Finasterida para aumento da glândula prostática
Proscar
Revisado por Sid DajaniÚltima atualização por Michael Stewart, MRPharmSÚltima atualização 16 de maio de 2024
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Finasteride is for men only. It must not be taken by women, children or adolescents.
Take one tablet each day.
Your symptoms may start to improve within a few weeks, although it can take up to six months for you to notice the full benefit.
Em resumo
Finasteride is a medicine used to treat an enlarged prostate gland in men.
It works by shrinking the prostate, helping you pass urine more easily.
Take one tablet daily, at the same time each day, with or without food.
It can take up to six months to feel the full benefit of the treatment.
Pregnant women should not handle the tablets due to potential harm to an unborn baby.
Discuss any side-effects, such as reduced sex drive, with your doctor.
Rarely, finasteride has been linked to breast cancer and depression in men.
About finasteride
Tipo de medicamento | 5-alpha reductase inhibitor |
Usado para | Enlargement of the prostate gland in men |
Também chamado de | Proscar® |
Disponível como | Comprimidos |
The prostate gland commonly becomes larger in older men. O aumento da glândula prostática também é chamado de hiperplasia prostática benigna (HPB). The prostate gland is situated close to the bladder, so its enlargement can cause problems with passing urine. Common symptoms that are experienced are having to wait before your urine starts to flow, taking longer at the toilet, dribbling urine, and a feeling that your bladder is not quite empty.
Finasteride works by blocking the conversion of the hormone testosterone to the more potent hormone dihydrotestosterone. It does this by blocking an enzyme called 5-alpha reductase. Dihydrotestosterone is partly responsible for making the prostate enlarge. Therefore, a reduced amount of dihydrotestosterone in the prostate causes it to shrink. This helps you to pass urine more easily.
Small doses of finasteride are prescribed for men with hair loss. A completely different brand of finasteride tablet is prescribed for men with this condition. There is more information about the tablets used for this in a medicine leaflet called Finasterida para calvície masculina.
Before taking finasteride
Some medicines are not suitable for people with certain conditions, and sometimes a medicine may only be used if extra care is taken. For these reasons, before you start taking finasteride it is important that your doctor knows:
Se você já teve uma reação alérgica a um medicamento.
Se você estiver tomando ou usando qualquer outro medicamento. Isso inclui quaisquer medicamentos que você esteja tomando e que estejam disponíveis para compra sem receita médica, bem como medicamentos fitoterápicos e complementares.
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 finasteride exactly as your doctor tells you to. Take one 5 mg tablet each day.
You can take the tablet either before or after a meal, but try to take it at the same time of day each day. This will help you to remember to take your doses regularly.
If you forget to take a dose on time, take it when you remember. If you do not remember until the following day, skip the missed dose. Do not take two doses together to make up for a forgotten dose.
Obtendo o máximo do seu tratamento
Your symptoms may start to improve within a few weeks although it can take up to six months for you to notice the full benefit. This is because it takes time for the prostate gland to gradually shrink. Because of this, it is important that you continue to take the tablets regularly, even if you don't feel a benefit straightaway.
Remember to keep your regular appointments with your doctor. This is so your doctor can check on your progress.
Consider reducing or stopping the amount of caffeine you drink (commonly found in tea, coffee and cola) and alcohol. These can make your symptoms worse, so drinking less of these things may benefit you.
If you are a smoker, stopping smoking may significantly improve your symptoms. This is because nicotine irritates the bladder. Ask your doctor for advice on quitting.
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 low-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.
Finasteride may cause harm to an unborn baby. Because of this, women who are pregnant should not handle the tablets. Also, small amounts of finasteride will be in your semen while you are taking this medicine, and it is therefore recommended that you use a barrier method of contraception (such as a condom) if your partner could become pregnant. 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 it 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 most common 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.
Common finasteride side-effects (these affect fewer than 1 in 10 men) | O que posso fazer se passar por isso? |
Reduced desire to have sex, inability to get an erection, breast tenderness | Se algum desses se tornar problemático, fale com seu médico |
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 sinais de depressão 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 você sentir quaisquer outros sintomas que acha que podem ser devido ao medicamento, fale com seu médico ou farmacêutico para mais conselhos.
How to store finasteride
Mantenha todos os medicamentos fora do alcance e da vista das crianças.
Armazene em local fresco e seco, longe de calor e luz diretos.
Informações importantes sobre todos os medicamentos
Informações importantes sobre todos os medicamentos
Nunca tome mais do que a dose prescrita. Se suspeitar que você ou outra pessoa possa ter tomado uma overdose deste medicamento, vá ao departamento de acidentes e emergências do hospital local. Leve o recipiente com você, mesmo que esteja vazio.
If you buy any medicines, always check with a pharmacist that they are safe to take alongside your prescribed medicines.
Este medicamento é para você. Nunca o dê a outras pessoas, mesmo que a condição delas pareça ser a mesma que a sua.
Não guarde medicamentos vencidos ou indesejados. Leve-os à sua farmácia local, que se encarregará de descartá-los para você.
Se você tiver alguma dúvida sobre este medicamento, pergunte ao seu farmacêutico.
Relatar efeitos colaterais de um medicamento ou vacina
Se você sentir efeitos colaterais, pode relatá-los online através do Site do Yellow Card.

