Serum or plasma concentration of ceftizoxime (antibiotic, β-lactam)

Why Is This Test Done?

Your doctor may order this test if you’re receiving ceftizoxime therapy, particularly for serious infections like sepsis, bacterial meningitis, or severe intra-abdominal or gynecological infections. It helps prevent excessive antibiotic exposure, which can cause side effects, and ensures the drug remains effective against your infection.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm or vein to draw blood. The process is quick and typically painless. If you’re on IV ceftizoxime, your blood sample may be taken from the same site.

What the Test Results Mean

Results are compared to your specific dosing schedule and infection type. Low levels may indicate the antibiotic isn’t working well, while very high levels could signal toxicity. Your doctor will interpret results in the context of your medical history and treatment plan.

Possible Side Effects or Risks

While rare, ceftizoxime can cause allergic reactions (e.g., rash, difficulty breathing), kidney issues, or nerve problems. If you experience severe pain, swelling at the injection site, or unusual symptoms like dizziness or nausea, contact your doctor immediately.