What is keflex?

Keflex®is a semi-synthetic cephalosporin chemical compoundclassified as a medicine, which usescephalexinas an active ingredient that belongs to the type of medicines with antibiotic effect, created to combat a large number of infections caused by various bacteria and pathogenic microorganisms.

To highlight: This drug is made by the pharmaceutical company named Eli Lilly and Company of Mexico, SA DE CV (1)

What is keflex for?

  • Thanks to its mechanism of action, keflex® is a bactericidal drug that actsby inhibiting the synthesis of the bacterial cell walleliminating susceptible microorganisms, thus eradicating infectionscaused in the body.
  • It is used to treat:

Dosage and routes of administration of keflex

Keflex®comes as a box with 12 tablets or capsulescontaining 500 mg cephalexin base and suspensionof 250 mg/5 ml. The administration of keflex® is oral and its dosage as a guideline, can be as follows:

  • Keflex® Tablets: Adult population, 250 mg every 6 hours or 500 mg every 12 hours.
  • Keflex® suspension: In children the recommended dose is 25 to 50 mg/kg in divided doses.

Note: It is advisable to consult the doctor to establish the appropriate dose for each type of patient.

side effects of keflex

Therapeutic treatment with keflex® may cause some of the following adverse effects in a certain patient population:

  • Allergic reactions due to contact with any component of the formula in sensitive patients.
  • Pseudomembranous colitis.
  • Nausea, diarrhea , and Vomiting .
  • Dyspepsia, gastritis and abdominal pain .
  • Stevens Johnson
  • Transient hepatitis and cholestatic jaundice .
  • Fever, aplastic anemia and hemorrhage.
  • Renal dysfunction and toxic nephropathy.

Important: If any of these symptoms or another not included in the list appear during treatment with keflex®, please stop taking it and consult your doctor .

Contraindications and warnings of keflex

The use of keflex® is contraindicated in the following cases:

  • Hypersensitivity to any of the formula’s components.
  • During the first trimester of pregnancy.
  • During breastfeeding .

You should know: Provide all the information about your medical history to your doctor, before starting treatment with this medicine.

Avoid if you have:

  • History of hypersensitivity to cephalosporins.
  • History of hypersensitivity to penicillins .


  • Pharmaceutical products such as keflex® must be administered with a prescription or prescription.
  • Do not administer this medicine with the intake of drugs or alcoholic substances.
  • If you are being medicated for any other pathology with any medication or drug, you should consult your doctor before taking keflex®.
  • Follow your doctor’s instructions while taking this drug.
  • Keep this product out of the reach of children.

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