Cefalexin pour l'infection
Keflex
Peer reviewed by Dr Colin Tidy, MRCGPLast updated by Michael Stewart, MRPharmSLast updated 26 Nov 2024
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Before you take cefalexin, make sure your doctor knows if you have ever had an allergic reaction to an antibiotic.
Space out your doses evenly over the day and complete the full course.
The most common side effect of cefalexin is diarrhoea, which is usually mild and soon passes.
If diarrhoea becomes severe or lasts for more than 24 hours, you should speak with your doctor.
Dans cet article :
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About cefalexin
Type de médicament | Antibiotique de type céphalosporine |
Utilisé pour | Treatment (and sometimes prevention) of infection |
Également appelé | Cephalexin, Keflex® (USA) |
Disponible en | Capsules, tablets, and oral liquid medicine |
What is cefalexin used for?
Cefalexin is a type of antibiotic used to treat bacterial infections such as urinary tract infections, skin infections, chest and throat infections, ear infections and dental infections.
It is suitable for adults and children and can be taken during pregnancy.
Some people who are allergic to penicillin antibiotics may not be able to take cefalexin, so make sure your doctor knows if you have ever had an allergic reaction to any other antibiotic.
Cefalexin treats an infection by killing the bacteria that are causing it.
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Side effects of cefalexin
Common side effects of cefalexin are:
Diarrhée.
Sensation de malaise (nausée).
Indigestion.
Maux d'estomac.
Grive.
You will find a full list in the manufacturer's information leaflet supplied with the medicine.
Les effets indésirables s'atténuent souvent au fur et à mesure que votre corps s'adapte au nouveau médicament, mais parlez-en à votre médecin ou à votre pharmacien si l'un des effets suivants persiste ou devient gênant.
How to manage cefalexin side effects
Cefalexin side effects | Que puis-je faire si je suis confronté à cette situation ? |
Diarrhée | Drink plenty of water to replace the lost fluids. If the diarrhoea continues for longer than 24 hours, becomes severe, or contains blood, please let your doctor know straightaway |
Indigestion, stomach ache, feeling sick | Privilégiez les aliments simples. Si ce n'est pas déjà le cas, essayez de prendre vos doses après les repas |
Thrush | Demandez conseil à votre médecin ou à votre pharmacien |
Important: if you develop an itchy rash, swollen face or mouth, or have difficulty breathing, these can be signs that you are allergic to the antibiotic. Do not take any more doses, 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, please speak with your doctor or pharmacist for further advice.
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Who should not take cefalexin?
Some medicines are not suitable for people with certain conditions. Before starting cefalexin it is important that your doctor knows:
Si vous avez déjà eu une réaction allergique à un médicament. Il est particulièrement important que vous informiez votre médecin si vous avez eu une mauvaise réaction à une pénicilline ou à une céphalosporine.
Si vous avez des problèmes de fonctionnement des reins.
If you are pregnant, trying for a baby or breastfeeding. Although cefalexin is not known to be harmful to babies, it is still important that you tell your doctor if you are expecting or breastfeeding a baby.
Si vous prenez ou utilisez d'autres médicaments. Cela comprend tous les médicaments que vous prenez et qui sont disponibles sans ordonnance, ainsi que les médicaments à base de plantes et les médicaments complémentaires.
How to take cefalexin
Read the leaflet inside the pack before starting cefalexin. It explains how the antibiotic works and lists possible side effects.
Take cefalexin 2-4 times a day, as directed by your doctor. Check the label for your exact dose and timing.
For children: if using liquid cefalexin, carefully measure each dose as instructed.
Treatment usually lasts 5-7 days, but your doctor may adjust this. Always follow their advice.
For UTI prevention: you may take one dose daily, usually in the evening.
You can take cefalexin before or after food, but it may work a bit faster before meals.
Space doses evenly through the day and complete the full course, even if you feel better.
If you miss a dose, take it as soon as you remember. Do not take twice to make up for a missed one.
