Nortriptyline Milpharm (Nortriptyline)

Nortriptyline acts on multiple neurotransmitter pathways to manage mood and pain disorders.

• Major depressive disorder: alleviates depressive symptoms by improving mood, energy and sleep.
• Neuropathic pain: reduces pain intensity and improves functional capacity.
• Chronic tension‑type headache: decreases headache frequency and severity.
• Migraine prophylaxis: lowers the number of migraine attacks when used preventively.

• Nortriptyline inhibits the reuptake of norepinephrine and serotonin, increasing their synaptic concentrations. It also antagonizes muscarinic, histamine H1, and alpha‑adrenergic receptors, contributing to its analgesic, sedative, and anticholinergic effects. These combined actions modulate central pain pathways and mood regulation.

Nortriptyline may cause a range of adverse reactions, from mild to severe.

Common Side Effects

• Dry mouth: reduced salivation leading to throat discomfort.
• Constipation: slowed gastrointestinal motility.
• Drowsiness: increased sleepiness, especially after dose initiation.
• Blurred vision: temporary visual disturbances.
• Weight gain: modest increase in appetite and body weight.
• Orthostatic hypotension: dizziness upon standing.

Serious or Rare Side Effects

• Cardiac arrhythmia: irregular heart rhythm, potentially life‑threatening.
• Seizures: heightened risk, particularly at high plasma levels.
• Severe hypotension: sudden drop in blood pressure.
• Serotonin syndrome: agitation, hyperthermia, and neuromuscular abnormalities when combined with serotonergic agents.
• Agranulocytosis: rare drop in white blood cell count.

Before initiating therapy, clinicians should evaluate patient‑specific risk factors and monitor for adverse events.

• Dose titration: start low and increase gradually under physician supervision.
• Cardiovascular assessment: obtain baseline ECG in patients with cardiac history.
• Age considerations: use cautiously in elderly patients due to increased sensitivity.
• Drug interactions: review concomitant medications for serotonergic or CYP2D6‑inhibiting agents.
• Pregnancy: category C; weigh potential benefits against fetal risks.
• Store at ambient temperature below 25°C: keep in the original pack, protect from moisture.

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

Major Interactions (Avoid)

• MAO inhibitors: risk of hypertensive crisis.
• SSRIs or SNRIs: increased chance of serotonin syndrome.
• Strong CYP2D6 inhibitors (e.g., fluoxetine): elevated nortriptyline plasma concentrations.

Moderate Interactions (Monitor Closely)

• Anticholinergic drugs: additive dry mouth and constipation.
• Beta‑blockers: may enhance hypotensive effects.
• Diuretics: can increase orthostatic hypotension.