Learn about common and serious Cefixime side effects, who's most at risk, how to manage them, and when you need to call your doctor right away.
Cefixime (brand name Suprax) is a widely used third-generation cephalosporin antibiotic prescribed for urinary tract infections, ear infections, strep throat, bronchitis, and gonorrhea. Like any antibiotic, it comes with potential side effects—most of them mild and manageable, but some that require immediate medical attention.
This guide breaks down exactly what to expect when taking Cefixime, which side effects are common versus serious, and when you should call your doctor.
Cefixime is an oral antibiotic that kills bacteria by disrupting their cell wall synthesis. It's available as 400 mg capsules, chewable tablets (100 mg, 150 mg, 200 mg), and oral suspension for children. A typical adult dose is 400 mg once daily, and treatment usually lasts 5–14 days depending on the infection.
For a more detailed overview, see our full guide: What Is Cefixime? Uses, Dosage, and What You Need to Know.
These side effects are relatively frequent and usually don't require medical intervention unless they become severe or persistent:
Most of these side effects improve as your body adjusts to the medication and resolve completely once you finish your course.
These side effects are rare but can be dangerous. Contact your doctor or seek emergency care immediately if you experience any of the following:
Cefixime is approved for children 6 months and older. The most common side effect in kids is diarrhea. The oral suspension and chewable tablets make dosing easier, but note that chewable tablets contain phenylalanine—a concern for children with phenylketonuria (PKU).
Cefixime is Pregnancy Category B, meaning animal studies have not shown risk to the fetus. However, human data is limited. Your doctor will weigh the benefits against potential risks.
It's unknown whether Cefixime passes into breast milk. Talk to your doctor if you're breastfeeding.
Cefixime is excreted by the kidneys. If your creatinine clearance is 20 mL/min or less, your doctor should reduce the dose. Patients on dialysis need dose adjustments as well.
There is a small risk of cross-reactivity between penicillin and cephalosporin antibiotics. If you have a history of severe penicillin allergy (anaphylaxis), Cefixime may not be safe for you. Always tell your doctor about penicillin allergies.
Here are practical tips to reduce discomfort while taking Cefixime:
Important: Do NOT take anti-diarrheal medications like loperamide (Imodium) without asking your doctor first. If your diarrhea is caused by C. diff, anti-diarrheal drugs can make it worse.
Most people tolerate Cefixime well. Diarrhea and stomach discomfort are the most common complaints, and they typically resolve once you finish your antibiotic course. Serious side effects are rare but real—know the warning signs so you can act fast if they occur.
If you experience severe diarrhea, an allergic reaction, or any of the serious symptoms listed above, don't wait—contact your doctor or go to the emergency room immediately.
For more about Cefixime—including how it works, what it interacts with, and how to save money on your prescription—explore our other guides:
You focus on staying healthy. We'll handle the rest.
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