Study	Reason for exclusion
Amesbury 2004	A case report only, not a randomised controlled trial.
Baines 1985	Open prospective case series, not a randomised controlled trial. Examined multiple medications & unclear which resulted in effect.
Benze 2012	Review article. Not a randomised controlled trial.
Dietz 2013	Review article. Not a randomised controlled trial.
Eisenchlas 2005	Not a randomised controlled trial. All participants given levomepromazine at different doses, no control group, no randomisation.
Ell 1983	Prophylaxis of chemotherapy‐induced vomiting. Population not restricted to adults receiving palliative care.
Gordon 2014	Review article. Not a randomised controlled trial.
Higi 1980	Prophylaxis of chemotherapy‐induced vomiting. Population not restricted to adults receiving palliative care.
Kennett 2004	Not a randomised controlled trial. All participants given levomepromazine at different doses, no control group, no randomisation.
McCabe 2003	Treatment of chemotherapy‐induced vomiting. Population not restricted to adults receiving palliative care. Not a randomised controlled trial.
Sgouros 2003	Prophylaxis of chemotherapy‐induced vomiting. Population not restricted to adults receiving palliative care. Abstract of poster presentation only.
Twycross 1997	Narrative review. Not a randomised controlled trial. Unpublished observational data included.