Tirer le meilleur parti de votre traitement
Tell your doctor or healthcare provider if you’re taking cefalexin before any operation or medical test, as it can affect some test results.
Antibiotics can sometimes cause thrush (oral or vaginal). If this happens, speak to your doctor or pharmacist.
If you take the contraceptive pill and have vomiting or diarrhoea for more than 24 hours while on antibiotics, the pill may be less effective. Ask your doctor or pharmacist about extra contraception. No extra precautions are needed if symptoms last less than 24 hours.
Cefalexin can stop the oral typhoid vaccine from working properly. Tell the person giving you any vaccines that you’re taking this antibiotic.
How to store cefalexin
Conservez tous les médicaments hors de la portée et de la vue des enfants.
Conserver les comprimés et les gélules dans un endroit frais et sec, à l'abri de la chaleur et de la lumière directes.
If you have been given liquid medicine, store it in a refrigerator. It will have been made up freshly by the pharmacy and lasts for 14 days, so please remember to check the expiry date, and do not use it after this date.
Informations importantes sur tous les médicaments
Informations importantes sur tous les médicaments
Ne dépassez pas la dose prescrite. Si vous pensez que vous ou quelqu'un d'autre avez pris une dose excessive de ce médicament, rendez-vous au service des accidents et des urgences de votre hôpital local. Emportez la boîte avec vous, même si elle est vide.
Ce médicament est pour vous. Ne le donnez jamais à d'autres personnes, même si leur état semble être le même que le vôtre.
Si vous achetez des médicaments, vérifiez auprès d'un pharmacien qu'ils peuvent être pris en même temps que vos autres médicaments.
Si vous devez subir une opération ou un traitement dentaire, indiquez à la personne chargée du traitement les médicaments que vous prenez.
Ne gardez pas les médicaments périmés ou dont vous ne voulez plus. Apportez-les à votre pharmacie locale qui les éliminera pour vous.
Si vous avez des questions sur ce médicament, demandez à votre pharmacien.
Signaler les effets secondaires d'un médicament ou d'un vaccin
Si vous ressentez des effets secondaires, vous pouvez les signaler en ligne sur le site web de la carte jaune.
Questions fréquemment posées
How quickly does cefalexin work?
Cefalexin usually starts to work within an hour after taking the first dose. Most people notice improvement in symptoms, such as reduced pain, fever, or redness, within the first 1-2 days of treatment.
Is cefalexin safe to use during pregnancy?
Yes, cefalexin is considered safe to use during pregnancy as there is no evidence that it causes harm to the baby. However, always let your doctor or midwife know you are pregnant before taking cefalexin.
Does cefalexin contain penicillin?
No, cefalexin does not contain penicillin. However it is a cephalosporin antibiotic, which is chemically related to penicillin. People who are allergic to penicillin may also be allergic to cefalexin, so it is important to inform your doctor if you have a penicillin allergy before taking cefalexin.
Can you drink alcohol with cefalexin?
Yes, you can drink alcohol with cefalexin. However, it is advised to only drink in moderation as alcohol may increase side effects such as stomach upset, dizziness, or drowsiness.
Can cefalexin cause a rash?
Yes, cefalexin can cause a rash as a side effect and is usually a sign of an allergic reaction. If you develop a mild rash, contact your doctor for advice. If you have trouble breathing or swelling of the face, lips, tongue, or throat, seek medical help immediately.
Autres lectures et références
- Manufacturer's PIL, Cefalexin 250 mg and 500 mg Capsules; Aurobindo Pharma - Milpharm Ltd; The electronic Medicines Compendium. Dated August 2024.
- Manufacturer's PIL, Cefalexin 125 mg and 250 mg/5 ml Powder for Oral Suspension; Aurobindo Pharma - Milpharm Ltd; The electronic Medicines Compendium. Dated March 2024.
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Historique de l'article
Les informations contenues dans cette page sont rédigées et évaluées par des cliniciens qualifiés.
Prochaine révision prévue : 26 Nov 2027
26 Nov 2024 | Dernière version

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