Alimemazine
Alfresed, Itzenal
Revisado por pares por Dr Colin Tidy, MRCGPÚltima actualización por Michael Stewart, MRPharmSÚltima actualización 30 Ago 2022
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Alimemazine is used to keep young children calm before an operation, and to ease allergic skin reactions.
The most common side effect is feeling sleepy or dizzy.
If you feel drowsy or sleepy, do not drive and do not use tools or machines.
De un vistazo
Alimemazine is an antihistamine used for allergic skin conditions and as a sedative for young children before operations.
It works by blocking histamine, which causes allergic reactions.
Common side effects include feeling sleepy or dizzy, blurred vision, and dry mouth.
Avoid driving or using machines if you feel drowsy or dizzy.
Do not drink alcohol while taking alimemazine as it increases drowsiness.
Always follow your doctor's instructions for dosage and do not exceed it.
Resumen
Tipo de medicamento | A phenothiazine antihistamine |
Usado para | Some allergic skin conditions, and as a sedative for young children before an operation |
También llamado | Trimeprazine (in US); Alfresed®, Itzenal® |
Disponible como | Tabletas y medicina líquida oral |
What is alimemazine used for?
Alimemazine is a type of antihistamine used to relieve lumpy and itchy allergic skin reactions called hives (urticaria). It is also used before surgical procedures to help keep young children calm.
When alimemazine is prescribed for a young child who is about to have an operation, it produces a sedative effect which helps the child feel relaxed. Alimemazine is not suitable for children under 2 years of age.
How does alimemazine work?
Alimemazine works by blocking a substance called histamine in the body. In some people, an excess of histamine is produced by exposure to substances such as pollen, pet fur, house dust or insect bites, and this causes reacciones alérgicas en la piel.
By blocking histamine, alimemazine eases the itchiness and lumpiness of these reactions.
Side effects of alimemazine
Common side effects of alimemazine include:
Feeling sleepy or dizzy.
Visión borrosa.
Boca seca.
Dolor de cabeza.
Malestar estomacal.
Feeling shaky or restless.
Encontrará una lista completa en el prospecto informativo del fabricante que se suministra con su medicamento.
Los efectos no deseados a menudo mejoran a medida que su cuerpo se adapta al nuevo medicamento, pero hable con su médico o farmacéutico si alguno de los siguientes persiste o se vuelve problemático.
How to manage alimemazine side effects
Common alimemazine side effects | ¿Qué puedo hacer si experimento esto? |
Feeling sleepy or dizzy, blurred vision | If this happens, do not drive and do not use tools or machines. You may feel light-headed, particularly when you first start taking this medicine. Getting up more slowly until you are aware how you react should help |
Boca seca | Intenta masticar chicle sin azúcar o chupar caramelos sin azúcar |
Dolor de cabeza | Ask your doctor or pharmacist to recommend a suitable painkiller |
Stomach upset | Stick to simple meals |
Sensación de temblores o inquietud, movimientos musculares inusuales o incontrolables | Speak with your doctor as soon as possible |
Sleeping problems, mood changes, stuffy nose, changes in sexual ability, breast changes or tenderness, menstrual problems, fast heartbeat, constipation, difficulty passing urine, rash | Consulte a su médico si alguno de estos le causa molestias |
Si experimenta otros síntomas que cree que pueden deberse a este medicamento, hable con su médico o farmacéutico.
Who should not take alimemazine?
Before you start taking alimemazine it is important that your doctor or pharmacist knows:
Si estás embarazada, intentando tener un bebé o amamantando.
Si tienes una afección cardíaca o enfermedad de los vasos sanguíneos.
Si tienes problemas de hígado, riñón o próstata.
If you have any difficulties peeing or if you have been constipated for some time.
Si tienes problemas para respirar.
If you have any of the following: epilepsy, Parkinson's disease, depression, increased pressure in your eyes (glaucoma), or a condition called myasthenia gravis which causes muscle weakness.
Si alguna vez ha tenido amarillamiento de la piel o del blanco de los ojos (ictericia) o un trastorno sanguíneo.
If you have low levels of thyroid hormone (hypothyroidism).
If you have a tumour on your adrenal gland (phaeochromocytoma).
Si tienes un trastorno sanguíneo hereditario raro llamado porfiria.
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 ha tenido una reacción alérgica a otro antihistamínico, o a cualquier otro medicamento.
How to take alimemazine
Read the leaflet before use. It contains important information about alimemazine and possible side effects.
Take alimemazine exactly as prescribed:
Adults and children aged 12 years and over: 10 mg, 2-3 times a day. A lower dose may be recommended if you are over 65.
Children aged 5-11 years: 5 mg, 3-4 times a day.
Children aged 2-4 years: 2.5 mg, 3-4 times a day.
