Study	Reason for exclusion
Bacia 1980	Non‐randomised controlled study
Bensch 1977	Claimed "Children were accepted for the study provided that all available drugs had already been tried in adequate doses...", but it was stated that at least 2 of the included participants had not yet tried 2 antiepileptic drugs, and did not meet our inclusion criteria of participants. In addition, it is unclear if this study was randomised.
Birket‐Smith 1973	Non‐randomised controlled study
Dahlin 2000	Only some of the participants had medically resistant epilepsy, and the treatment period was less than 8 weeks.
Dincheva 1984	Non‐randomised controlled study
Edwards 1973	Non‐randomised controlled study
Mikkelsen 1976	Non‐randomised controlled study
Miyasaka 1977	The full text of the study is unavailable, and we are unable to establish contact details at this time. Given the age of the study, it is unlikely that we will be able to contact the study authors in the future.
Nanda 1977	Non‐randomised controlled study
Shakir 1979	Full characteristics (randomisation process, blinding information, medication history of the participants, etc.) and outcome data before cross‐over not reported. We attempted to contact the author. Given the age of the study, it is unlikely that we will be able to contact the study authors in the future.
Suzuki 1978	The full text of the study is unavailable, and unable to establish contact details at this time. Given the age of the study, it is unlikely that we will be able to contact the study authors in the future.
Yamatogi 1997	Single‐blinded randomised controlled study