CENTRAL	PubMed	EMBASE (Ovid)
#1 MeSH descriptor: [Dizziness] explode all trees #2 MeSH descriptor: [Vertigo] explode all trees #3 MeSH descriptor: [Meniere Disease] explode all trees #4 vertig* or bppv or meniere* or vestibular or (endolymphatic and hydrops) or (labyrinth and hydrops) or (labyrinth and syndrome) or (cochlea and hydrops) #5 lightheaded* or imbalance or disorientat* or dizzy or dizziness or (self next motion) or (illusion* near movement*) #6 #1 or #2 or #3 or #4 or #5 #7 MeSH descriptor: [Betahistine] explode all trees #8 BETAHISTIN* or BETAISTINA or SERC or AEQUAMEN or BETASERC or BETASERK or BEATSERKA or EXTOVYL or FIDIUM or LECTIL or LOBIONE or MEGINALISK or MELOPAT or MENIACE or MERISLON or MICROSER or RIBRAIN or VASOMOTAL or (BY next vertin) #9 #7 or #8 #10 #6 and #9	#1 "Dizziness"[Majr] #2 "Vertigo"[Mesh] #3 "Meniere Disease"[Mesh] #4 (vertig* or bppv or meniere* or vestibular or endolymphatic and hydrops or (labyrinth and hydrops) or (labyrinth and syndrome) or (cochlea and hydrops)) #5 (lightheaded* or imbalance or disorientat* or dizzy or dizziness or (self and motion) or (illusion* and movement*)) #6 (#1 OR #2 OR #3 OR #4 OR #5) #7 "Betahistine"[Mesh] #8 (BETAHISTIN* or BETAISTINA or SERC or AEQUAMEN or BETASERC or BETASERK or BEATSERKA or EXTOVYL or FIDIUM or LECTIL or LOBIONE or MEGINALISK or MELOPAT or MENIACE or MERISLON or MICROSER or RIBRAIN or VASOMOTAL or "BY vertin" or BY‐vertin) #9 #7 OR #8 #10 (#9 AND #6)	1 *dizziness/ 2 exp vertigo/ 3 exp Meniere disease/ 4 (vertig* or bppv or meniere* or vestibular or (endolymphatic and hydrops) or (labyrinth and hydrops) or (labyrinth and syndrome) or (cochlea and hydrops)).tw. 5 (lightheaded* or imbalance or disorientat* or dizzy or dizziness or (self adj6 motion) or (illusion* adj6 movement*)).tw. 6 1 or 2 or 3 or 4 or 5 7 exp betahistine/ 8 (BETAHISTIN* or BETAISTINA or SERC or AEQUAMEN or BETASERC or BETASERK or BEATSERKA or EXTOVYL or FIDIUM or LECTIL or LOBIONE or MEGINALISK or MELOPAT or MENIACE or MERISLON or MICROSER or RIBRAIN or VASOMOTAL or (BY adj6 vertin)).tw. 9 7 or 8 10 6 and 9
CINAHL (EBSCO)	Web of Science (Web of Knowledge)	Trial Registries
S1 (MM "Dizziness") S2 (MH "Vertigo") S3 (MH "Endolymphatic Hydrops+") OR (MH "Meniere's Disease") S4 TX vertig* or bppv or meniere* or vestibular or (endolymphatic and hydrops) or (labyrinth and hydrops) or (labyrinth and syndrome) or (cochlea and hydrops) S5 TX lightheaded* or imbalance or disorientat* or dizzy or dizziness or (self n6 motion) or (illusion* n6 movement*) S6 S1 OR S2 OR S3 OR S4 OR S5 S7 TX BETAHISTIN* or BETAISTINA or SERC or AEQUAMEN or BETASERC or BETASERK or BEATSERKA or EXTOVYL or FIDIUM or LECTIL or LOBIONE or MEGINALISK or MELOPAT or MENIACE or MERISLON or MICROSER or RIBRAIN or VASOMOTAL or (BY n6 vertin) S8 S6 AND S7	#1 TS=(vertig* or bppv or meniere* or vestibular or (endolymphatic and hydrops) or (labyrinth and hydrops) or (labyrinth and syndrome) or (cochlea and hydrops)) #2 TS=(lightheaded* or imbalance or disorientat* or dizzy or dizziness or (self and motion) or (illusion* and movement*)) #3 #2 OR #1 #4 TS=(BETAHISTIN* or BETAISTINA or SERC or AEQUAMEN or BETASERC or BETASERK or BEATSERKA or EXTOVYL or FIDIUM or LECTIL or LOBIONE or MEGINALISK or MELOPAT or MENIACE or MERISLON or MICROSER or RIBRAIN or VASOMOTAL or "by vertin" or by‐vertin) #5 #4 AND #3	ClinicalTrials.gov (vertigo OR vertiginous OR bppv OR meniere OR menieres OR vestibular OR dizzy OR dizziness) AND (betahistine OR betahistin OR serc OR betaserc) ICTRP betahistine AND Meniere* OR serc AND Meniere* OR betahistine and vertigo* OR serc AND vertigo* OR dizziness AND betahistine OR dizziness AND serc OR dizzy AND betahistine OR dizzy AND serc OR vestibular AND betahistine OR vestibular AND serc OR bppv AND betahistine OR bppv AND serc