Cefixime: what it does and what to watch
Also known as: Third-generation cephalosporin antibiotic · Third-generation oral cephalosporin antibiotic · Updated 2026-08-19 · Educational — not medical advice
In plain language: This antibiotic interferes with the construction of bacterial cell walls. Bacteria are constantly building and repairing this outer wall as they grow and divide, and by blocking one of the proteins needed for that construction, the medicine causes the wall to become weak and unstable, so the bacterial cell eventually bursts and dies. Because human cells do not have this kind of wall, the drug can target bacteria while leaving the body's own cells largely unaffected.
What it's used for
- Bacterial infections of the urinary tract
- Throat and tonsil infections caused by certain bacteria
- Middle ear infections
- Typhoid fever caused by susceptible bacteria
Common side effects
- Loose stools or diarrhea
- Nausea or stomach discomfort
- Headache
- Mild rash
- Dizziness
- Loss of appetite
Get medical help if…
Severe or persistent watery diarrhea, which can signal a serious gut infection linked to antibiotic use
Signs of an allergic reaction such as facial swelling, difficulty breathing, or widespread hives
Yellowing of the skin or eyes suggesting liver involvement
Unusual bruising or bleeding
Severe skin blistering or peeling
Lab values it can move
Few guides tell you this part: medicines show up in blood work. If you take Cefixime and a value below looks off on your report, this may be part of the story — never stop a medicine without your doctor.
Mild, usually temporary elevations in liver enzymes have been reported and typically resolve once the course is finished.
SGPT (ALT)Since this medicine is cleared through the kidneys, reduced kidney function can affect how it's dosed, and creatinine is sometimes checked beforehand in people with known kidney concerns.
CreatinineA drop in platelet count is uncommon but has been reported occasionally, usually reversing after the medicine is stopped.
Platelet CountGood to know
- Tell a prescriber about any past allergic reaction to penicillins or cephalosporins before starting
- Complete the full course as prescribed even if symptoms improve early, since stopping early can allow bacteria to survive and cause relapse
- Persistent diarrhea during or after treatment should be reported rather than treated with over-the-counter remedies alone
- Dose adjustments may be needed for people with reduced kidney function
- This medicine does not treat viral illnesses such as the common cold or flu
Questions people ask
Will this medicine work for a cold or flu?
No. This is an antibiotic that only works against susceptible bacteria, not viruses. Colds, most sore throats, and influenza are caused by viruses, so taking this medicine for them will not speed recovery and contributes to antibiotic resistance. A prescriber can help determine whether an infection is likely bacterial before treatment is considered.
Why does finishing the full course matter even after feeling better?
Symptoms often ease before all the bacteria are cleared. Stopping early can let the hardier survivors multiply again, sometimes causing a relapse that is harder to treat and encouraging resistant bacteria to develop. Finishing the course as directed gives the medicine the best chance of clearing the infection completely and reduces the risk of recurrence.
Taking Cefixime? See what your blood work says.
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