Study	Reason for exclusion
Amery 1988	No original data ‐ review
Anonymous 1979	No original data ‐ review
Banerjee 1991	Study on treatment of acute migraine attacks
Carroll 1990	Did not include a comparison with placebo or another drug
Cortelli 1985	Not randomised or quasi‐randomised clinical study
de Bock 1997	Not randomised or quasi‐randomised clinical study
Diamond 1987	Not randomised or quasi‐randomised clinical study
Fuller 1990	Study on treatment of acute migraine attacks
Havanka‐Kann. 1988	Did not include a comparison with placebo or another drug
Holroyd 1995	Did not include a comparison with placebo or another drug
Julien 1976	Not randomised or quasi‐randomised clinical study
Montastruc 1992	No original data ‐ review
Penzien 1990	Did not include a comparison with placebo or another drug
Raveau‐Landon 1988	No original data ‐ review
Rosen 1983	Not randomised or quasi‐randomised clinical study
Schmidt 1991	Not randomised or quasi‐randomised clinical study
Sovak 1981	Did not include a comparison with placebo or another drug
Steardo 1982	Open trial with unclear method of allocation
Tfelt‐Hansen 1986	No original data ‐ review
Turner 1984	No original data ‐ review
Verspeelt 1996a	Not randomised or quasi‐randomised clinical study
Verspeelt 1996b	Not randomised or quasi‐randomised clinical study
Winther 1990	Observation period less than 4 weeks
Wober 1991	Not randomised or quasi‐randomised clinical study