Mirtazapine Ethypharm (Mirtazapine)

Mirtazapine Ethypharm belongs to the NaSSA class and is employed in the management of depressive disorders.

• Major depressive disorder: reduces depressive symptoms and improves mood in adults.
• Depressive episodes associated with major depressive disorder: alleviates low mood, loss of interest and sleep disturbances.
• Treatment‑resistant depression (as adjunct): may enhance response when other antidepressants are insufficient.

• Mirtazapine acts as an antagonist at central presynaptic α2‑adrenergic receptors, which increases norepinephrine release, and blocks 5‑HT2 and 5‑HT3 serotonin receptors, enhancing serotonergic neurotransmission. It also antagonizes H1 histamine receptors, contributing to its sedative properties.

Mirtazapine may cause a range of adverse reactions that vary in frequency and severity.

Common Side Effects

• Sedation or drowsiness: feeling unusually sleepy, especially at treatment initiation.
• Increased appetite and weight gain: notable rise in hunger and body weight.
• Dry mouth: reduced salivation leading to oral discomfort.
• Constipation: infrequent bowel movements or hard stools.
• Dizziness: sensation of light‑headedness or unsteadiness.
• Fatigue: general feeling of tiredness.

Serious or Rare Side Effects

• Agranulocytosis: severe reduction in white blood cells, increasing infection risk.
• Stevens‑Johnson syndrome or toxic epidermal necrolysis: severe skin reactions with blistering.
• Suicidal thoughts or behavior: emergence or worsening of suicidal ideation.
• Severe hypotension: marked drop in blood pressure causing faintness.
• Seizures: rare occurrence of convulsive episodes.
• Hepatotoxicity: liver enzyme elevations indicating possible liver injury.

Before initiating therapy, clinicians should evaluate several safety considerations.

• Monitor weight: track changes due to appetite stimulation.
• Assess for suicidal ideation: especially during early treatment phases.
• Use caution in hepatic impairment: adjust therapy if liver function is compromised.
• Avoid abrupt discontinuation: taper gradually to reduce withdrawal symptoms.
• Evaluate for hypersensitivity: discontinue if allergic reactions occur.
• Store at room temperature: keep in the original packaging, protect from moisture and direct sunlight.

Mirtazapine can interact with other medicines, requiring careful management.

Major Interactions (Avoid)

• Monoamine oxidase inhibitors (MAOIs): risk of hypertensive crisis and serotonin syndrome.
• Central nervous system depressants (e.g., benzodiazepines, alcohol): additive sedation and respiratory depression.
• Potent CYP2D6 inhibitors (e.g., fluoxetine, paroxetine): may increase mirtazapine plasma levels.

Moderate Interactions (Monitor Closely)

• Other serotonergic agents (e.g., SSRIs, tramadol): monitor for serotonin syndrome.
• Antihypertensive drugs: possible additive blood‑pressure lowering effect.
• Anticholinergic medications: may exacerbate dry mouth and constipation.