Meniserc (Betahistine Dihydrochloride)

• Meniserc (betahistine) is used in the management of vestibular disorders, particularly conditions affecting inner‑ear fluid balance.
• Meniere's disease: helps decrease the frequency and intensity of vertiginous episodes and associated tinnitus by improving endolymphatic drainage.
• Vertigo of other origins: alleviates dizziness and nausea by enhancing vestibular blood flow and stabilizing inner‑ear pressure.
• Balance disorders: supports steadier posture and reduces disequilibrium symptoms, contributing to improved gait stability.

• Betahistine acts as a histamine H1‑receptor antagonist while simultaneously stimulating H3 receptors. This dual activity leads to vasodilation of the inner‑ear microvasculature, increasing vestibular blood flow and promoting drainage of endolymph, thereby lowering endolymphatic pressure and improving vestibular function. It does not significantly cross the blood‑brain barrier, limiting central effects, and its antihistaminic action may reduce histamine‑mediated vascular permeability in the labyrinth.

Betahistine may be associated with several adverse reactions, most of which are mild and transient.

Common Side Effects

• Headache: mild to moderate intensity, often transient.
• Nausea: occasional stomach upset after dosing.
• Gastrointestinal discomfort: mild abdominal pain or dyspepsia.
• Flushing: brief warmth or redness of the skin.
• Dizziness: may occur initially as the vestibular system adjusts.

Serious or Rare Side Effects

• Arrhythmia: irregular heart rhythm requiring medical attention.
• Severe hypotension: marked drop in blood pressure leading to fainting.
• Allergic reactions: rash, itching, swelling, or anaphylaxis.
• Thrombocytopenia: unusually low platelet count observed in rare cases.

• Betahistine should be used with caution in specific populations and conditions.
• Pregnancy: safety not established; use only if potential benefit justifies the risk.
• Breastfeeding: unknown excretion; consider potential effects on the infant.
• Renal impairment: dose adjustment may be required due to reduced clearance.
• Elderly: monitor for dizziness and hypotension as sensitivity may increase.
• Concomitant antihistamines: may diminish therapeutic efficacy of betahistine.
• Store at room temperature: keep in the original packaging, protect from moisture and light.

Betahistine can interact with other medicines, affecting its efficacy or safety.

Major Interactions (Avoid)

• MAO inhibitors: combined use may increase risk of hypertensive events.
• Strong vasodilators: additive hypotensive effect could lead to symptomatic low blood pressure.

Moderate Interactions (Monitor Closely)

• Cimetidine: may increase betahistine plasma concentrations.
• Alcohol: can enhance dizziness and sedation.
• Other antihistamines: may reduce the vestibular benefits of betahistine.
• Diuretics: concurrent use may alter inner‑ear fluid balance, requiring monitoring.