Which medication is a first-line treatment for both vestibular neuritis and labyrinthitis?

Corticosteroids are considered a first-line treatment for both vestibular neuritis and labyrinthitis due to their anti-inflammatory effects. These conditions are often characterized by inflammation of the inner ear structures, which can lead to symptoms such as vertigo, dizziness, and balance disturbances. Corticosteroids help to reduce this inflammation, potentially alleviating symptoms and promoting faster recovery.

When vestibular neuritis is suspected, particularly in cases linked to viral infections, corticosteroids have been shown to improve outcomes by addressing the underlying inflammation. Similarly, in labyrinthitis, which involves the inflammation of both the vestibular and auditory portions of the inner ear, corticosteroids can help manage symptoms and reduce inflammation.

Antihistamines may provide symptomatic relief for nausea and dizziness but do not target the underlying inflammation. Diuretics are typically used for conditions like Meniere's disease and are not relevant here. Intranasal steroids are primarily used for nasal and sinus conditions, not for vestibular inner ear inflammation. Thus, corticosteroids are the most appropriate first-line option in addressing both vestibular neuritis and labyrinthitis effectively.