Mianserin Neuraxpharm (Mianserin Hydrochloride)

Mianserin is indicated for depressive disorders and works by modulating neurotransmitter activity.

• Major depressive disorder: reduces depressive symptoms and improves mood in adults.
• Depressive episodes associated with bipolar disorder: may be used as an adjunct to stabilize mood when indicated by a specialist.
• Treatment‑resistant depression: considered when first‑line agents are ineffective, under specialist supervision.

• Mianserin acts primarily as an antagonist of central presynaptic α2‑adrenergic receptors, which increases noradrenaline release. It also blocks histamine H1, serotonin 5‑HT2, and muscarinic receptors, leading to enhanced serotonergic and noradrenergic neurotransmission that underlies its antidepressant effect.

Mianserin may cause a range of adverse reactions, most of which are dose‑related and reversible upon discontinuation.

Common Side Effects

• Drowsiness: feeling unusually sleepy or fatigued.
• Weight gain: increase in body weight over time.
• Dry mouth: reduced salivation causing discomfort.
• Constipation: infrequent or difficult bowel movements.
• Orthostatic hypotension: dizziness upon standing.
• Increased appetite: heightened desire for food.

Serious or Rare Side Effects

• Agranulocytosis: severe reduction in white blood cells.
• Seizures: risk of convulsive episodes.
• Cardiac arrhythmias: irregular heart rhythms.
• Severe hypotension: marked drop in blood pressure.
• Hepatotoxicity: liver injury indicated by abnormal enzymes.
• Neuroleptic malignant‑like syndrome: rare, life‑threatening reaction.

Before initiating therapy, clinicians should evaluate patient history and monitor for specific risks.

• Cardiovascular assessment: check for pre‑existing heart disease or arrhythmias.
• Liver function: perform baseline hepatic tests and monitor periodically.
• Renal function: assess kidney health, especially in elderly patients.
• Concomitant CNS depressants: avoid or use with caution due to additive sedation.
• Pregnancy and lactation: prescribe only if benefits outweigh potential risks.
• Store at room temperature: keep below 25 °C, in the original container, protected from moisture and light.

Mianserin can interact with several drug classes, requiring careful management.

Major Interactions (Avoid)

• MAO inhibitors: risk of hypertensive crisis or serotonin syndrome.
• CNS depressants (e.g., benzodiazepines, alcohol): may cause profound sedation.
• Anticholinergic agents: increase risk of severe dry mouth and constipation.

Moderate Interactions (Monitor Closely)

• SSRIs or SNRIs: potential for additive serotonergic effects.
• Antihypertensives: may enhance orthostatic hypotension.
• CYP2D6 substrates: mianserin may alter metabolism of drugs processed by this enzyme.