Cefaclor — what it treats and how to use it safely
Cefaclor is an oral antibiotic in the cephalosporin family. Doctors commonly prescribe it for ear infections (otitis media), sinus and throat infections, bronchitis, some skin infections like cellulitis, and certain urinary tract infections. It kills bacteria by stopping their cell wall growth, so it only works for bacterial infections — not colds or flu.
How to take cefaclor
Typical adult dosing is 250–500 mg every 8 hours. There’s an extended‑release form taken twice daily, depending on the product. Children get a weight-based dose, usually around 20–40 mg per kg per day divided into doses. There’s a chewable tablet and a liquid suspension for kids who can’t swallow pills.
Take cefaclor with food to lower the chance of stomach upset and to help your body absorb it better. If a dose is missed, take it as soon as you remember unless it’s almost time for the next dose — don’t double up. Finish the full course even if you feel better; stopping early can let the infection come back or promote resistance.
Side effects, warnings, and interactions
Common side effects are nausea, mild diarrhea, and occasional rash. More serious reactions include severe diarrhea (which could signal C. difficile infection), swelling, hives, or breathing difficulties — these need immediate medical care. If you’re allergic to penicillin, mention that to your doctor; cross-reaction can happen, so your clinician will choose therapy carefully.
People with reduced kidney function often need a lower dose because cefaclor is cleared through the kidneys. Some medicines, like probenecid, raise cefaclor levels by slowing excretion. Blood thinners sometimes need monitoring while taking antibiotics. Always share a full medicine list with your prescriber, including supplements.
For pregnant or breastfeeding people, cefaclor may be used when the benefit outweighs any risk. Discuss options with your clinician; they’ll advise based on your situation.
Keep an eye on storage instructions: some suspensions require refrigeration, others only room temperature — check the label. Store all forms away from moisture and heat.
Buying and safety tips: cefaclor is prescription-only in most countries. Buy from licensed pharmacies only. For online sellers, look for a verifiable address, pharmacist contact info, and a requirement to upload or fax a prescription. Avoid sites that sell antibiotics without asking for a prescription — those can be unsafe or ship counterfeit products.
When to call your doctor: if you develop high fever, severe or bloody diarrhea, swelling of face or throat, trouble breathing, or a rapidly spreading skin rash, seek immediate care. For milder side effects, call your prescriber to discuss switching antibiotics or supportive measures.
If you have questions about cefaclor and your health, check with a pharmacist or your healthcare provider — they can give advice tailored to your medical history and the infection you’re treating.
