Famotidina para reducir el ácido estomacal
Revisado por pares por Sid DajaniÚltima actualización por Michael Stewart, MRPharmSÚltima actualización 16 de mayo de 2024
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Famotidine reduces the amount of acid produced by your stomach.
Any side-effects are usually mild and do not last long.
De un vistazo
Famotidine is a medicine that reduces the amount of acid in your stomach.
It is used to treat conditions like stomach ulcers, duodenal ulcers, and acid reflux.
You can take famotidine tablets before or after meals, once or twice a day.
Always check with a pharmacist if buying other medicines to take alongside famotidine.
Possible side-effects include diarrhoea, constipation, headache, and dizziness.
Acerca de famotidine
Tipo de medicamento | H2-receptor antagonist |
Usado para | Treatment of conditions caused by too much acid being produced in the stomach |
Disponible como | Comprimidos |
Famotidine belongs to a group of medicines that reduce the amount of acid produced by the cells in the lining of the stomach. They are called 'histamine H2-receptor antagonists', but are commonly also called Bloqueadores H2.
Famotidine can be helpful in the treatment of conditions caused by too much acid being produced in the stomach. These conditions include stomach ulcers (gastric ulcers), ulcers of the upper part of the intestine (duodenal ulcers), acid reflux or heartburn (gastro-oesophageal reflux disease). Although famotidine can be helpful in the treatment of these conditions, in practice other medicines are usually tried first.
Acid is produced naturally in your stomach to help to digest food. Excessive amounts of acid can irritate the lining of your stomach, causing inflammation, ulcers and other conditions. Famotidine works by reducing the amount of acid produced by your stomach. This helps to relieve symptoms and assist the healing process where damage has already occurred.
Before taking famotidine
To make sure this is the right treatment for you, before you start taking famotidine it is important that your doctor or pharmacist knows:
Si estás embarazada o amamantando.
If you have any of the following symptoms: difficulty swallowing, loss of blood, weight loss, or if you are being sick.
Si tienes algún problema con el funcionamiento de tus riñones.
Si alguna vez has tenido una reacción alérgica a un medicamento.
Si está tomando otros medicamentos. Esto incluye cualquier medicamento que esté tomando y que esté disponible para comprar sin receta, así como medicamentos herbales y complementarios.
How to take famotidine?
Before you start this treatment, read the manufacturer's printed information leaflet from inside the pack. It will give you more information about famotidine and will provide you with a full list of the side-effects which you may experience from taking it.
Take famotidine exactly as your doctor tells you to. There are two different strengths of tablet available - 20 mg and 40 mg. You may be prescribed famotidine to take twice a day, in the morning and evening, or just once daily in the evening. Your doctor will tell you what dose is right for you and the directions will be on the label of the pack to remind you about what was said to you.
You can take famotidine tablets before or after meals.
If you forget to take a dose at your usual time, you can generally take it when you remember. However, if it is nearly time to take your next dose when you remember, skip the missed dose and take your next dose when it is due. Do not take two doses together to make up for a forgotten dose.
Obteniendo el máximo de tu tratamiento
A course of treatment can vary in length depending upon the reason why you are taking famotidine. You could be asked to take the tablets for a few weeks or for several months. Keep any appointments that you have booked with your doctor so that your progress can be checked.
Some people say that certain foods make their symptoms worse. Foods and drinks that have been suspected of this include peppermint, tomatoes, chocolate, spicy foods, hot drinks, coffee and alcoholic drinks. If it seems that a food is aggravating your symptoms, try avoiding it for a while to see if your symptoms improve. Also, try avoiding eating large meals, as these can make your symptoms worse too.
If you are overweight, this puts extra pressure on your stomach and encourages the symptoms of acid reflux. Losing some weight and eating a healthy balanced diet may help you.
Smoking increases the amount of stomach acid and may make your symptoms worse. If you are a smoker, speak with your doctor or pharmacist about how to quit.
If you buy any medicines 'over the counter', always check with a pharmacist that they are safe to take alongside your other medicines.
Can famotidine 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 famotidine, although these are generally mild and do not last long. 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.
Famotidine side-effects | ¿Qué puedo hacer si experimento esto? |
Diarrhoea or constipation | Bebe mucha agua |
Dolor de cabeza | Bebe mucha agua y pide a tu farmacéutico que te recomiende un analgésico adecuado. Si los dolores de cabeza continúan, informa a tu médico |
Mareo | Si es problemático, hable con su médico |
If you experience any other symptoms which you think may be due to famotidine, speak with your doctor or pharmacist for further advice.
How to store famotidine?
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.
Este medicamento es para ti. Nunca lo des a otras personas, incluso si su condición parece ser la misma que la tuya.
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.
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 famotidine and how does it work?
Famotidine is a type of medicine known as a 'histamine H2-receptor antagonist' or H2 blocker. It works by reducing the amount of acid produced by the cells lining your stomach. This helps to relieve symptoms and allows any existing damage, such as ulcers, to heal.
How long will I need to take famotidine?
The length of your treatment course with famotidine can vary. It depends on the specific reason your doctor has prescribed it. You might need to take the tablets for just a few weeks or potentially for several months. Your doctor will advise you on the expected duration of your treatment.
What should I do if I forget to take a dose of famotidine?
If you miss a dose of famotidine, you can usually take it as soon as you remember. However, if it's almost time for your next scheduled dose, it's best to skip the missed dose and just take your next dose at the correct time. Do not take two doses at once to compensate for a forgotten one.
Are there any lifestyle changes I can make to help my condition while taking famotidine?
Yes, there are several lifestyle adjustments that may help. Avoiding certain foods and drinks that seem to worsen your symptoms, such as peppermint, tomatoes, chocolate, spicy foods, hot drinks, coffee, and alcohol, can be beneficial. Eating smaller meals may also help. If you are overweight, losing weight can reduce pressure on your stomach and improve symptoms. If you smoke, stopping can also reduce stomach acid production.
Can I take famotidine if I am pregnant or breastfeeding?
If you are pregnant, planning to become pregnant, or breastfeeding, it's important to inform your doctor or pharmacist before starting famotidine. They will be able to advise you on whether this treatment is suitable for you.
Lecturas adicionales y referencias
- Manufacturer's PIL, Famotidine 20 mg tablets; Tillomed Laboratories Ltd, The electronic Medicines Compendium. Dated August 2023.
- 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.
Next review due: 17 Apr 2027
16 de mayo de 2024 | Última versión

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