Phexin uses — what this antibiotic treats and how to use it safely

Phexin (a brand of cefixime) is an oral cephalosporin antibiotic you may see for common bacterial infections. Doctors prescribe it for things like ear infections, sinus infections, bronchitis, some throat infections, uncomplicated urinary tract infections and certain cases of gonorrhea. It kills bacteria by stopping them from building cell walls, so it only works on bacterial — not viral — infections.

How Phexin is usually used

Adults often take 400 mg once daily or 200 mg twice daily. For specific infections such as gonorrhea, a single higher dose may be used. Children get a weight-based dose; the exact amount depends on age and weight. Always follow the prescription label or your doctor’s instructions — don’t double up if you miss a dose unless your prescriber tells you to.

Finish the whole course even if you feel better after a day or two. Stopping early can let surviving bacteria come back stronger and may encourage resistance. Don’t use Phexin for colds or the flu — those are viral and won’t respond.

Safety, side effects and precautions

Common side effects are mild: diarrhea, nausea, stomach pain and sometimes a rash. If you get severe diarrhea with blood or mucus, call your doctor — that can be a sign of Clostridioides difficile infection. Allergic reactions range from mild rash to rare but serious anaphylaxis; seek emergency care if you have trouble breathing, swelling of the face or throat, or widespread hives.

If you take blood thinners like warfarin, cefixime can affect how your blood clots. Your doctor may check your INR more often. People with reduced kidney function may need lower doses because the drug clears slower. Tell your prescriber about kidney problems, liver issues, or a history of severe allergic reactions to antibiotics (especially penicillins or other cephalosporins).

Pregnancy and breastfeeding: tell your doctor if you are pregnant or nursing. Cefixime is commonly used when needed, but your clinician will weigh benefits and risks and choose the safest option.

Drug interactions are relatively few, but always list your current meds to your provider and pharmacist. Over-the-counter medicines and supplements can matter too, so mention everything you take.

Practical tips: take Phexin with or without food based on how it affects your stomach; keep hydrated; store tablets in a cool, dry place; do not share antibiotics with others. If symptoms don’t improve in 48–72 hours or they get worse, contact your healthcare provider — you may need a different antibiotic or further tests.

Phexin is useful when chosen for the right bug. If you’re unsure why it was prescribed, ask your clinician: what infection they suspect, how long to take it, and what side effects to watch for. That short conversation can prevent problems and help the medicine work as intended.