Comprimidos de Lofexidina
BritLofex, Lucemyra
Revisado por Sid DajaniÚltima atualização por Michael Stewart, MRPharmSLast updated 11 Fev 2025
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Nota do autor clínico Michael Stewart 01/03/2022: BritLofex® tablets were discontinued in the UK in October 2018. At the time of review there are no branded or generic products containing lofexidine available in the UK. Lofexidine may still be available in other countries. This medicine leaflet is based on medical information available in the UK at the time of writing and is left here for reference purposes. Please also refer to the manufacturer's information supplied with your medicine.
It is usual to take four tablets over the first day. Your dose will then be increased over the next few days to suit your needs. A course of treatment usually lasts 7-10 days.
The main side-effects are dizziness, dry mouth and feeling sleepy.
At the end of your treatment your dose will be reduced gradually over a few days. Do not stop taking lofexidine suddenly, as this can cause your blood pressure to rise suddenly which could be harmful.
At a glance
Lofexidine is a medicine used to reduce withdrawal symptoms during opioid detoxification.
It can help reduce chills, sweating, stomach cramps, muscle pain, and sleep difficulties.
You must take lofexidine exactly as your doctor tells you as part of a detoxification programme.
Do not stop taking lofexidine suddenly; your doctor will tell you how to reduce the dose gradually.
Common side-effects include feeling dizzy or sleepy, dry mouth, slow heart rate, and low blood pressure.
Avoid alcohol while taking lofexidine as it can worsen side-effects like sleepiness.
Regular monitoring of your blood pressure and pulse rate will be necessary during treatment.
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About lofexidine
Tipo de medicamento | An alpha-adrenergic agonist medicine |
Usado para | Reducing withdrawal symptoms during opioid detoxification (such as heroin, morphine or dihydrocodeine detox) |
Também chamado de | Lucemyra® (USA), BritLofex® (UK - discontinued) |
Disponível como | Comprimidos |
Lofexidine is a treatment for opioid drug dependence. Medicines for drug dependence are mainly used to reduce or prevent withdrawal symptoms while trying to break drug use.
Lofexidine is usually used alongside, but sometimes instead of, other medicines taken for opioid drug dependence such as methadone or buprenorphine. It helps to reduce withdrawal effects such as chills, sweating, stomach cramps, muscle pain, difficulties sleeping and runny nose.
Before taking lofexidine
Voltar ao conteúdoSome 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 lofexidine it is important that your doctor knows:
Se você está grávida ou amamentando.
If you have a heart condition, or if you have had a heart attack, or if you have a heart rhythm problem such as a slow or irregular heartbeat.
Se você tem pressão baixa.
If you have had a stroke or 'mini-stroke' (also known as a transient ischaemic attack, or TIA).
If you are feeling depressed.
Se você tiver algum problema com o funcionamento dos seus rins.
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.
Se você já teve uma reação alérgica a um medicamento.
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How to take lofexidine
Voltar ao conteúdoLofexidine is used as part of a detoxification programme. Because each programme is tailored to meet a person's individual needs and no two detoxifications are exactly the same, it is important that you take lofexidine exactly as your doctor tells you to.
Before you start the treatment, read the manufacturer's printed information leaflet from inside the pack. It will give you more information about lofexidine, and will also provide you with a full list of the side-effects which you could experience from taking it.
Your doctor or community drug-team worker will tell you when and how often to take the tablets. It is likely that you will be asked to take four tablets over the course of the first day. Take your last dose of the day at bedtime, as this will help to reduce any problems you may have sleeping. Your dose may then be increased over the next few days. The maximum number of tablets you will be prescribed to take at any one time is 4, and the maximum number of tablets during any one day is 12.
You can take lofexidine tablets either before or after meals. Swallow the tablets whole with a drink of water.
If you forget to take a dose, take it as soon as you remember and then continue as before. Do not take two doses together to make up for a missed dose.
It is usual to take lofexidine for around 7-10 days, although sometimes a course of treatment can be for longer than this. You should not stop taking lofexidine suddenly, as this can cause your blood pressure to rise quickly which could be harmful. At the end of the treatment, your doctor will ask you to reduce your dose gradually over a few days to prevent this from happening.
Obtendo o máximo do seu tratamento
Voltar ao conteúdoIt is important that you keep your regular appointments with your doctor/clinic so that your progress can be reviewed. Your blood pressure and pulse rate will need to be regularly monitored (especially in the first few days) to make sure you are taking a dose which helps your condition but avoids unwanted symptoms.
Lofexidine will help you to deal with withdrawal symptoms but it will not help you through cravings. You are more likely to succeed in breaking your drug habit if you have support and counselling. Local drug community teams, self-help groups and other agencies can be of help. It is much harder to 'do it alone', so go for counselling and help if it is available in your area. Try to stay positive and relaxed, drink plenty of fluids, and eat a light diet.
You should not drink alcohol while you are on lofexidine because it can increase side-effects such as feeling sleepy or dizzy.
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Can lofexidine cause problems?
Voltar ao conteúdoAlong with their useful effects, most medicines can cause unwanted side-effects although not everyone experiences them. The table below contains the most common ones associated with lofexidine. 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.
Very common lofexidine side-effects (these affect more than 1 in 10 people) | O que posso fazer se passar por isso? |
Sentindo-se tonto ou sonolento | If you feel dizzy, sit down for a while until you feel better. It is important you do not drive and do not use tools or machines while affected. Do not drink alcohol |
Dry mouth and throat | Tente mascar chiclete sem açúcar ou chupar balas sem açúcar |
Slow heart rate, low blood pressure | Seu médico verificará isso |
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 lofexidine
Voltar ao conteúdoMantenha 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
Voltar ao conteúdoInformações 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.
Se você for se submeter a uma operação ou tratamento dentário, informe à pessoa que está realizando o tratamento quais medicamentos você está tomando.
Se você comprar qualquer medicamento, verifique com um farmacêutico se é seguro tomá-lo com seus outros medicamentos.
Este medicamento é para você. Nunca o dê a outras pessoas, mesmo que a condição delas pareça ser a mesma que a sua.
Nunca 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 Yellow Card website.

