What do systematic reviews say?

Heparin vs placebo

Heparin leads to higher bleeding ‐ minor Treatment duration 28 ‐ 42 days compared with placebo (high certainty).

• Anticoagulants (extended duration) for prevention of venous thromboembolism following total hip or knee replacement or… 2016 · Cochrane Headline outcomes only
  OR 2.01 [1.43, 2.81]
  5 studies · 2500 participants
  High