What do systematic reviews say?

H2 receptor antagonists vs antacids

H2 receptor antagonists showed no clear difference in nosocomial pneumonia compared with antacids (low certainty).

• Interventions for preventing upper gastrointestinal bleeding in people admitted to intensive care units 2018 · Cochrane Headline outcomes only
  RR 1.05 [0.81, 1.36]
  4 studies · 581 participants
  Low