What do systematic reviews say?

H2 receptor antagonists vs antacids

H2 receptor antagonists probably leads to higher number of participants requiring blood transfusion compared with antacids (moderate certainty).

• Interventions for preventing upper gastrointestinal bleeding in people admitted to intensive care units 2018 · Cochrane Headline outcomes only
  RR 2.49 [1.35, 4.62]
  6 studies · 744 participants
  Moderate