Loperamida para la diarrea
Imodium, Norimode
Peer reviewed by Sid DajaniLast updated by Michael Stewart, MRPharmSLast updated 13 Oct 2023
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For adults with acute diarrhoea: take two tablets/capsules as soon as possible; then take one tablet/capsule after each time you go to the toilet with diarrhoea.
Have lots of water to drink to prevent you from becoming dehydrated. Eat as normally as possible, as soon as you feel able.
If your symptoms continue for more than 48 hours, speak with your doctor or pharmacist for advice if you have not already done so.
Loperamide must not be taken by children under 12 years of age unless it is prescribed for them by a doctor.
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What is loperamide?
Tipo de medicamento | An antimotility medicine |
Utilizado para | Acute diarrhoea |
También llamado | Imodium®; Loritax®; Norimode® |
Disponible como | Capsules, tablets and 'instant' (dissolve-in-the-mouth) tablets |
Loperamide is a medicine that can help if you have acute diarrhoea. Acute diarrhoea in adults starts suddenly and in most cases eases within a few days. The main treatment is to have lots to drink to prevent dehydration. The most common cause of acute diarrhoea is an infection. Many bacteria, viruses, and other germs can cause diarrhoea. In most cases the diarrhoea settles as your body's immune system clears the infection. Antidiarrhoeal medicines like loperamide may not be necessary; however, they can be helpful if you wish to reduce the number of trips that you need to make to the toilet. Most people only need to take loperamide for a day or so.
Loperamide works by slowing down the activity of your bowel. This reduces the speed at which the contents pass through, and so food remains in your intestines for longer. This allows more water to be absorbed back into your body and results in firmer stools that are passed less often.
Because loperamide regulates the passage of food through the digestive system, it can also help people with diarrhoea associated with irritable bowel syndrome, and people who need help to regulate their bowel movement following surgery on the intestines.
You can buy loperamide from retail outlets or get it on prescription from your doctor; however, it is not suitable for children under the age of 12 years unless it has been prescribed by a doctor.
Before taking loperamide
To make sure this is the right treatment for you, before you start taking loperamide it is important that you speak with your doctor or pharmacist:
Si está embarazada o en periodo de lactancia.
If you have liver problems.
If you have a long-term bowel condition such as ulcerative colitis.
Si está tomando otros medicamentos. Esto incluye cualquier medicamento que esté tomando y que pueda adquirirse sin receta, así como medicamentos a base de plantas y complementarios.
Si alguna vez ha tenido una reacción alérgica a un medicamento.
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How to take loperamide
Before you start the treatment, read the manufacturer's printed information leaflet from inside the pack. It will give you more information about loperamide and will provide you with a full list of the side-effects which you may experience from taking it.
Take loperamide exactly as your doctor tells you to, or as directed on the label. The usual dose for acute diarrhoea in an adult is 4 mg (two tablets/capsules) taken straightaway, followed by 2 mg (one tablet/capsule) after each time you go to the toilet with diarrhoea. This usually means taking three or four tablets/capsules a day. Never take more than eight tablets/capsules a day. If your symptoms continue for more than 48 hours, you should speak with a doctor if you have not already done so. Stop taking loperamide as soon as your symptoms settle down.
Most loperamide capsules and tablets are best swallowed with a drink of water. However, if you have been given a brand called Imodium® Instants, these are specially designed to dissolve in your mouth - place the tablet on your tongue and allow it to dissolve there before you swallow.
Loperamide should only be taken by a child younger than 12 years of age on the advice of a doctor. If your child has been prescribed loperamide liquid medicine, check the label on the bottle carefully to make sure you know what dose to give.
If you forget to take a dose, do not worry, just take a dose after the next time you go to the toilet with diarrhoea. Do not take two doses together to make up for a missed dose.
Aproveche al máximo su tratamiento
It is important that you have lots to drink to prevent you from becoming dehydrated. Drinking plain water is ideal, but juice and/or soup are also suitable. Try to avoid drinks that contain a lot of sugar, such as cola or pop, as they can sometimes make diarrhoea worse.
Oral rehydration salts can be taken to help prevent dehydration and replace lost salts. These are especially recommended for children and for people who are frail or who have underlying health problems. You can buy these from a pharmacy.
Eat small, light meals as soon as you are able. Plain foods such as bread and rice are good foods to try eating first.
If your symptoms continue for more than 48 hours, speak with a doctor or pharmacist for advice if you have not already done so. If loperamide has been prescribed by your doctor and your diarrhoea has not settled after five days, you should return to your doctor for further advice.
If your symptoms get worse, or if you develop a high temperature, or if you pass blood in the diarrhoea, you should consult a doctor for advice as soon as possible.
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Can loperamide 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 most common ones associated with loperamide. 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.
Common loperamide side-effects (these affect fewer than 1 in 10 people) | ¿Qué puedo hacer si me ocurre esto? |
Estreñimiento | Stop taking loperamide |
Wind (flatulence), feeling dizzy | This should soon pass. If it becomes troublesome, stop taking loperamide |
Dolor de cabeza | Drink plenty of water and ask your pharmacist to recommend a suitable painkiller. |
Sensación de malestar (náuseas) | Try taking loperamide after eating some food if you are not already doing so |
If you experience any other symptoms which you think may be due to loperamide, speak with your doctor or pharmacist for further advice.
How to store loperamide
Mantenga todos los medicamentos fuera de la vista y del alcance 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
No tome nunca más de la dosis prescrita. Si sospecha que usted u otra persona ha tomado una sobredosis de este medicamento, acuda al servicio de urgencias de su hospital. Llévese el envase, aunque esté vacío.
Si va a someterse a una operación o a un tratamiento dental, comunique a la persona que lleve a cabo el tratamiento qué medicamentos está tomando.
Si compra algún medicamento, compruebe con un farmacéutico que es adecuado para tomarlo con sus otros medicamentos.
Este medicamento es para usted. Nunca se lo dé a otras personas aunque su enfermedad parezca ser la misma que la suya.
No guarde medicamentos caducados o que no desee. Llévelos a su farmacia local, que se encargará de eliminarlos por usted.
Si tiene cualquier duda sobre este medicamento pregunte a su farmacéutico.
Informar de los efectos secundarios de un medicamento o vacuna
Si experimenta efectos secundarios, puede notificarlos en línea a través del sitio web de la Tarjeta Amarilla.
Lecturas complementarias y referencias
- Manufacturer's PIL, Imodium® Classic 2 mg Capsules; McNeil Products Ltd, The electronic Medicines Compendium. Dated October 2022.
- Manufacturer's PIL, Imodium® Instant Melts; McNeil Products Ltd, The electronic Medicines Compendium. Dated October 2022.
- Medicamentos BNF completa 89ª edición; Asociación Médica Británica y Real Sociedad Farmacéutica de Gran Bretaña, Londres.
Historia del artículo
La información de esta página ha sido redactada y revisada por médicos cualificados.
Next review due: 12 Oct 2026
13 Oct 2023 | Latest version

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