Inseguro sobre misturar medicamentos?
Verifique possíveis interações entre medicamentos, suplementos e alimentos antes de tomá-los juntos.
Perguntas frequentes
Can I stop taking finasteride for enlarged prostate once my symptoms improve?
It is important that you continue to take finasteride regularly, even if your symptoms improve. Your doctor will monitor your progress and advise on the duration of treatment. Do not stop taking your medication until you have spoken with your doctor and agreed a plan.
How long will I need to take finasteride for prostate enlargement?
The article does not specify a duration of treatment for finasteride. It mentions that it can take up to six months to notice the full benefit and that you should keep regular appointments with your doctor to check your progress. Your doctor will advise you on how long you need to continue taking the medication.
Are there any lifestyle changes I can make to help my prostate symptoms while taking finasteride?
Yes, you can consider reducing or stopping caffeine, alcohol, and smoking. Caffeine and alcohol can worsen bladder symptoms, and nicotine irritates the bladder. Discussing quitting smoking with your doctor may also help improve your symptoms.
Why is it important for pregnant women not to handle finasteride tablets?
Finasteride may cause harm to an unborn baby. Therefore, women who are pregnant should not handle the tablets to avoid any potential exposure.
Can finasteride affect my blood tests for prostate cancer?
Yes, finasteride can interfere with a blood test used to detect prostate cancer. It is important to inform the person carrying out any medical treatment or testing that you are taking finasteride.
What should I do if I feel depressed or have concerns about my mood while taking finasteride?
There have been reports of depression and, in rare cases, thoughts of self-harm in men taking finasteride. Patient alert cards are included with the medicine to highlight this. You should share this information with family or friends so they can be alert to changes in your mood. If you develop any signs of depression or have concerns about your mood, make an appointment to see your doctor.
Leitura adicional e referências
- Manufacturer's PIL, Proscar® 5 mg film-coated Tablets; Organon Pharma (UK) Limited, The electronic Medicines Compendium. Dated October 2023.
- Medicamentos Completo BNF 89ª Edição; Associação Médica Britânica e Sociedade Real de Farmácia da Grã-Bretanha, Londres.
Sobre o autorVer biografia completa

Michael Stewart, MRPharmS
Gerente de Revisão de Folhetos de Medicamentos – Contratado, Farmacêutico
BPharm (Hons), MRPharmS
Michael é um farmacêutico comunitário atuando nas Midlands e em South Yorkshire, com mais de 20 anos de experiência em aconselhamento sobre medicamentos e condições médicas. Ele tem uma sólida formação em treinamento em saúde, tendo produzido e ministrado cursos de treinamento para equipes de farmácia e funcionários de ambientes de cuidados residenciais, incluindo enfermeiros. Ele também contribuiu para conselhos consultivos de farmácia para o manejo de condições de baixa gravidade na comunidade.
Sobre o revisor

Sid Dajani
Sultan Dajani se formou na Escola de Farmácia de Londres em 1994 e se tornou o membro mais jovem eleito para o conselho da Sociedade Real de Farmácia desde sua fundação em 1842.
Histórico do artigo
As informações nesta página são escritas e revisadas por clínicos qualificados.
Artigo também disponível em Inglês, Alemão, Espanhol, Francês, Italiano, Português, Hindi, Hebraico, Árabe, e Sueco.
Próxima revisão agendada: 17 de abr de 2027
16 de maio de 2024 | Última versão

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