Finasteride per la calvizie maschile
Propecia
Revisione paritaria di Sid DajaniUltimo aggiornamento di Michael Stewart, MRPharmSUltimo aggiornamento 5 May 2025
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Finasteride is for adult men only - it must fare affidamento be taken by anyone aged under 18 years, or by women.
The dose is one (1 mg) tablet a day.
Side-effects are uncommon, but may include a loss of sex drive and a reduced ability to get an erection.
A colpo d'occhio
Finasteride is a medicine used to treat male pattern hair loss.
It works by stopping the conversion of testosterone into another hormone that shrinks hair follicles.
You take one tablet daily and may need to take it for up to a year to see the full benefit.
Finasteride is a prescription-only medicine and is not available on the NHS.
You must keep taking finasteride to maintain the benefits of treatment.
Some men experience side-effects like reduced sex drive, erection problems, or changes in mood.
Women who are pregnant should not handle finasteride tablets.
About finasteride for male pattern baldness
Tipo di medicinale | 5-alpha reductase inhibitor |
Utilizzato per | Male pattern hair loss |
Chiamato anche | Propecia® |
Disponibile come | Compresse |
Calvizie maschile is the common type of hair loss that develops in many men at some stage. The condition is sometimes called androgenetic alopecia. It is caused by a combination of hereditary (genetic) and hormonal factors.
Hair is made in hair follicles. A hair normally grows from each hair follicle for about three years. It is then shed and a new hair grows from the follicle. As balding develops, affected hair follicles gradually become smaller than normal. Each new hair that grows is thinner and shed more quickly than before. This eventually leads to a much smaller hair follicle and a thin hair that does not grow out to the skin surface.
Male hormones are involved in causing these changes. Hair follicles convert testosterone (the main male hormone) into another hormone called dihydrotestosterone. Affected hair follicles become more sensitive to dihydrotestosterone and this causes the hair follicles to shrink.
For some men, this normal ageing process can be distressing, particularly if it is excessive or occurs early in life. Treatment with finasteride can help prevent further hair loss. It works by stopping the conversion of testosterone to dihydrotestosterone.
Finasteride is only available on a prescription from a doctor, but it is not available on the NHS. This means you will be asked to pay the full price of the tablets when you receive your supply.
Before taking finasteride
Some medicines are not suitable for people with certain conditions, and sometimes a medicine can only be used if extra care is taken. For these reasons, before you start taking finasteride it is important that your doctor knows:
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How to take finasteride
Before you start the treatment, read the manufacturer's printed information leaflet from inside the pack. It will give you more information about finasteride and will provide you with a full list of the side-effects which you may experience from taking it.
Take one (1 mg) tablet each day, exactly as your doctor tells you to. Try to take your doses at the same time of day, as this will help you to remember to take finasteride regularly.
Swallow the tablet whole (without breaking or crushing it) with a drink of water. You can take the tablet either with or without food.
If you forget to take a dose on time, take it when you remember. If you do not remember until the following day, leave out the missed dose. Do not take two doses together to make up for a forgotten dose.
Ottenere il massimo dal tuo trattamento
Each time you collect a new supply of tablets from your pharmacy, make sure they look to be the same as you have had before. This is because there is a high-dose brand of finasteride tablet available for the treatment of a different condition. If you are unsure that you have the correct tablets, ask your pharmacist to check for you.
Your hair growth may start to improve within a few months, although it can take up to a year or so for you to notice the full benefit. You will need to continue treatment to maintain this effect, as the balding process returns when you stop.
Finasteride may cause harm to an unborn baby. Because of this, women who are pregnant should not handle the tablets. Also, very small amounts of finasteride will be in your semen while you are taking this medicine. If you need further advice about this, speak with your pharmacist or doctor.
If you are having an operation or any medical treatment, tell the person carrying out the treatment that you are taking finasteride. This is because finasteride can interfere with a blood test used to detect prostate cancer, so you must tell your doctor about taking finasteride if you need this test.
Can finasteride cause problems?
Along with their useful effects, most medicines can cause unwanted side-effects although not everyone experiences them. The table below contains some of the ones associated with finasteride. You will find a full list in the manufacturer's information leaflet supplied with your medicine. The unwanted effects often improve as your body adjusts to the new medicine, but speak with your doctor or pharmacist if any of the following continue or become troublesome.
