A 48-year-old man with confirmed Meniere disease (low-frequency sensorineural hearing loss, episodic vertigo, tinnitus, aural fullness) has had 4–5 attacks per month for the past 6 months despite lifestyle modifications and salt restriction. What is the drug of choice for long-term prophylaxis to reduce attack frequency?

Explanation

## Prophylactic Management of Recurrent Meniere Disease Once Meniere disease is confirmed and attacks are **frequent and disabling**, prophylactic therapy is indicated to reduce attack frequency and severity. ### First-Line Prophylaxis: Diuretics **Key Point:** Diuretics (thiazide + potassium-sparing agent) are the **gold-standard first-line prophylactic therapy** for Meniere disease. ### Mechanism 1. Thiazide diuretic (e.g., hydrochlorothiazide 25 mg daily) - Reduces total body sodium and fluid volume - Decreases endolymphatic pressure in the inner ear 2. Potassium-sparing agent (e.g., amiloride 5 mg daily) - Prevents hypokalemia induced by thiazide - Synergistic effect on endolymph regulation **High-Yield:** The combination **hydrochlorothiazide + amiloride** is preferred over thiazide alone because it maintains potassium balance and provides superior endolymph volume control. ### Efficacy - Reduces attack frequency by **50–70%** in responders - Takes 2–4 weeks to show effect - Requires patient compliance and dietary sodium restriction (<2 g/day) - First-line because it is safe, reversible, and well-tolerated ### Alternative Prophylactic Agents | Agent | Role | Evidence | Limitations | |---|---|---|---| | **Betahistine** | Second-line vasodilator | Modest; mixed studies | Weak evidence; slower onset | | **Flunarizine** | Calcium channel blocker | Limited data in Meniere | Not standard; more for migraine-associated vertigo | | **Intratympanic corticosteroids** | Intratympanic injection | Emerging; adjunctive | Invasive; reserved for refractory cases | | **Intratympanic gentamicin** | Ablative therapy | High efficacy | Permanent hearing loss risk; last resort | **Clinical Pearl:** Diuretics work best when combined with **strict dietary sodium restriction** (<2 g/day) and adequate hydration. Without dietary compliance, efficacy is significantly reduced. **Mnemonic:** **DIURETICS = Decrease Endolymphatic Pressure** — the pathophysiologic basis of Meniere disease is endolymphatic hydrops; diuretics reduce fluid volume and pressure. **Warning:** Meclizine (antihistamine) is for **acute attack** symptom relief, not prophylaxis. Using it daily for prevention is ineffective and masks underlying disease progression.