Cefalexin for infection
Keflex
Revisione paritaria di Dr Colin Tidy, MRCGPUltimo aggiornamento di Michael Stewart, MRPharmSUltimo aggiornamento 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.
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Video consigliati per Medicinali per il trattamento delle infezioni
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About cefalexin
Tipo di medicinale | Un antibiotico cefalosporinico |
Utilizzato per | Treatment (and sometimes prevention) of infection |
Chiamato anche | Cephalexin, Keflex® (USA) |
Disponibile come | Capsules, tablets, and oral liquid medicine |
What is cefalexin used for?
Torna ai contenutiCefalexin is a type of antibiotic used to treat bacterial infections such as urinary tract infections, skin infections, petto e throat infections, infezioni dell'orecchio e 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
Torna ai contenutiCommon side effects of cefalexin are:
Diarrea.
Nausea.
Indigestione.
Mal di stomaco.
Candidosi.
You will find a full list in the manufacturer's information leaflet supplied with the medicine.
Gli effetti indesiderati spesso migliorano man mano che il tuo corpo si adatta al nuovo medicinale, ma parla con il tuo medico o farmacista se uno dei seguenti persiste o diventa problematico.
How to manage cefalexin side effects
Torna ai contenutiCefalexin side effects | Cosa posso fare se sperimento questo? |
Diarrea | 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 immediatamente |
Indigestion, stomach ache, feeling sick | Attieniti a cibi semplici. Se non lo stai già facendo, prova a prendere le tue dosi dopo i pasti |
Candidosi | Speak with your doctor or pharmacist for advice |
Importante: 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?
Torna ai contenutiSome medicines are not suitable for people with certain conditions. Before starting cefalexin it is important that your doctor knows:
Se hai mai avuto una reazione allergica a un medicinale. È particolarmente importante che informi il tuo medico se hai avuto una brutta reazione a un antibiotico penicillinico o cefalosporinico.
Se hai problemi con il funzionamento dei tuoi reni.
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.
Se stai assumendo o utilizzando altri medicinali. Questo include qualsiasi medicinale che stai assumendo e che è disponibile per l'acquisto senza prescrizione, così come i medicinali a base di erbe e complementari.
How to take cefalexin
Torna ai contenutiRead 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.
Ottenere il massimo dal tuo trattamento
Torna ai contenutiTell your doctor or healthcare provider if you’re taking cefalexin before any operation or medical test, as it can affect some test results.
Gli antibiotici a volte possono causare il mughetto (orale o vaginale). Se ciò accade, parla con il tuo medico o farmacista.
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 vaccino orale contro il tifo from working properly. Tell the person giving you any vaccines that you’re taking this antibiotic.
How to store cefalexin
Torna ai contenutiTenere tutti i medicinali fuori dalla portata e dalla vista dei bambini.
Store tablets and capsules in a cool, dry place, away from direct heat and light.
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.
Informazioni importanti su tutti i medicinali
Torna ai contenutiInformazioni importanti su tutti i medicinali
Do not take more than the prescribed dose. If you suspect that you or someone else might have taken an overdose of this medicine, go to the accident and emergency department of your local hospital. Take the container with you, even if it is empty.
Questo medicinale è per te. Non darlo mai ad altre persone, anche se la loro condizione sembra essere la stessa della tua.
Se acquisti dei medicinali, verifica con un farmacista che siano sicuri da assumere insieme agli altri tuoi medicinali.
Se devi sottoporti a un'operazione o a un trattamento dentale, informa la persona che esegue il trattamento sui medicinali che stai assumendo.
Non conservare medicinali scaduti o indesiderati. Portali alla tua farmacia locale che li smaltirà per te.
Se hai domande su questo medicinale, chiedi al tuo farmacista.
Segnala effetti collaterali di un medicinale o vaccino
Se si verificano effetti collaterali, è possibile segnalarli online tramite il sito web Yellow Card.
Domande frequenti
Torna ai contenutiHow 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.

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Ulteriori letture e riferimenti
- 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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Storia dell'articolo
Le informazioni su questa pagina sono scritte e revisionate da clinici qualificati.
Next review due: 26 Nov 2027
26 Nov 2024 | Ultima versione

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