Cefaclor antibiotics — what you need to know

Here’s a quick fact: cefaclor is a second‑generation cephalosporin that doctors often pick for ear infections, some respiratory bugs, and certain skin infections. If you were prescribed cefaclor or you’re comparing antibiotics, this page gives clear, useful facts so you can talk smarter with your provider.

How cefaclor is used and dosed

Cefaclor comes as tablets or a liquid. Adults usually take it two or three times a day, depending on the infection and dose. Kids get a weight‑based dose — that’s why the liquid form matters for pediatrics. Typical courses run 5–10 days, but follow the exact length your clinician prescribes. Stopping early can let the infection come back or breed resistance.

It works by blocking bacteria from building a cell wall, so it kills or slows bacteria growth. It’s not effective for viruses like colds or the flu, so make sure the diagnosis is bacterial before using it.

Side effects, warnings, and interactions

Common side effects are stomach upset, diarrhea, and sometimes a mild rash. More serious reactions like severe allergic reactions are rare but possible, especially if you have a penicillin allergy — tell your doctor about any past reactions. If you get hives, swelling, or trouble breathing after taking cefaclor, seek emergency care.

Cefaclor can alter gut bacteria and increase the risk of C. difficile diarrhea in some people. It can also interact with certain drugs; for example, combining it with probenecid can raise cefaclor levels. If you’re on blood thinners, always check with your clinician because antibiotics sometimes affect clotting control.

If you miss a dose, take it as soon as you remember unless it’s almost time for the next one. Don’t double up to catch up.

Resistance matters. If symptoms don’t improve in 48–72 hours, contact your clinician. They may switch antibiotics or order tests to identify the specific bacteria.

For people with kidney problems, dose adjustments are often needed. Pregnant or breastfeeding? Tell your provider — many cephalosporins are considered safer in pregnancy than some other antibiotic classes, but the clinician will weigh risks and benefits.

Shopping tip: buy the full prescribed course and store liquid forms per label instructions. Shake suspensions well and toss unused liquid after the recommended period.

Alternatives include other penicillins and cephalosporins, or macrolides if you’re allergic to beta‑lactams. Which alternative is right depends on the infection, local resistance patterns, and your medical history.

Want more context? Browse related guides and reviews on our site for side‑by‑side comparisons, pricing tips, and safe online pharmacy advice. If you’re unsure whether cefaclor fits your case, a short call with your clinician can save time and avoid wrong treatments.

Use antibiotics responsibly: take the full course, avoid sharing meds, and ask your healthcare provider when you can stop or switch therapy.