Keflex is commonly prescribed to treat and prevent bacterial infections. A few of the infections that the drug can treat are respiratory tract infections, sinus infections, and skin infections. It can also prevent heart valve infections. Keflex comes in both capsule and liquid form, and is usually taken two to four times a day. Common side effects include diarrhea, headache, and nausea.

What Is Keflex?

Keflex® (cephalexin) is a prescription antibiotic that is licensed to treat a number of common bacterial infections. It is part of a class of antibiotics called cephalosporins.

What Is It Used For?

Uses for Keflex include the following:
  • Treatment for a bacterial infection, such as a:
  • Prevention of heart valve infections (bacterial endocarditis).
(Click Keflex Uses for more information.)
This medication is not effective against any infection caused by a virus, such as the flu, stomach flu, or common cold.

How Does Keflex Work?

Keflex prevents bacteria from making and maintaining their cell wall. Without a cell wall, bacteria are vulnerable and ultimately die. As a result, the infection is kept from spreading within the body.
Examples of other medicines in this class include Omnicef® (cefdinir) and Rocephin® (ceftriaxone).
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Keflex Antibiotic

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