Antibiotics Home > Keflex (Cephalexin) Drug Information

There is a lot of information about the prescription drug Keflex® (cephalexin) that you should be aware of before starting treatment. As with any antibiotic, it is important to finish your entire prescription (even if you start feeling better) to ensure that the infection is completely treated.
In addition, never take outdated Keflex; taking any outdated medication may cause serious problems because the intended effects often change after the medicine expires.
Keflex is not effective against any infection caused by a virus, such as the flu, stomach flu, or common cold. It is approved to prevent bacterial endocarditis (heart valve infections) and to treat bacterial infections, such as middle ear infections, sinus infections, or respiratory tract infections.
This medication 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.
A number of side effects have been reported with Keflex (cephalexin). Drug information gathered in clinical studies shows that the most common side effects include:
(Click Keflex for more information on this drug, including dosing guidelines, more details on specific uses, and general warnings and precautions.)
Written by/reviewed by:
Last reviewed by: Kristi Monson, PharmD;
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