Study	Reason for exclusion
Abubakar 2010	No placebo control group. Compared two different antivenoms.
Ariaratnam 2001	No placebo control group. Compared two different antivenoms.
Boyer 2013	No placebo control group. Compared two different antivenoms.
Bush 2014	No placebo control group. Compared two different antivenoms.
Cardoso 1993	No placebo control group. Compared three different antivenoms.
Cherian 1998	No placebo control group. Compared two different doses of antivenom.
Dart 2001	No placebo control group. Compared two different doses of antivenom.
Isbister 2013	No placebo control group. Compared antivenom versus antivenom with fresh frozen plasma.
Jorge 1995	No placebo control group. Compared two different doses of antivenom.
Karnchanachetanee 1994	No placebo control group. Compared two different doses of antivenom.
Kothari 2001	No placebo control group. Compared two different doses of antivenom.
Meyer 1997	No placebo control group. Compared two different antivenoms.
Myint‐Lwin 1989	No placebo control group. Compared antivenom versus antivenom with heparin.
NCT00639951	No placebo control group. Compared two different doses of antivenom. Ongoing study.
NCT00868309	No placebo control group. Compared two different antivenoms. Ongoing study.
Otero 1996	No placebo control group. Compared two different antivenoms.
Otero 1999	No placebo control group. Compared two different antivenoms.
Otero 2006	No placebo control group. Compared two different antivenoms.
Otero‐Patino 1998	No placebo control group. Compared three different antivenoms.
Otero‐Patino 2012	No placebo control group. Compared two different antivenoms.
Pardal 2004	No placebo control group. Compared two different antivenoms.
Paul 2003	No placebo control group. Compared antivenom versus antivenom with heparin.
Paul 2004	No placebo control group. Compared two different doses of antivenom.
Paul 2007	No placebo control group. Compared antivenom versus antivenom with heparin.
Sellahewa 1994	No placebo control group. Compared antivenom versus antivenom with intravenous immunoglobulin.
Shah 1986	No placebo control group. Compared antivenom versus antivenom with heparin.
Smalligan 2004	No placebo control group. Compared three different antivenoms.
Srimannarayana 2004	No placebo control group. Compared three different doses of antivenom.
Tariang 1999	No placebo control group. Compared two different doses of antivenom.
Thomas 1985	No placebo control group. Compared two different doses of antivenom.
Warrell 1974	No placebo control group. Compared two different antivenoms.
Warrell 1976	No placebo control group. Compared antivenom versus antivenom with heparin.
Warrell 1980	No placebo control group. Compared two different antivenoms.
Warrell 1986	No placebo control group. Compared two different doses of antivenom.