Ampicilina para infecciones
Penbritin
Revisado por Sid DajaniÚltima actualización por Michael Stewart, MRPharmSÚltima actualización 11 Mar 2025
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Make sure you tell your doctor if you are allergic to penicillin. Ampicillin is a type of penicillin - do reportado tómalo si eres alérgico a la penicilina.
Space your doses out evenly over the day and complete the full course of the antibiotic, even if you feel your infection has cleared up. You should take ampicillin when your stomach is empty of food (so an hour before you eat, or two hours afterwards).
Si tiene una reacción alérgica (como hinchazón alrededor de la boca, dificultades para respirar o una erupción roja), contacte a un médico de inmediato.
About ampicillin
Tipo de medicamento | Un antibiótico de penicilina |
Usado para | Infecciones (en adultos y niños) |
Disponible como | Capsules, oral liquid medicine and injection |
Ampicillin is given to treat a bacterial infection. It is mainly prescribed for sinus y infecciones respiratorias, urine infections, and infecciones de oído. It is a penicillin antibiotic which treats infection by killing the germs (bacteria) responsible for the infection.
Before taking ampicillin
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 ampicillin it is important that your doctor knows:
If you suspect you may have glandular fever (the symptoms are high temperature (fever), sore throat, swollen glands).
If you have an allergic condition, or if you have ever had an allergic reaction to a medicine. This is especially important if you have ever had a bad reaction to any penicillin antibiotic.
Si tienes algún problema con el funcionamiento de tus riñones.
If you are pregnant or breastfeeding. Ampicillin is not known to be harmful to babies; however, it is still important that you tell your doctor if you are expecting or breastfeeding a baby.
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 ampicillin
Before you start the treatment, read the manufacturer's printed information leaflet from inside the pack. It will give you more information about ampicillin and will provide you with a full list of the side-effects which you may experience from taking it.
Take ampicillin exactly as your doctor tells you to. It is usually taken four times a day, every six hours. Your doctor or pharmacist will tell you how you should take the medication, and this information will be printed on the label of the pack to remind you. It is important that you space out the doses evenly during the day. Swallow the capsules with a drink of water.
You should take ampicillin when your stomach is empty, which means taking your doses one hour before you eat any food, or waiting until two hours afterwards. This is because your body absorbs less ampicillin after a meal, which means the medicine is less effective.
Si le han dado medicina líquida para un niño, lea las instrucciones cuidadosamente para asegurarse de medir la cantidad correcta de medicina.
If you forget to take a dose, take one as soon as you remember. Try to take the correct number of doses each day, but do not take two doses at the same time to make up for a forgotten dose.
Obteniendo el máximo de tu tratamiento
Even if you feel your infection has cleared up, keep taking the antibiotic until the course is finished (unless a doctor tells you to stop). This is to prevent the infection from coming back.
Antibiotics are prescribed in short courses of treatment. Your doctor will tell you how long your course of treatment will last - this is not usually for longer than 14 days. If you still feel unwell after finishing the course, go back to see your doctor.
Some people develop redness and itching in the mouth or vagina (thrush) after taking a course of antibiotics. If this happens to you, speak with your doctor or pharmacist for advice.
If you are taking the contraceptive 'pill' at the same time as this antibiotic, the effectiveness of the 'pill' can be reduced if you have a bout of being sick (vomiting) or diarrhoea which lasts for more than 24 hours. If this should happen, ask your doctor or pharmacist for advice about what additional contraceptive precautions to use over the next few days. There is no need to use additional precautions for any bouts of sickness or diarrhoea which last for less than 24 hours.
Ampicillin can stop the oral typhoid vaccine from working. If you are due to have any vaccinations, make sure the person treating you knows that you are taking this antibiotic.
Can ampicillin 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 ampicillin. 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 ampicillin side-effects (these affect fewer than 1 in 10 people) | ¿Qué puedo hacer si experimento esto? |
Sentirse mal (náuseas) o estar enfermo (vómitos) | Mantente con alimentos simples |
Diarrea | Bebe mucha agua para reemplazar los líquidos perdidos. Si la diarrea continúa, se vuelve severa o contiene sangre, informa a tu médico de inmediato |
Redness and itching in the mouth or vagina (thrush) | Speak with a pharmacist or your doctor for advice about treatment |
Erupción cutánea | Let your doctor know as soon as possible as your treatment will need to be changed |
Importante: if you develop an itchy rash, swollen face or mouth, or have difficulty breathing, these may be signs that you are allergic to a penicillin antibiotic.
Do not take any more of this medicine and speak with your doctor or go to your local accident and emergency department straightaway.
If you experience any other symptoms which you think may be due to the antibiotic, speak with your doctor or pharmacist for further advice.
How to store ampicillin
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.
Si te han dado medicina líquida, guárdala en el refrigerador. Habrá sido preparada por la farmacia y dura siete días, así que revisa la fecha de caducidad en el frasco y no la uses después de esta fecha.
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 de inmediato 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, consulta con un farmacéutico que sea seguro tomarlo 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, 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.
Preguntas frecuentes
What should I do if I get thrush while taking ampicillin?
Some people develop redness and itching in the mouth or vagina (thrush) after taking antibiotics. If this happens to you, speak with your doctor or pharmacist for advice.
Does ampicillin affect birth control pills?
If you are taking the contraceptive 'pill' at the same time as this antibiotic, its effectiveness can be reduced if you experience vomiting or diarrhoea that lasts for more than 24 hours. In such cases, ask your doctor or pharmacist for advice on additional contraceptive precautions to use. However, for sickness or diarrhoea lasting less than 24 hours, no additional precautions are needed.
Can ampicillin interact with vaccines?
Ampicillin can prevent the oral typhoid vaccine from working correctly. If you are scheduled for any vaccinations, it's important to inform the person treating you that you are taking this antibiotic.
What are the signs of a severe allergic reaction to ampicillin?
Important signs of a penicillin allergy include an itchy rash, swelling in the face or mouth, or difficulty breathing. If you experience any of these symptoms, you must stop taking the medicine immediately and speak with your doctor or go to your local accident and emergency department.
How should I dispose of old or unused ampicillin?
No debes conservar medicamentos caducados o no deseados. Llévalos a tu farmacia local, que se encargará de desecharlos de manera segura por ti.
Lecturas adicionales y referencias
- Medicamentos Completo BNF 89ª Edición; Asociación Médica Británica y Sociedad Real de Farmacia de Gran Bretaña, Londres.
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.
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