Clindamycin Intravenous Dosing
For adults with serious infections, administer clindamycin 600-900 mg IV every 8 hours; for severe infections including those caused by Bacteroides fragilis, use 1,200-2,700 mg/day divided every 6-8 hours, with doses up to 4,800 mg/day in life-threatening situations. 1
Adult Dosing
Standard Serious Infections
- 600-1,200 mg/day divided into 2,3, or 4 equal doses for aerobic gram-positive cocci and susceptible anaerobes 1
- Typical regimen: 600-900 mg IV every 8 hours 2, 3, 4
Severe Infections
- 1,200-2,700 mg/day divided into 2,3, or 4 equal doses for proven or suspected Bacteroides fragilis, Peptococcus species, or Clostridium species 1
- Life-threatening infections: Up to 4,800 mg/day may be administered 1
Specific Clinical Scenarios
- Necrotizing fasciitis (streptococcal): 600-900 mg IV every 8 hours combined with penicillin 2, 3
- MRSA infections (clindamycin-susceptible): 600 mg IV every 6-8 hours 4
- Community-acquired pneumonia: 600 mg IV every 8 hours 5, 6
Pediatric Dosing (Beyond Neonatal Period)
Children 1 Month to 16 Years
- Standard dose: 20-40 mg/kg/day divided into 3-4 equal doses 1
- Severe infections: Use higher end of dosing range (40 mg/kg/day) 1
- Alternative: 350 mg/m²/day for serious infections; 450 mg/m²/day for severe infections 1
Specific Pediatric Indications
- Necrotizing infections: 10-13 mg/kg/dose every 8 hours IV 2, 3
- MRSA pneumonia: 40 mg/kg/day every 6-8 hours IV 5, 6, 5
- Staphylococcal infections: 40 mg/kg/day every 6-8 hours IV 5, 6
- Osteomyelitis: 40 mg/kg/day every 6-8 hours IV 4
Neonates (Less Than 1 Month)
- 15-20 mg/kg/day divided into 3-4 equal doses 1
- Post-menstrual age (PMA) ≤32 weeks: 5 mg/kg every 8 hours 1
- PMA >32 to ≤40 weeks: 7 mg/kg every 8 hours 1
Administration Guidelines
IV Infusion Rates
- Concentration: Should not exceed 18 mg/mL 1
- Infusion rate: Should not exceed 30 mg/minute 1
- Standard infusion times:
- 300 mg in 50 mL over 10 minutes
- 600 mg in 50 mL over 20 minutes
- 900 mg in 50-100 mL over 30 minutes
- 1,200 mg in 100 mL over 40 minutes 1
Important Caveat
Do not administer more than 1,200 mg in a single 1-hour infusion 1
IM Administration
Special Populations
Hepatic Impairment
No dose adjustment required despite slightly increased elimination half-life in patients with markedly reduced hepatic function 1. However, one study found 5-hour serum levels nearly 3-fold higher (24.3 vs 8.3 mcg/mL) in patients with moderate-to-severe hepatic dysfunction, suggesting potential need for dose modification in severe liver disease 7.
Renal Impairment
No dose adjustment required - hemodialysis and peritoneal dialysis do not effectively remove clindamycin 1
Obesity
Dose based on total body weight regardless of obesity in both adults and children 1. Clindamycin clearance and volume of distribution normalized by total body weight are comparable regardless of obesity 1
Clinical Considerations
Combination Therapy
When treating necrotizing fasciitis or mixed infections, clindamycin is typically combined with:
- Penicillin for streptococcal infections 2, 3
- Vancomycin if MRSA suspected 2, 3
- Aminoglycosides for polymicrobial infections 8
Drug Interactions
Critical interaction with rifampicin: Concomitant rifampicin increases clindamycin clearance by 3-fold and dramatically reduces oral bioavailability (from 56% to 4-11% depending on rifampicin dose). When combined with rifampicin, clindamycin must be given IV at doses of at least 3,600-4,800 mg/day, preferably by continuous infusion 9, 10