Ampicillin gegen Infektionen
Penbritin
Begutachtet von Sid DajaniZuletzt aktualisiert von Michael Stewart, MRPharmSLast updated 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 nicht take it if you are allergic to penicillin.
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).
If you have an allergic reaction (such as any swelling around your mouth, any difficulties breathing or a red rash) contact a doctor straightaway.
At a glance
Ampicillin is a penicillin antibiotic used to treat bacterial infections like those in the sinus, chest, urine, and ears.
Take ampicillin on an empty stomach, either an hour before food or two hours after a meal.
It is usually taken four times a day; ensure doses are spaced evenly and you complete the full course.
If you suspect glandular fever, have kidney problems, or have had allergic reactions, tell your doctor.
Seek medical advice if you experience a severe or bloody rash, or severe or persistent diarrhoea.
Stop taking ampicillin and get urgent medical help if you develop an itchy rash, swollen face, or breathing difficulties.
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About ampicillin
Art des Medikaments | A penicillin antibiotic |
Verwendet für | Infections (in adults and children) |
Verfügbar als | Capsules, oral liquid medicine and injection |
Ampicillin is given to treat a bacterial infection. It is mainly prescribed for sinus und Brustinfektionen, urine infections, and Ohreninfektionen. It is a penicillin antibiotic which treats infection by killing the germs (bacteria) responsible for the infection.
Before taking ampicillin
Zurück zum InhaltSome 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.
Wenn Sie Probleme mit der Funktionsweise Ihrer Nieren haben.
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.
Wenn Sie andere Medikamente einnehmen. Dazu gehören alle Medikamente, die Sie einnehmen und die ohne Rezept erhältlich sind, sowie pflanzliche und ergänzende Medikamente.
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How to take ampicillin
Zurück zum InhaltBefore 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.
If you have been given liquid medicine for a child, read the directions carefully to make sure you measure out the correct amount of medicine.
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.
Das Beste aus Ihrer Behandlung herausholen
Zurück zum InhaltEven 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.
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Can ampicillin cause problems?
Zurück zum InhaltAlong 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) | Was kann ich tun, wenn ich das erlebe? |
Sich krank fühlen (Übelkeit) oder krank sein (Erbrechen) | Bleiben Sie bei einfachen Lebensmitteln |
Durchfall | Drink plenty of water to replace any lost fluids. If the diarrhoea continues, becomes severe, or contains blood, let your doctor know sofort |
Redness and itching in the mouth or vagina (thrush) | Speak with a pharmacist or your doctor for advice about treatment |
Hautausschlag | Let your doctor know as soon as possible as your treatment will need to be changed |
Wichtig: 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
Zurück zum InhaltBewahren Sie alle Medikamente außerhalb der Reichweite und Sicht von Kindern auf.
An einem kühlen, trockenen Ort aufbewahren, fern von direkter Hitze und Licht.
If you have been given liquid medicine, store it in a refrigerator. It will have been made up by the pharmacy and lasts for seven days, so check the expiry date on the bottle and do not use it after this date.
Wichtige Informationen über alle Medikamente
Zurück zum InhaltWichtige Informationen über alle Medikamente
Nehmen Sie niemals mehr als die vorgeschriebene Dosis ein. Wenn Sie vermuten, dass Sie oder jemand anderes eine Überdosis dieses Medikaments eingenommen hat, gehen Sie sofort in die Notaufnahme Ihres örtlichen Krankenhauses. Nehmen Sie den Behälter mit, auch wenn er leer ist.
Dieses Medikament ist für Sie. Geben Sie es niemals an andere Personen weiter, auch wenn deren Zustand ähnlich erscheint wie Ihrer.
Wenn Sie Medikamente kaufen, fragen Sie einen Apotheker, ob sie sicher mit Ihren anderen Medikamenten eingenommen werden können.
Wenn Sie sich einer Operation oder einer zahnärztlichen Behandlung unterziehen, informieren Sie die Person, die die Behandlung durchführt, über die Medikamente, die Sie einnehmen.
Bewahren Sie keine abgelaufenen oder unerwünschten Medikamente auf. Bringen Sie sie zu Ihrer örtlichen Apotheke, die sie für Sie entsorgt.
Wenn Sie Fragen zu diesem Medikament haben, fragen Sie Ihren Apotheker.
Berichten Sie Nebenwirkungen eines Medikaments oder Impfstoffs
Wenn Sie Nebenwirkungen bemerken, können Sie diese online über die Yellow Card website.

