Cephalexin (cephalexin) — Uses, Dosage, Side Effects & Safety

Drug class: First-generation cephalosporin

Overview

Cephalexin is an antibiotic used to treat a variety of bacterial infections, including those affecting the skin, respiratory tract, urinary tract, bones, and ears. It is effective against many common bacteria but does not work for viral infections like the flu or common cold. Cephalexin works by stopping the growth of bacteria. It does this by interfering with the bacteria's cell wall formation, causing the bacteria to break apart and die. This helps your body clear the infection. Key points: Always take cephalexin exactly as prescribed and finish the full course, even if you feel better. Stopping early can lead to the infection returning or becoming resistant to antibiotics. Let your healthcare provider know about any allergies, especially to penicillins or other cephalosporins.

Therapeutic uses

  • Bacterial infections
  • Skin infections
  • Respiratory tract infections

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Common side effects

  • Diarrhea
  • Nausea
  • Vomiting
  • Abdominal pain
  • Rash
  • Allergic reactions (hives, itching, swelling)
  • Pseudomembranous colitis

Frequently Asked Questions about Cephalexin

What infections does cephalexin treat?

Cephalexin treats bacterial infections such as skin infections, respiratory tract infections, urinary tract infections, bone infections, and ear infections.

Can I take cephalexin if I am allergic to penicillin?

Some people allergic to penicillin may also react to cephalexin. Inform your doctor about any allergies before starting cephalexin.

Should I take cephalexin with food?

Cephalexin can be taken with or without food. Taking it with food may help reduce stomach upset.

What should I do if I develop diarrhea while taking cephalexin?

Mild diarrhea is common, but severe, watery, or bloody diarrhea may indicate a serious infection (C. difficile). Contact your doctor if this occurs.

Is cephalexin safe during pregnancy and breastfeeding?

Cephalexin is generally considered safe during pregnancy and breastfeeding, but always consult your healthcare provider before use.

How long does it take for cephalexin to work?

Most people start to feel better within a few days. However, complete the full course as prescribed to ensure the infection is fully treated.

Can cephalexin treat viral infections like the flu?

No, cephalexin is only effective against bacterial infections and will not treat viral illnesses such as the flu or common cold.

Educational information only. Always consult a qualified healthcare professional before starting, stopping, or changing any medication.