Cephalexin 500mg
Generic For: Keflex
Cephalexin 500mg (brand name Keflex) is a prescription cephalosporin antibiotic used to treat bacterial infections of the skin, urinary tract, respiratory tract, ears, and bones. It is not available over the counter, but you can complete a quick online visit — after a licensed provider reviews your information and issues a prescription, your medication ships from a licensed U.S. pharmacy.
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10-day supply · $0.71/capsule
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Buy Cephalexin 500mg (Keflex) Online
A cephalosporin antibiotic for skin infections, urinary tract infections, and respiratory infections
Cephalexin 500mg Quick Facts
| Drug class | Cephalosporin antibiotic |
|---|---|
| Treats | Skin infections, urinary tract infections, respiratory infections, ear infections |
| Form | Capsule |
| Typical dosing | Take 1 capsule by mouth three times a day for 10 days. |
| Prescription required | Yes — prescription only |
What Is Cephalexin 500mg?
Cephalexin is a first-generation cephalosporin antibiotic sold under the brand name Keflex. It works by interfering with the formation of bacterial cell walls, which stops susceptible bacteria from growing. Doctors commonly prescribe cephalexin 500mg capsules for skin infections, urinary tract infections, and certain respiratory and ear infections. Because it is a prescription medication in the U.S., you cannot buy cephalexin over the counter — a licensed provider must evaluate you first.
What Does Cephalexin 500mg Treat?
Skin and skin structure infections
Urinary tract infections (UTIs)
Respiratory tract infections
Middle ear infections (otitis media)
Bone infections
Acute prostatitis
Cephalexin 500mg Dosage
Adults: 250 mg by mouth every 6 hours, or 500 mg by mouth every 12 hours
Typical range: 1–4 g daily in divided doses, for 7–14 days
Dose and duration depend on the infection; follow your prescriber's directions
Your prescriber will determine the dose and duration that are right for you. Always follow the directions on your prescription label.
Cephalexin 500mg Side Effects
Common side effects
- Diarrhea
- Nausea
- Vomiting
- Indigestion or stomach pain
- Headache
- Dizziness
- Vaginal itching or discharge
Serious side effects
Stop taking this medication and seek medical attention right away if you experience:
- Severe allergic reaction (rash, hives, swelling, trouble breathing)
- Severe or persistent watery/bloody diarrhea (C. difficile infection)
- Severe blistering or peeling skin reactions
- Seizures
- Unusual bleeding or bruising
- Yellowing of the skin or eyes
Warnings & Interactions
Do not use if allergic to cephalexin or other cephalosporin antibiotics
Use caution with a history of penicillin allergy (possible cross-reactivity)
Can cause C. difficile–associated diarrhea, even weeks after treatment ends
Dose adjustment may be needed with kidney impairment
May increase metformin levels; probenecid can raise cephalexin levels
Treats bacterial infections only — not effective against viruses like colds or flu
Finish the full prescribed course even if you feel better
Tell your prescriber about all medications, supplements, and health conditions before starting cephalexin 500mg.
Sources & References
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