NCT01729767.

Study name	Efficacy of antiviral medications in controlling vertigo attacks of patients with Meniere's disease
Methods	Parallel‐group randomised controlled trial with approximately 50 days of treatment and further 40 days of follow‐up
Participants	Participants with Ménière's disease Aged 18 to 85 years With at least 2 episodes of vertigo per month, severely interfering with function and lasting for at least 20 minutes Not on any medication for the preceding 3 months Target sample size of 80 participants
Interventions	Aciclovir 400 mg 5 times daily for 1 month, then 3 times daily for 10 days, then twice daily for 10 days, compared to placebo tablets All participants will be encouraged to take a low‐salt diet
Outcomes	Vertigo Hearing loss Aural fullness Tinnitus No further details on the methods of outcome assessment
Starting date	August 2011. Study was due to have completed by December 2012.
Contact information	Masoud Motesadi motesadi@sina.tums.ac.ir Parisa Mazaheri mazaheri.parisa@gmail.com
Notes	We have attempted to contact the trial contacts to ascertain whether this study is ongoing, or was ever published, as we have been unable to locate any publications that relate to it. We are awaiting a response.