Meropenem and Seizure Threshold

Seizure Risk with Meropenem

Meropenem has a documented pro-convulsive activity, with a relative pro-convulsive activity of 16 compared to penicillin G (which has a reference value of 100) 1, 2
In comparison, imipenem has a higher pro-convulsive activity (71), while other beta-lactams like cefepime (160) and cefazolin (294) have significantly higher seizure risk 2

Renal failure is the main risk factor associated with neurological toxicity of beta-lactams, including meropenem, as it may cause rapid and significant accumulation of the drug 1, 2
For meropenem, trough concentrations above 64 mg/L have been associated with neurotoxicity in 50% of patients 2
High plasma concentrations of meropenem, particularly when the free concentration exceeds eight times the MIC, may increase the risk of neurological disorders 3

Meropenem should be used with caution in patients with a history of seizures or with clinical factors that may increase the risk of seizures 1, 2
When the free minimum concentration normalized to the MIC for Pseudomonas aeruginosa exceeds 8, significant deterioration of neurological status occurred in approximately two-thirds of ICU patients treated with meropenem 2
Therapeutic drug monitoring should be considered in patients experiencing unexplained neurological manifestations, with temporary suspension of meropenem administration if necessary 2
Unlike some other antibiotics, meropenem can be used with appropriate monitoring and dosing adjustments 4