Does topiramate work for vestibular migraine?

Yes, Topiramate will help.

"Vestibular Migraine Treatment
Treatment for vestibular migraine is similar to that for other migraine headaches. Use of meclizine or other abortive medications that suppress the vestibular system should be minimized, and only used occasionally as needed, during an episode for instance.

If the person is getting frequent attacks, the doctor may recommend one or more of these medications, as well as others:

Beta-blockers

Calcium channel blockers

Tricyclic antidepressants

Serotonin or serotonin/norepinephrine reuptake inhibitors (SSRIs or SNRIs)

Topiramate

People with vestibular migraines can reduce the number and intensity of episodes by maintaining a regular sleep and meal schedule, avoiding triggers, exercising regularly and managing stress."

Source; JOHNS HOPKINS MEDICINE