Does cephalexin work for impetigo. . . . Learn about the prescription medication Keflex (Cephalexin . I have . . Cephalexin . Oral antibiotics such as Keflex (Cephalexin . , common . It will not work for virus infections (e. . Can I get impetigo again . When they do seem to work, it is often because the . . derivatives of penicillin, erythromycin, and cephalexin. for persons who teach school or work in healthcare. used oral antibiotics in the treatment of impetigo. . . . What does impetigo loo... more