Keflex Antibiotic
Generic name: Cephalexin - Keflex is made by Eli Lilly.
March 21 2017 by Ray Sahelian, M.D. natural health vitamin website

Keflex belongs to a class of antibiotics called cephalosporins. They are similar to penicillin in action and side effects. Cephalosporins stop or slow the growth of bacterial cells by preventing bacteria from forming the cell wall that surrounds each cell. The cell wall protects bacteria from the external environment and keeps the contents of the cell together. Without a cell wall bacteria are not able to survive. Bacteria that are susceptible to Keflex antibiotic include Staphylococcus aureus, Streptococcus pneumoniae, Haemophilus influenzae, E. coli and several others.

Keflex antibiotic is prescribed as Tablets: 250 and 500 mg, and 1 g. Capsules: 250, 333, 500 and 750 mg. Keflex Powder for Suspension: 125, and 250 mg/5 ml.

Conditions where Keflex Antibiotic is Prescribed

Keflex antibiotic is used to treat infections caused by bacteria that are susceptible to the effects of Keflex. Common infections that are treated with Keflex include infections of the middle ear, tonsils, throat, larynx (laryngitis), bronchi (bronchitis) and pneumonia. It also is used for treating urinary tract, skin and bone infections.


J Chemotherapy. 2014. Cephalexin remains the preferred antibiotic for uncomplicated cellulitis: revisited.

Keflex Dosage

The dose of Keflex for adults is 1 to 4 grams in divided doses. Children are treated with 25-100 mg/kg/day in divided doses.

Keflex and Pregnancy, Nursing

Based on limited evidence, cephalosporins, including Keflex, appear to be safe when used during pregnancy. Most cephalosporins are excreted in breast milk. Nursing mothers should avoid using cephalosporins or stop breastfeeding while taking a cephalosporin.

Keflex Side Effects, safety, toxicity

The most common side effects of Keflex are diarrhea, nausea, abdominal pain, headaches, dizziness, skin rash, fever, abnormal liver tests. A Keflex side effect in women could be vaginitis. A rare side effect of Keflex is acquired thrombotic thrombocytopenic purpura.


Is vomiting a Keflex side effect?
   Nausea is a common Keflex side effect. Vomiting can also occur but is not as common as nausea.


Keflex Allergy
Individuals who are allergic to penicillin may also be allergic to Keflex.