Unsicher beim Mischen von Medikamenten?
Überprüfen Sie mögliche Wechselwirkungen zwischen Medikamenten, Nahrungsergänzungsmitteln und Lebensmitteln, bevor Sie sie zusammen einnehmen.
Häufig gestellte Fragen
What's the difference between ampicillin and other antibiotics?
Ampicillin is a type of penicillin antibiotic. It works by killing the bacteria responsible for an infection, and it is commonly used for infections like sinus, chest, urine, and ear infections.
I'm worried about missing a dose of ampicillin. What should I do if I forget?
If you forget to take a dose, you should take it as soon as you remember. It's important to try and take the correct total number of doses each day, but never take two doses at the same time to compensate for a forgotten one.
How long will I usually need to take ampicillin for?
The duration of your treatment with ampicillin will be advised by your doctor, but it is typically not for longer than 14 days. You should always complete the full course of antibiotics, even if you start feeling better, to prevent the infection from returning.
Can I eat normally while taking ampicillin?
You should take ampicillin on an empty stomach. This means taking your dose one hour before eating food or waiting two hours after a meal. This is because food can reduce how much ampicillin your body absorbs, making the medicine less effective.
What if I develop a skin rash while taking ampicillin?
If you develop a skin rash, you should inform your doctor as soon as possible. Your treatment may need to be changed.
I'm concerned my symptoms haven't improved after finishing the course of ampicillin. What should I do?
If you still feel unwell after completing your course of ampicillin, you should go back to see your doctor for further evaluation.
Is it safe to get vaccinated while taking ampicillin?
Ampicillin can stop the oral typhoid vaccine from working effectively. If you are scheduled for any vaccinations, it's important to tell the person administering the vaccine that you are currently taking ampicillin.
How should I store liquid ampicillin if I've been given some?
If you have liquid ampicillin, you should store it in a refrigerator. It will have an expiry date on the bottle, usually lasting seven days from when it was made up by the pharmacy, so make sure not to use it after this date.
Weiterführende Literatur und Referenzen
- Medikamente Komplett BNF 89. Ausgabe; Britische Ärztevereinigung und Königliche Pharmazeutische Gesellschaft von Großbritannien, London.
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About the authorView full bio

Michael Stewart, MRPharmS
Manager für die Überprüfung von Beipackzetteln – Auftragnehmer, Apotheker
BPharm (Hons), MRPharmS
Michael ist ein Gemeindapotheker, der in den Midlands und South Yorkshire praktiziert und über mehr als 20 Jahre Erfahrung in der Beratung zu Medikamenten und medizinischen Bedingungen verfügt. Er hat einen starken Hintergrund in der Gesundheitsausbildung, da er Schulungskurse für Apothekenteams und Mitarbeiter von Pflegeeinrichtungen, einschließlich Krankenschwestern, erstellt und durchgeführt hat. Er hat auch zu Apothekenbeiräten für das Management von geringfügigen Erkrankungen in der Gemeinschaft beigetragen.
About the reviewer

Sid Dajani
Sultan Dajani qualified at the London School of Pharmacy in 1994 and became the youngest elected member of the Royal Pharmaceutical Society council since its founding in 1842.
Artikelverlauf
Die Informationen auf dieser Seite wurden von qualifizierten Klinikern verfasst und begutachtet.
Next review due: 10 Mar 2028
11 Mar 2025 | Neueste Version

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