Cephalexin is a common oral antibiotic doctors prescribe for skin infections, ear infections, urinary tract infections, and some throat infections. It’s a first‑generation cephalosporin — that means it kills certain bacteria by stopping their cell walls from forming. Simple as that, but how you use it matters.
Follow your prescriber’s directions. Typical adult doses are 250–500 mg every 6–12 hours depending on the infection, and treatment usually lasts 5–14 days. For kids, doctors dose by weight — don’t guess. Take pills with or without food. Finish the full course even if you feel better early; stopping too soon can let bacteria come back stronger.
If you have reduced kidney function your doctor may lower the dose or stretch the time between doses. Tell your doctor about other drugs you take — for example, probenecid can raise cephalexin levels. Also mention any penicillin allergy; cross‑reactivity is uncommon but possible, so your doctor will want to check.
Most people handle cephalexin fine. Common side effects are stomach upset, diarrhea, and mild rash. If you get severe diarrhea, bloody stools, high fever, or persistent belly pain, call your doctor — those can be signs of C. difficile, a serious gut infection tied to antibiotics.
Watch for allergic reactions: hives, swelling of face or throat, trouble breathing. If any of those appear, seek emergency care. Also let your doctor know if you develop a new yeast infection or unusually yellow skin/eyes or dark urine; both need prompt attention.
Two quick safety points: don’t use cephalexin for viral illnesses like colds or the flu, and avoid sharing antibiotics. Using them when not needed fuels resistance and makes future infections harder to treat.
If you’re on blood thinners like warfarin, your provider may monitor your INR more closely. Cephalexin doesn’t usually affect birth control, but if you’re concerned, use a backup method while taking antibiotics and for a short time after.
Thinking of buying cephalexin online? You should have a valid prescription. Choose a licensed pharmacy with clear contact info and real reviews. Avoid sites that sell prescription drugs without asking for a prescription or offer suspiciously low prices. Check packaging and expiry dates when the medicine arrives.
Got questions while taking it? Call your prescribing clinician or a pharmacist. They can confirm dose, check interactions with other meds, and tell you what to watch for. Use antibiotics wisely — they work well when used correctly.
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