Meropenem Dosing: Standard Regimens
For adults with normal renal function, administer meropenem 1 gram IV every 8 hours for most serious infections, including complicated intra-abdominal infections, carbapenem-resistant Enterobacterales (CRE), and hospital-acquired pneumonia 1.
Adult Dosing by Indication
Standard Infections
- Complicated intra-abdominal infections: 1 gram IV every 8 hours 2, 1
- Complicated skin/soft tissue infections: 500 mg IV every 8 hours (increase to 1 gram every 8 hours if Pseudomonas aeruginosa suspected) 1
- Necrotizing infections (mixed): 1 gram IV every 8 hours 3
Multidrug-Resistant Organisms
- CRE bloodstream infections: 1 gram IV every 8 hours by extended infusion (3-hour infusion preferred when MIC ≥8 mg/L) 4
- CRE complicated intra-abdominal infections: 1 gram IV every 8 hours by extended infusion 4
- Drug-resistant tuberculosis (adjunctive): 1 gram IV 3 times daily 5
Administration Method
Administer as IV infusion over 15-30 minutes for standard dosing 1. The 1-gram dose may alternatively be given as IV bolus over 3-5 minutes 1.
For critically ill patients or resistant organisms with MIC ≥4 mg/L, use extended infusion (3-4 hours) or continuous infusion to optimize time above MIC 4, 6, 7. Extended infusion significantly improves pharmacodynamic target attainment in severe sepsis 7.
Pediatric Dosing (≥3 Months)
- Complicated skin/soft tissue infections: 10 mg/kg IV every 8 hours (max 500 mg/dose) 1
- Complicated intra-abdominal infections: 20 mg/kg IV every 8 hours (max 1 gram/dose) 1
- Meningitis: 40 mg/kg IV every 8 hours (max 2 grams/dose) 1
- Neonates <3 months: Dosing based on gestational and postnatal age, ranging from 20-30 mg/kg every 8-12 hours 1
Renal Dose Adjustment
Reduce dose when creatinine clearance ≤50 mL/min 1:
| CrCl (mL/min) | Dose | Frequency |
|---|---|---|
| >50 | Standard dose | Every 8 hours |
| 26-50 | Standard dose | Every 12 hours |
| 10-25 | Half standard dose | Every 12 hours |
| <10 | Half standard dose | Every 24 hours |
Special Renal Situations
- Augmented renal clearance (CrCl 140-200 mL/min): Consider 2 grams every 8 hours as 2-6 hour infusion or continuous infusion to maintain adequate concentrations 8
- ECMO patients: 1 gram every 8 hours as continuous infusion achieves safe and effective concentrations 9
- Prolonged intermittent RRT: 1000 mg loading dose, then 500-1000 mg every 8-12 hours depending on session duration and frequency 10
Critical Dosing Considerations
Always use a loading dose in critically ill patients regardless of renal function, as volume of distribution is typically increased 6. The loading dose should equal the standard single dose (500 mg or 1 gram depending on indication).
For P. aeruginosa infections, use higher doses: 1 gram every 8 hours in adults, 20 mg/kg every 8 hours in children 1.
Carbapenem stability limits continuous infusion: Meropenem remains stable for 6-12 hours at 25°C, requiring preparation of fresh solutions every 6-12 hours for continuous infusion 6. This differs from imipenem (2-3 hour stability) and ertapenem (longer stability).
Therapeutic drug monitoring should be considered in patients with augmented renal clearance, renal replacement therapy, or when treating resistant organisms with elevated MICs 6, 8.