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You are here : 3-RX.com > Drugs & Medications > Quick Drug Information (DrugNotes) > Cephalexin (Oral)

Cephalexin (By Mouth)

Cephalexin (sef-a-LEX-in)

Treats bacterial infections. Belongs to a class of drugs called cephalosporin antibiotics.

Brand Name(s):

Keflex, Keftab, Bio-Cef
There may be other brand names for this medicine.

When This Medicine Should Not Be Used:

You should not use this medicine if you have ever had an allergic reaction to cephalosporin medicine such as Ceclor®, Velosef®, or Suprax®.

How to Use This Medicine:

Capsule, Tablet, Liquid

  • Your doctor will tell you how much to take and how often.
  • You may take your medicine with food or milk to avoid stomach upset.
  • Shake the oral liquid well each time you use it.
  • Measure your oral liquid dose carefully with a measuring spoon or a medicine cup.
  • Keep taking your medicine unless your doctor tells you to stop, even if you feel better. If you stop taking this medicine too soon, your infection may come back.

If a dose is missed:

  • Take your medicine as soon as you remember that you have missed your dose.
  • If it is almost time for your next dose, wait until then to take the medicine and skip the missed dose.
  • You should not use two doses at one time.
How to Store and Dispose of This Medicine:

  • Store capsules and tablets at room temperature away from heat, moisture, and direct light.
  • You may keep the oral liquid in the refrigerator for 14 days. After that, throw away any unused liquid. Do not freeze.
  • Keep all medicine out of the reach of children.
Drugs and Foods to Avoid:

Ask your doctor or pharmacist before using any other medicine, including over-the-counter medicines, vitamins, and herbal products.

  • Make sure your doctor knows if you are taking birth control pills or probenecid (Benemid®, ColBENEMID®) while taking cephalexin.
Warnings While Using This Medicine:

  • Before taking this medicine, let your doctor know if you have ever had an allergic reaction to penicillin medicines.
  • If you have severe diarrhea while taking cephalexin, check with your doctor before taking medicine to stop the diarrhea.
  • Cefalexin may cause incorrect results with some urine sugar tests used by patients with diabetes.
  • If you are pregnant or breastfeeding, talk to your doctor before taking this medicine.
Possible Side Effects While Using This Medicine:

Call your doctor right away if you notice any of these side effects:

  • Rash or hives
  • Swelling of the face, throat, or lips
  • Wheezing or trouble breathing
  • Severe diarrhea (watery or bloody)
  • Severe stomach pain or vomiting
  • Blistering or peeling skin

If you notice these less serious side effects, talk with your doctor:

  • Mild diarrhea
  • Nausea
  • Sore mouth or tongue
  • Vaginal itching or discharge
  • Joint aches and pains
If you notice other side effects that you think are caused by this medicine, tell your doctor.


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