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Published on: 9/28/2026
Cefepime, a fourth generation cephalosporin antibiotic, commonly causes injection site reactions, rash, nausea, diarrhea, headache, and fever, but it can also trigger neurotoxicity that shows up as confusion, agitation, hallucinations, myoclonus, seizures, or nonconvulsive status epilepticus, especially in older adults, people with kidney impairment, or those receiving doses that are too high. Confusion linked to cefepime typically appears within one to several days of starting treatment and usually improves within days after the dose is reduced or the drug is stopped, though timing and severity vary. Other serious reactions to watch for include allergic or anaphylactic responses, Clostridioides difficile associated diarrhea, and blood count or liver enzyme changes. Because new confusion during antibiotic therapy can also stem from infection itself, other medications, or metabolic problems, there are several important factors to consider before assuming the cause. See below to understand more about which symptoms warrant urgent care and how dosing adjustments are made.
If you or someone you care for develops confusion, twitching, or unusual symptoms while taking cefepime, sorting out the cause quickly matters, since neurotoxicity often reverses once the dose is corrected. A free, instant, online symptom check can help you organize what you are experiencing, highlight red flags that need immediate attention, and prepare clear questions for your clinician so next steps happen faster.
Last reviewed for medical accuracy: 09/28/2026
Cefepime is a fourth-generation cephalosporin antibiotic used to treat a wide range of bacterial infections, including pneumonia, urinary tract infections, skin infections, and intra-abdominal infections. It’s given by intravenous (IV) or intramuscular (IM) injection in a hospital or clinical setting. Like all antibiotics, cefepime helps your body fight off bacteria—but it can also cause side effects.
Most people tolerate cefepime well. The most frequently reported side effects include:
These reactions are usually mild and go away on their own. If you notice persistent nausea, severe diarrhea, or a rash that spreads quickly, let your healthcare provider know.
While uncommon, some side effects require prompt medical attention:
One of the most important—but less well-known—risks with cefepime is neurotoxicity. This can show up as confusion, seizures, and other changes in mental status.
Neurotoxicity is an umbrella term for nerve-related side effects. With cefepime, these can include:
Cefepime can cross the blood-brain barrier, especially in people with reduced kidney function. When the drug builds up in the bloodstream, it may interfere with GABA (a brain chemical that calms nerve activity), leading to the symptoms above.
Certain factors increase the chance of cefepime side effects, especially neurotoxicity:
Your care team should adjust your cefepime dose based on your kidney function (creatinine clearance) and monitor you closely if you have any of these risk factors.
Keep an eye out for any new or worsening symptoms while on cefepime. Early recognition helps prevent serious complications. Report any of the following to your healthcare provider immediately:
• Changes in mental status
• Neurological signs
• Allergic reaction symptoms
• Severe gastrointestinal distress
• Kidney or fluid changes
You and your healthcare team can take steps to minimize side effects:
• Dose adjustment
• Regular monitoring
• Hydration
• Medication review
• Shortest effective duration
Some symptoms may signal a life-threatening reaction. Seek emergency care or call your doctor right away if you experience:
For less urgent concerns—like mild confusion, headache, or gastrointestinal upset—you may start with a free, online symptom check, using the doctor approved Ubie Symptom Checker.
Check your symptoms here: free, online symptom check, using the doctor approved Ubie Symptom Checker
Cefepime is a powerful antibiotic that can treat serious infections. While most people tolerate it well, it’s important to know about potential side effects—especially neurotoxicity, which can present as confusion or seizures.
To stay safe:
Always discuss any serious or life-threatening issues with your healthcare provider. If you have questions about cefepime side effects or need personalized medical advice, reach out to your doctor right away.
(References)
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* Balderia PG, Chandorkar A, Kim Y, Patnaik S, Sloan J, Newman GC. Dosing Cefepime for Renal Function Does Not Completely Prevent Neurotoxicity in a Patient With Kidney Transplant. J Patient Saf. 2018 Jun;14(2):e33-e34. doi: 10.1097/PTS.0000000000000225. PMID: 26102002.
* Lindsay H, Gruner S, Brackett J. Cefepime-Induced Neurotoxicity Despite Dose Adjustment for Renal Disease: A Brief Report and Review of the Literature. J Pediatric Infect Dis Soc. 2017 Jun 1;6(2):199-201. doi: 10.1093/jpids/piw022. PMID: 27147713.
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