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Keflex (cephalexin) is FDA-approved to treat bacterial infections of the skin and soft tissue, urinary tract, respiratory tract (including strep throat and pneumonia), bone, and middle ear. It is effective against many gram-positive organisms such as Staphylococcus aureus and Streptococcus pyogenes, as well as some gram-negative bacteria.

Keflex is a first-generation cephalosporin antibiotic. It works by binding to penicillin-binding proteins on the bacterial cell wall, blocking the final steps of cell wall synthesis. Without an intact cell wall, bacteria cannot survive, which stops the infection.

The typical course of Keflex is 7 to 14 days depending on the type and severity of infection. Your physician will specify the duration. It is important to complete the full prescribed course even if symptoms improve early, to prevent antibiotic resistance and recurrence.

Keflex belongs to the cephalosporin class of antibiotics, which is related to but distinct from penicillins. A small percentage of people with a penicillin allergy may also react to cephalosporins. You should inform your Doctronic physician of any known drug allergies so they can assess your individual risk and choose the safest antibiotic for you.

The most commonly reported side effects of Keflex include diarrhea, nausea, stomach upset, and vomiting. Less common effects include skin rash and headache. Serious but rare reactions include severe allergic reactions (anaphylaxis) and Clostridioides difficile-associated diarrhea. Contact a provider if you develop severe or persistent symptoms.

Keflex has relatively few significant drug interactions. Probenecid can increase cephalexin blood levels by reducing renal clearance. Keflex may also affect the accuracy of certain urine glucose tests. Always share your full medication list with your physician so interactions can be reviewed before prescribing.

Doctronic uses AI-powered evaluation to gather your symptom history and health information. A licensed physician then reviews your case, makes a clinical determination, and if appropriate, provides a treatment plan including a prescription sent to your preferred pharmacy.

Yes. Doctronic connects patients with fully licensed physicians practicing in the United States. All consultations are doctor-reviewed and audited for quality, and the platform is HIPAA-compliant to protect your personal health information.