Inseguro sobre misturar medicamentos?
Verifique possíveis interações entre medicamentos, suplementos e alimentos antes de tomá-los juntos.
Perguntas frequentes
How quickly does lofexidine start to work to reduce withdrawal symptoms?
Lofexidine is part of a detoxification programme, and its effects on reducing withdrawal symptoms like chills, sweating, and muscle pain begin as you start taking it. The dose may be increased over the first few days to help manage these symptoms effectively.
What should I do if I forget a dose of lofexidine?
If you forget to take a dose, you should take it as soon as you remember. After that, continue with your regular dosing schedule. It's important not to take two doses together to compensate for a missed dose.
Can I drink alcohol while taking lofexidine?
No, you should not drink alcohol when you are taking lofexidine. Alcohol can worsen side-effects such as feeling sleepy or dizzy.
Will lofexidine help with drug cravings?
Lofexidine is effective in helping to manage the physical withdrawal symptoms associated with opioid detoxification. However, it will not address drug cravings. To successfully break a drug habit, it is recommended to seek support and counselling from local drug community teams, self-help groups, and other agencies.
What is the maximum amount of lofexidine I can take in one day?
The maximum number of tablets you will be prescribed to take at any one time is four, and the maximum total number of tablets you can take within a single day is twelve.
How long is a typical course of lofexidine treatment?
A typical course of lofexidine treatment usually lasts for about 7-10 days. However, in some cases, a course of treatment might be longer than this, depending on individual needs and your doctor's instructions.
Why is it important to have my blood pressure and pulse rate checked while on lofexidine?
Your blood pressure and pulse rate need to be monitored regularly, especially during the first few days of treatment. This is to ensure that the dose you are taking is effectively helping your condition while avoiding any unwanted symptoms related to potential changes in blood pressure or heart rate.
Leitura adicional e referências
- Medicamentos Completo BNF 89ª Edição; Associação Médica Britânica e Sociedade Real de Farmácia da Grã-Bretanha, Londres.
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About the authorView full bio

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.
About the reviewer

Sid Dajani
Sultan Dajani qualified at the London School of Pharmacy in 1994 and became the youngest elected member of the Royal Pharmaceutical Society council since its founding in 1842.
Histórico do artigo
As informações nesta página são escritas e revisadas por clínicos qualificados.
Next review due: 11 Feb 2028
11 Fev 2025 | Última versão

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