Table 1.

Databases employed and respective key terms used.

Databases and search terms used to extract all available and relevant articles	No. of articles retrieved (n)
SCOPUS	n = 354
1 “seizure” OR “epilepsy” AND “metformin”
2 “seizure” OR “epilepsy” AND “oral hypoglycemic agents” OR “oral antidiabetic agents”
Sciences-Direct	n = 237
1 “seizure” OR “epilepsy” AND “metformin”
2 “seizure” OR “epilepsy” AND “oral hypoglycemic agents” OR “oral antidiabetic agents”
PubMed	n = 28
1 “epilepsy [Mesh] OR epilepsy∗[tw]”
2 “seizure [Mesh] OR seizure∗[tw]”
3 “metformin [Mesh] OR Metformin∗[tw]”
4 “oral hypoglycemic agents [Mesh] OR Oral hypoglycemic agents∗[tw]”
Finally, search for (#1 OR # 2) AND (# 3 OR # 4)
Grey literatures (Google scholar and regular Google search)
(1) Antiepileptic activities of metformin OR epilepsy and metformin
(2) Antiseizure actions of metformin OR seizure and metformin