A patient with suspected bacterial meningitis presents with fever, neck stiffness, and photophobia. Lumbar puncture is delayed due to papilledema on fundoscopy. Which antibiotic should be given IMMEDIATELY before LP or CT brain?

• A IV vancomycin alone
• B IV ceftriaxone 2g (plus vancomycin and dexamethasone) ✓
• C Oral amoxicillin 500 mg
• D Wait for CT then LP before any antibiotic

Explanation

In suspected bacterial meningitis, immediate blood cultures followed by IV ceftriaxone (plus vancomycin to cover resistant Pneumococcus and dexamethasone to reduce cerebral edema and hearing loss) should be given before CT or LP if there is clinical suspicion of raised intracranial pressure (papilledema, focal deficit, impaired consciousness). Delaying antibiotics for imaging increases mortality. The IDSA/AHA guidelines are clear: do not delay empiric antibiotics for CT or LP in this scenario. Oral antibiotics are never appropriate for bacterial meningitis.

Reference: Harrison's Principles of Internal Medicine, 21st ed.

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Written and medically reviewed by the StethoPrep medical team.