Lofexidine tablets
BritLofex, Lucemyra
Revisado por pares por Sid DajaniÚltima actualización por Michael Stewart, MRPharmSÚltima actualización 11 Feb 2025
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Clinical author's note 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.
De un vistazo
Lofexidine is used to reduce withdrawal symptoms during opioid detoxification.
It helps to reduce effects like chills, sweating, stomach cramps, and muscle pain.
Take lofexidine exactly as your doctor tells you, usually for around 7-10 days.
Do not stop taking it suddenly, as your doctor will reduce your dose gradually.
Common side effects include feeling dizzy or sleepy, dry mouth, slow heart rate, and low blood pressure.
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) |
También llamado | Lucemyra® (USA), BritLofex® (UK - discontinued) |
Disponible 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
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 lofexidine it is important that your doctor knows:
Si estás embarazada o amamantando.
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.
If you have low blood pressure.
If you have had a stroke or 'mini-stroke' (also known as a transient ischaemic attack, or TIA).
If you are feeling depressed.
Si tienes algún problema con el funcionamiento de tus riñones.
Si está tomando o usando otros medicamentos. Esto incluye cualquier medicamento que esté tomando y que esté disponible para comprar sin receta, así como medicamentos herbales y complementarios.
Si alguna vez has tenido una reacción alérgica a un medicamento.
How to take lofexidine
Lofexidine 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.
Obteniendo el máximo de tu tratamiento
It 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.
Can lofexidine cause problems?
Along 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) | ¿Qué puedo hacer si experimento esto? |
Sentirse mareado o somnoliento | 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 | Intenta masticar chicle sin azúcar o chupar caramelos sin azúcar |
Slow heart rate, low blood pressure | Su médico verificará esto |
Si experimenta otros síntomas que cree que pueden deberse al medicamento, hable con su médico o farmacéutico para obtener más consejos.
How to store lofexidine
Mantenga todos los medicamentos fuera del alcance y la vista de los niños.
Almacenar en un lugar fresco y seco, lejos del calor y la luz directos.
Información importante sobre todos los medicamentos
Información importante sobre todos los medicamentos
Nunca tome más de la dosis prescrita. Si sospecha que usted u otra persona podría haber tomado una sobredosis de este medicamento, acuda al departamento de accidentes y emergencias de su hospital local. Lleve el envase con usted, incluso si está vacío.
Si vas a someterte a una operación o tratamiento dental, informa a la persona que realiza el tratamiento sobre los medicamentos que estás tomando.
Si compras algún medicamento, consulta con un farmacéutico que sea seguro tomarlo junto con tus otros medicamentos.
Este medicamento es para ti. Nunca lo des a otras personas, incluso si su condición parece ser la misma que la tuya.
Nunca guardes medicamentos caducados o no deseados. Llévalos a tu farmacia local, donde se encargarán de desecharlos por ti.
Si tienes alguna pregunta sobre este medicamento, consulta a tu farmacéutico.
Informar efectos secundarios de un medicamento o vacuna
Si experimenta efectos secundarios, puede reportarlos en línea a través de Sitio web de Yellow Card.

¿Inseguro sobre mezclar medicamentos?
Verifica posibles interacciones entre medicamentos, suplementos y alimentos antes de tomarlos juntos.
Preguntas frecuentes
Can I drive or operate machinery while taking lofexidine?
Lofexidine can cause dizziness and sleepiness. If you experience these side-effects, you should not drive or use tools or machines. It's best to sit down until you feel better.
What should I do if I forget to take a dose of lofexidine?
If you miss a dose, take it as soon as you remember. After that, continue with your regular schedule. Do not take a double dose to compensate for the one you missed.
How long will I typically need to take lofexidine?
You will usually take lofexidine for about 7 to 10 days, although sometimes a course of treatment might last longer. Your doctor will advise you on the exact duration for your individual detoxification programme.
What kind of support can help me during my detoxification in addition to lofexidine?
While lofexidine helps with withdrawal symptoms, it doesn't address cravings. You are more likely to succeed by seeking support and counselling. Local drug community teams, self-help groups, and other agencies can provide assistance. It's recommended to accept counselling and help if available in your area.
What if I experience a dry mouth or throat while taking lofexidine?
If you experience a dry mouth or throat, you can try chewing sugar-free gum or sucking on sugar-free sweets to help alleviate this symptom.
Are there any specific dietary recommendations while taking lofexidine?
It is advised to maintain a light diet. Also, ensure you drink plenty of fluids to stay hydrated during your treatment.
Lecturas adicionales y referencias
- Medicamentos Completos BNF 89ª Edición; Asociación Médica Británica y Sociedad Real de Farmacia de Gran Bretaña, Londres.
Sobre el autorVer biografía completa

Michael Stewart, MRPharmS
Gerente de Revisión de Folletos de Medicamentos – Contratista, Farmacéutico
BPharm (Hons), MRPharmS
Michael es un farmacéutico comunitario que ejerce en Midlands y South Yorkshire con más de 20 años de experiencia asesorando sobre medicamentos y condiciones médicas. Tiene una sólida formación en capacitación en atención médica, habiendo producido e impartido cursos de formación para equipos de farmacia y personal de entornos de atención residencial, incluidas enfermeras. También ha contribuido a juntas asesoras de farmacia para la gestión de condiciones de baja gravedad en la comunidad.
Acerca del revisor

Sid Dajani
Sultan Dajani se graduó en la Escuela de Farmacia de Londres en 1994 y se convirtió en el miembro más joven elegido para el consejo de la Sociedad Real de Farmacia desde su fundación en 1842.
Historial del artículo
La información en esta página está escrita y revisada por pares por clínicos calificados.
Artículo también disponible en Inglés, Alemán, Español, Francés, Italiano, Portugués, Hindi, Hebreo, Árabe, y Sueco.
Próxima revisión: 11 Feb 2028
11 Feb 2025 | Última versión

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