Randomized double blind placebo controlled trial of vitamin D supplements, with or without calcium supplementation, versus placebo in reduction of recurrences in BPPV.
Age 18 years or older
2 or more distinct episodes of benign paroxysmal positional vertigo within a 12-month period on history
At least 1 episode diagnosed based on physical examination by trained study personnel, meeting the diagnostic criteria of the Bárány Society
Episodes separated in time, with a minimum of 1 week symptom-free between episodes
have another identifiable cause of vertigo identified on history or physical examination
have a history of allergy or medically significant adverse reaction to vitamin D or calcium carbonate
have a chronic medical disorder which is a contraindication to vitamin D or calcium carbonate supplementation, including uncontrolled hyperparathyroidism, nephrolithiasis, or GI malabsorption disorders
are on loop diuretic agents or thiazides