TABLE 1.

Search stratetegy

Database	Search terms (Boolean operators)	#Records
PubMed	(((((online [Title) OR (internet [Title)) AND (pharmac*[Title)) AND (buy [Title)) OR (purchas*[Title)) AND (drug [Title))	426
	(((((online [Title) OR (internet [Title)) AND (pharmac*[Title)) AND (buy [Title)) OR (purchas*[Title)) AND (medic*[Title))
Web of Science	(((((TI=(online)) OR TI=(internet)) AND TI=(pharmac*)) AND TI=(buy)) OR TI=(purchas*)) AND TI=(medic*) and Review Article (Exclude–Document Types) and Enriched Cited References and Article (Document Types) and Proceeding Paper (Exclude–Document Types) and English (Languages)	486
	(((((TI=(online)) OR TI=(internet)) AND TI=(pharmac*)) AND TI=(buy)) OR TI=(purchas*)) AND TI=(drug) and Article (Document Types) and English (Languages) and Article or Early Access (Document Types)
	((((TI=(social media)) AND TI=(pharmac*)) AND TI=(buy)) OR TI=(purchas*)) AND TI=(drug)) and Review Article (Exclude–Document Types) and Enriched Cited References and Article (Document Types) and Proceeding Paper (Exclude–Document Types) and English (Languages)
	((((TI=(social media)) AND TI=(pharmac*)) AND TI=(buy)) OR TI=(purchas*)) AND TI=(medic*)) and Review Article (Exclude–Document Types) and Enriched Cited References and Article (Document Types) and Proceeding Paper (Exclude–Document Types) and English (Languages)
Scopus	(TITLE-ABS-KEY (online) OR TITLE-ABS-KEY (internet) OR TITLE-ABS-KEY (social AND media) AND TITLE-ABS-KEY (pharmac*) AND TITLE-ABS-KEY (buy) OR TITLE-ABS-KEY (purchas*) AND TITLE-ABS-KEY (drug) AND TITLE-ABS-KEY (medic*)) AND (LIMIT-TO DOCTYPE,“ar”)) AND (LIMIT-TO (LANGUAGE,“English”)) AND (LIMIT-TO (SRCTYPE,“j"))	258