What Gravol does
Gravol is the brand name for dimenhydrinate, a first-generation antihistamine that acts as a vestibular suppressant. It works by dampening signals from the vestibular system — the inner ear structures responsible for detecting head movement and spatial orientation. By reducing the intensity of these signals, Gravol decreases the sensation of spinning and the nausea that typically accompanies it.
It is available over the counter and is one of the most common medications Canadians reach for when vertigo strikes. For acute symptom relief, it has a legitimate role. But it is important to understand what Gravol does and does not do — because using it beyond the acute phase can actually interfere with recovery.
When Gravol is appropriate
During the first 24 to 48 hours of a severe vertigo attack, Gravol can provide meaningful relief. The acute phase of conditions like vestibular neuritis often involves intense, sustained vertigo with severe nausea and vomiting. In this window, vestibular suppressants serve a practical purpose — they make an extremely distressing experience more manageable and help patients eat, drink, and rest.
If you are waiting for a vestibular assessment and your symptoms are severe, short-term Gravol use is reasonable. Most clinicians and clinical guidelines support brief vestibular suppressant use during the acute phase of vestibular illness.
The key word is brief.
Why Gravol is not a treatment
Gravol reduces the sensation of vertigo. It does not address the cause.
If your vertigo is caused by BPPV — the most common cause — tiny calcium crystals have become displaced in one of your semicircular canals. Gravol does not move those crystals. They remain in the wrong position, and the vertigo will return every time you move your head into the triggering position. The only effective treatment for BPPV is a repositioning manoeuvre performed by a trained clinician, which resolves the condition in over 90% of cases.
If your vertigo is caused by vestibular neuritis — inflammation of the vestibular nerve, usually following a viral illness — Gravol does not reduce the inflammation or repair the nerve. It masks the symptoms while the underlying condition follows its own course.
This distinction matters because many people take Gravol for days or weeks, assuming it is helping them recover. It is not helping them recover. It is helping them feel less dizzy while recovery either happens on its own or stalls.
The compensation problem
This is the most clinically important reason to limit Gravol use: vestibular suppressants interfere with vestibular compensation.
Vestibular compensation is the brain's natural recovery process after vestibular injury. When the inner ear on one side is damaged or sending inaccurate signals, the brain gradually learns to recalibrate — relying more on the healthy side, integrating visual and proprioceptive input to fill the gap, and adjusting its expectations about head movement. This process is the foundation of recovery from vestibular neuritis, labyrinthitis, and many other vestibular conditions.
Compensation depends on the brain receiving vestibular signals — even inaccurate ones. The mismatch between what the damaged ear sends and what the brain expects is precisely what drives the adaptive process. Vestibular suppressants reduce these signals, which reduces the stimulus for compensation.
This is not a theoretical concern. It is well established in the clinical literature. Multiple studies and clinical practice guidelines explicitly recommend limiting vestibular suppressant use to the first 48 to 72 hours of acute vestibular illness. Prolonged use is associated with delayed compensation, persistent dizziness, and poorer long-term outcomes.
In practical terms: taking Gravol for weeks may be the reason your dizziness is not improving.
What works instead
Effective vertigo treatment depends on accurate diagnosis, because different causes require different interventions.
For BPPV: The appropriate repositioning manoeuvre — Epley, Semont, BBQ roll, or others depending on the canal involved — resolves the condition by physically moving the displaced crystals. This is typically done in a single session and takes 10 to 15 minutes. No medication addresses the cause.
For vestibular neuritis: Vestibular rehabilitation therapy (VRT) is the evidence-based treatment. A structured programme of gaze stabilisation exercises, balance training, and habituation exercises provides the controlled sensory input that drives compensation. Multiple randomised controlled trials and Cochrane reviews support VRT for accelerating recovery from vestibular neuritis.
For vestibular migraine: Management typically involves trigger identification, lifestyle modification, and sometimes preventive medication prescribed by a physician — alongside vestibular rehabilitation for associated dizziness and motion sensitivity.
In each case, the treatment targets the specific mechanism causing the vertigo. Gravol does not target any of these mechanisms.
A common pattern we see in clinic
Many patients arrive for their first vestibular assessment after weeks or months of taking Gravol intermittently. They describe a pattern: the vertigo started suddenly, they took Gravol and it helped temporarily, but the dizziness kept returning. Over time, they developed a more persistent background unsteadiness and reduced confidence with movement.
In many of these cases, the original vertigo was caused by BPPV that was never repositioned, or by vestibular neuritis where compensation was delayed by ongoing suppressant use. Once the cause is identified and the appropriate treatment applied — repositioning for BPPV, structured VRT for neuritis — improvement is often rapid.
The Gravol was not wrong in the first few days. It simply was never meant to be the treatment.
The bottom line
Gravol manages the symptom. Vestibular therapy treats the cause.
If you have been taking Gravol for vertigo and your symptoms have not resolved, the most productive next step is a vestibular assessment to determine what is driving your dizziness and match it with the right treatment.
Book your assessment or call 905-635-5711. No referral needed.