Finasteride side-effects (these affect fewer than 1 in 10 men) | Cosa posso fare se sperimento questo? |
Reduced desire to have sex, inability to get an erection, breast tenderness, depressed mood, allergic-type reactions | Se uno di questi diventa problematico, parla con il tuo medico |
Importante: if you develop any pain or lumps in your breast area, or any discharge from your nipples, you should tell your doctor. This is because there have been a few rare reports of breast cancer in men taking 5-alpha reductase inhibitors like finasteride and dutasteride.
Importante: there have been reports of depression in men taking finasteride, and in rare cases, thoughts of self-harming. Patient alert cards are now included with your medicine alerting you to this fact. You should share this information with your family or friends so that they can be alert for any changes in your mood. If you develop any segni della depressione whilst being treated with finasteride, or you have any concerns about your mood, make an appointment to see your doctor.
If you are taking finasteride for prostate problems, you should continue to take your medication until you have spoken with your doctor and agreed a plan.
If you are taking finasteride (Propecia) for male pattern baldness, you should stop taking this medication and make an appointment to see your doctor.
In addition, taking finasteride has caused problems with sexual function in some men, including loss of libido and problems maintaining an erection. This has sometimes continued after stopping treatment. Speak with your doctor if you are concerned about this.
Se si verificano altri sintomi che ritieni possano essere dovuti alle compresse, parla con il tuo medico o farmacista per ulteriori consigli.
How to store finasteride
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Domande frequenti
Why is finasteride not available on the NHS for male pattern baldness?
Finasteride is a prescription-only medicine but it is not funded by the NHS for treating male pattern baldness. This means patients need to pay the full cost of the tablets when they get their supply.
What is dihydrotestosterone and how does it relate to hair loss?
Dihydrotestosterone is a hormone that hair follicles become sensitive to as balding develops. This sensitivity causes the hair follicles to shrink, leading to thinner hair that is shed more quickly. Finasteride works by blocking the conversion of testosterone into dihydrotestosterone.
When should I tell my doctor that I am taking finasteride?
You should inform your doctor or any medical professional about your finasteride use if you are having an operation or any medical treatment. It's particularly important to mention if you need a blood test for prostate cancer, as finasteride can interfere with the results of this test.
What should I do if I experience changes in mood or signs of depression while taking finasteride?
There have been reports of depression, and in rare cases, thoughts of self-harming, in men taking finasteride. Your medicine comes with a patient alert card about this. You should share this information with family or friends so they can help monitor your mood. If you notice any signs of depression or have concerns about your mood, stop taking the medication and schedule an appointment to see your doctor.
Are there any specific situations where women should avoid handling finasteride tablets?
Yes, women who are pregnant should not handle finasteride tablets because the medicine may cause harm to an unborn baby.
Ulteriori letture e riferimenti
- Manufacturer's PIL, Propecia® 1 mg tablets; Merck Sharp & Dohme Limited. The electronic Medicines Compendium. Dated August 2024.
- Medicinali Completi BNF 89ª Edizione; Associazione Medica Britannica e Società Farmaceutica Reale di Gran Bretagna, Londra.
Informazioni sull'autoreVisualizza il profilo completo

Michael Stewart, MRPharmS
Responsabile Revisione Foglietti Illustrativi – Contrattista, Farmacista
BPharm (Hons), MRPharmS
Michael è un farmacista comunitario che esercita nelle Midlands e nel South Yorkshire con oltre 20 anni di esperienza nel consigliare su farmaci e condizioni mediche. Ha una solida esperienza nella formazione sanitaria, avendo prodotto e tenuto corsi di formazione per team di farmacia e personale di strutture di assistenza residenziale, inclusi infermieri. Ha anche contribuito a consigli consultivi farmaceutici per la gestione di condizioni a bassa gravità nella comunità.
Informazioni sul recensore

Sid Dajani
Sultan Dajani si è laureato alla London School of Pharmacy nel 1994 ed è diventato il più giovane membro eletto del consiglio della Royal Pharmaceutical Society dalla sua fondazione nel 1842.
Storia dell'articolo
Le informazioni su questa pagina sono scritte e revisionate da clinici qualificati.
Articolo disponibile anche in Inglese, Tedesco, Spagnolo, Francese, Italiano, Portoghese, Hindi, Ebraico, Arabo, and Svedese.
Next review due: 5 May 2028
5 May 2025 | Ultima versione

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