Zacharof 1997.

Methods	Data collection: no information provided. Exclusion from analysis: no information provided. Follow‐up period: no information provided.
Participants	Greece Hospitalised cirrhotic patients with upper gastrointestinal haemorrhage. Etiology of bleeding: no information provided. Source of bleeding determined by emergency endoscopy. Child‐Pugh class A/B/C: not information provided.
Interventions	Experimental: oral ciprofloxacin 500 mg/day during seven days. Control: no antibiotic prophylaxis.
Outcomes	Prevent bacterial infections.
Notes	Data extracted from an abstract, and confirmed by the authors. Authors were contacted for the first version of this review, and additional information was received.
Risk of bias
Bias	Authors' judgement	Support for judgement
Adequate sequence generation?	Low risk	The sequence was generated using a table of random numbers.
Allocation concealment?	Low risk	Sequentially administered by a pharmacist not involved in the trial.
Blinding? All outcomes	High risk	Not a blinded trial.
Incomplete outcome data addressed? All outcomes	Low risk	The report include all the expected outcomes.
Free of selective reporting?	Unclear risk	Insufficient information to permit judgement.
Free of other bias?	Unclear risk	Insufficient information to permit judgement.
Intention to treat analysis?	Unclear risk	No information provided.
Sample calculation?	Unclear risk	No information provided.

b.i.d. = twice (two times) a day. 
 hs = hours.