Measure liquid medicine carefully. If giving alimemazine liquid to a child, use the measuring device provided and follow the dosing instructions on the bottle.
Take with or without food. Swallow tablets with a drink of water if preferred.
If you miss a dose, skip it. Take your next dose at the usual time. Do not take two doses together to make up for a missed dose.
Obteniendo el máximo de tu tratamiento
Alimemazine causes drowsiness. If you feel drowsy or sleepy, do not drive and do not use tools or machines.
Do not drink alcohol while you are on alimemazine as it increases the chance you will feel sleepy.
Alimemazine may cause your skin to become more sensitive than normal to sunlight. Use a sunscreen that protects against UVA light and has a sun protection factor (SPF) of at least 15, especially in strong sunlight or until you know how your skin reacts. Do not use sunbeds.
If you buy any medicines, check with a pharmacist that they are suitable to take with alimemazine. This is because a number of other medicines can interfere with the way alimemazine works or can increase the risk of side effects.
If you are having an operation or any dental treatment, tell the person carrying out the treatment that you are taking alimemazine.
How to store alimemazine
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.
Preguntas frecuentes
How quickly does alimemazine work?
Alimemazine usually starts to work within 15-30 minutes, although it may take longer for some people to feel the full effect. If you are taking it for itching or an allergic skin reaction, you should notice an improvement in your symptoms shortly after taking a dose.
How long does alimemazine stay in your system?
The effects of alimemazine can last for several hours. Some people may continue to feel drowsy the following day, especially after higher doses.
Can I take alimemazine every day?
Take alimemazine exactly as prescribed by your doctor. It may be used daily for some allergic conditions, but the length of treatment will depend on your symptoms and medical history.
Can I take alimemazine with other antihistamines?
Do not take alimemazine with other antihistamines unless your doctor or pharmacist advises you to. Combining antihistamines may increase the risk of side effects such as drowsiness and dizziness.
Can I drink alcohol while taking alimemazine?
It is best to avoid alcohol while taking alimemazine. Alcohol can increase drowsiness and make side effects such as dizziness more likely.
Can I buy alimemazine over the counter?
No. In the UK, alimemazine is generally available on prescription and is not usually sold over the counter.
Información importante sobre todos los medicamentos
Información importante sobre todos los medicamentos
Si compras algún medicamento, consulta con un farmacéutico que sea seguro tomarlo junto con tus otros 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 a un tratamiento dental, informa a la persona que realiza el tratamiento sobre los medicamentos que estás tomando.
Este medicamento es para ti. Nunca lo des a otras personas, incluso si su condición parece ser la misma que la tuya.
No guardes medicamentos caducados o no deseados. Llévalos a tu farmacia local, que se encargará 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
What is the difference between alimemazine and other antihistamines?
Alimemazine is a phenothiazine antihistamine. It is primarily used for allergic skin conditions like hives and as a sedative for young children before operations. While it works by blocking histamine like other antihistamines, its specific chemical structure (phenothiazine) can lead to different uses and side effect profiles compared to other types of antihistamines.
Are there any food restrictions I need to be aware of when taking alimemazine?
Alimemazine can be taken with or without food. There are no specific food restrictions mentioned with this medication.
What should I do if I accidentally take more alimemazine than prescribed?
If you suspect that you or someone else might have taken an overdose of this medicine, you should go to the accident and emergency department of your local hospital immediately. Remember to take the container with you, even if it is empty.
Can alimemazine affect my ability to drive or operate machinery?
Yes, alimemazine commonly causes drowsiness, sleepiness, and blurred vision. If you experience these effects, it is crucial not to drive or operate tools or machines to ensure your safety and the safety of others.
How should I dispose of any leftover or expired alimemazine?
You should not keep out-of-date or unwanted medicines at home. Take them to your local pharmacy, which will dispose of them safely and correctly for you.
Can I give my alimemazine to someone else if they have similar symptoms?
No, this medicine is specifically prescribed for you. You should never give it to other people, even if their condition appears to be the same as yours. Medicines should only be used by the person they were prescribed for.
Lecturas adicionales y referencias
- Manufacturer's PIL, Alimemazine Tartrate 10 mg Film-coated Tablets; Zentiva, The electronic Medicines Compendium. Dated January 2021.
- Manufacturer's PIL, Alimemazine Tartrate 7.5 mg/5 ml Syrup; Zentiva, The electronic Medicines Compendium. Dated September 2021.
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 revisorVer biografía completa

Dr Colin Tidy, MRCGP
Médico General, Autor Médico
MBBS, MRCGP, MRCP (Paediatrics), DCH
El Dr. Colin Tidy es un médico del NHS, con sede en Oxfordshire.
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: 27 feb 2027
30 Ago 2022 | Última versión

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