Spontaneous Bacterial Peritonitis

Warning

Clinical features

  • Abdominal pain
  • Worsening abdominal distension
  • Known chronic liver disease

Investigations

  • Ascitic fluid (in universal container and in blood culture bottles)
  • Blood culture

Infection Control

Basic universal precautions

Treatment

TEMOCILLIN IV 2g 8 hourly 

PLUS

AMOXICILLIN IV 1g 8 hourly 

PLUS

METRONIDAZOLE PO 400mg 8 hourly

(Metronidazole may instead be given intravenously 500mg 8 hourly if the oral route is unavailable)

 If known / suspected MRSA:

TEMOCILLIN IV 2g 8 hourly 

PLUS

VANCOMYCIN IV (dose as per calculator) 

PLUS

METRONIDAZOLE PO 400mg 8 hourly

(Metronidazole may instead be given intravenously 500mg 8 hourly if the oral route is unavailable)

If true penicillin allergy:

TIGECYCLINE* IV 100mg initially, followed by 50mg 12 hourly

*TIGECYCLINE is usually a protected antibiotic but can be accessed without restriction for this indication only. 

 

 When improving, consider IV to Oral switch as for intra-abdominal sepsis

Duration: 5 days in total (IV+Oral)

Editorial Information

Last reviewed: 21/04/2026

Next review date: 21/04/2029