Ranitidina para reducir el ácido estomacal
Zantac
Revisado por pares por Sid DajaniÚltima actualización por Michael Stewart, MRPharmSÚltima actualización 17 May 2024
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Clinical author's note Michael Stewart 18/5/2024: Further to earlier notes, all ranitidine products have now been discontinued in the UK. At the time of review there are no branded or generic products containing ranitidine available in the UK. Ranitidine 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.
Clinical author's note Michael Stewart 22/02/23: As a precautionary measure all ranitidine-containing products have been discontinued globally whilst the scientific investigation into its risks and benefits is ongoing. It is not known whether ranitidine products will be made available again in the future. If you have any concerns regarding your use of ranitidine please speak to your doctor or a pharmacist.
Clinical author's note Michael Stewart 21/11/2019: Since October 2019 a large number of ranitidine products have been recalled by their manufacturers. Pharmacies and other retailers have been told to remove these products from sale. The recalls are due to a risk of contamination with a potentially harmful chemical. There may be an ongoing shortage of ranitidine products as a consequence. If you have any concerns about the medicine you are taking you should speak with your pharmacist for advice.
Ranitidine reduces the amount of acid produced by your stomach.
Any side-effects are usually mild and do not last long.
De un vistazo
Ranitidine is a medicine that reduces stomach acid, used for conditions like ulcers and acid reflux.
It comes as tablets or a liquid, and some lower strengths can be bought without a prescription.
Take ranitidine as directed, either before or after meals.
Possible side-effects include tummy pain, feeling sick, dizziness, and headache.
Speak to a doctor or pharmacist before taking ranitidine if you have certain symptoms or other medical conditions.
About ranitidine
Tipo de medicamento | H2-receptor antagonist |
Usado para | Treatment of conditions caused by too much acid being produced in the stomach |
También llamado | Zantac® (discontinued) |
Disponible como | Tabletas y medicina líquida oral |
Ranitidine 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.
Ranitidine is 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 (reflux oesophagitis), and indigestión. Ranitidine is also prescribed to treat ulceration of the stomach which has been caused by medicamentos antiinflamatorios no esteroides (AINEs).
Acid is produced naturally in your stomach to help you digest food. Excessive amounts of acid can irritate the lining of your stomach, causing inflammation, ulcers and other conditions. Ranitidine 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.
Ranitidine is available on prescription. You can also buy short courses of ranitidine at retail outlets for symptoms such as heartburn, indigestion and hyperacidity in adults and in children over 16 years of age.
Before taking ranitidine
To make sure that this is the right treatment for you, before you start taking ranitidine it is important that you speak with a doctor or pharmacist:
Si estás embarazada o amamantando.
If you have any of the following symptoms: difficulty swallowing, loss of blood, or weight loss, or if you are being sick.
Si tienes algún problema con el funcionamiento de tus riñones.
Si tienes un trastorno sanguíneo hereditario raro llamado porfiria.
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 ranitidine
Before you start this treatment, read the manufacturer's printed information leaflet from inside the pack. It will give you more information about ranitidine and will provide you with a full list of the side-effects which you may experience from taking it.
Take ranitidine exactly as your doctor tells you to, or as directed on the label if you have bought it. There are three different strengths of tablet available - 75 mg, 150 mg and 300 mg. Only the lower strength of tablet can be purchased. Ranitidine is taken once or twice a day.
You can take ranitidine either before or after meals.
If you forget to take a dose at your usual time, you can take it when you remember. However, if it is nearly time to take your next dose when you remember, leave out 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 ranitidine. It may be just for a few days to relieve your symptoms, or for several weeks to help an ulcer heal. 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.
Fumar aumenta la cantidad de ácido producido por el estómago y puede empeorar sus síntomas. Si usted es fumador, hable con su médico o farmacéutico sobre cómo dejar de fumar.
Can ranitidine 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 ranitidine, 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.
Ranitidine side-effects | ¿Qué puedo hacer si experimento esto? |
Constipation or diarrhoea, tummy pain | Esto debería pasar pronto |
Sentirse mal (náuseas) | Mantente con comidas simples - evita alimentos ricos o picantes |
Feeling dizzy, headache | Esto debería pasar pronto |
If you experience any other symptoms which you think may be due to ranitidine, speak with your doctor or pharmacist for further advice.
How to store ranitidine
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 compras algún medicamento, siempre consulta con un farmacéutico que sea seguro tomarlos junto con tus otros medicamentos.
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
Can ranitidine be used by children?
Ranitidine can be bought over-the-counter for use in adults and in children over 16 years of age for symptoms like heartburn, indigestion, and hyperacidity.
What happens if I take too much ranitidine?
If you suspect that you or someone else might have taken an overdose of ranitidine, you should go to the accident and emergency department of your local hospital immediately. Remember to bring the medicine container with you, even if it is empty.
How long does a course of ranitidine treatment typically last?
The duration of treatment with ranitidine can vary. It might be for just a few days to relieve symptoms, or it could extend for several weeks, for example, to allow an ulcer to heal fully. It's important to keep any scheduled appointments with your doctor to monitor your progress.
What lifestyle changes can help improve symptoms while taking ranitidine?
Certain foods like peppermint, tomatoes, chocolate, spicy foods, hot drinks, coffee, and alcohol may worsen symptoms, so avoiding them might help. Eating smaller meals can also be beneficial. If you are overweight, losing weight can reduce pressure on your stomach and improve acid reflux symptoms. Quitting smoking is also recommended, as it increases stomach acid production.
When was Zantac discontinued?
The article states that Zantac® (which is ranitidine) has been discontinued as a brand.
Lecturas adicionales y referencias
- Manufacturer's PIL, Gavilast® Heartburn and Indigestion 75 mg Film-coated Tablets; Reckitt Benckiser Healthcare (UK) Ltd, The electronic Medicines Compendium. Dated October 2016.
- 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: 26 Apr 2027
17 May 2024 | Última versión

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