss, NHS
• Male pattern hair loss, British Association of Dermatologists
• MHRA Yellow Card Scheme