Parents & Patients



Cefalexin (also known as cephalexin) is a commonly used antibiotic that has a broad range of activity against common bacterial infections.

It is a first generation cephalosporin and is often used in urinary tract infections as well infections of the chest, ears and throat, sinuses, skin and soft tissue.

One of the principle side effects is allergy. It is important to note that up to 6.5% of patients who are penicillin allergic will also be allergic to cephalosporins like cefalexin.

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  • Side Effects
  • References
  • Author

Cefalexin is usually well tolerated but side effects include diarrhoea,nausea & vomiting, allergic reactions, abdominal pain and rashes. Other side effects do occurr and can be found in the summary of product characteristics.

The British National Formulary & the summary of product characteristics.

Dr Tim Ubhi

Review date: May 2017