Nortriptyline Accord-Uk (Nortriptyline)

• Nortriptyline is a tricyclic antidepressant that acts on mood and pain pathways, and is indicated for the following conditions:
• Major depressive disorder: alleviates depressive symptoms, improves mood, sleep and concentration in adult patients.
• Neuropathic pain: reduces pain intensity and abnormal sensations caused by peripheral nerve damage, aiding functional recovery.
• Chronic tension‑type headache: decreases frequency, duration and severity of tension‑type headache episodes, contributing to better daily functioning.

• Nortriptyline inhibits the reuptake of the neurotransmitters norepinephrine and serotonin at presynaptic neuronal terminals, increasing their concentrations in the synaptic cleft. The elevated norepinephrine enhances descending inhibitory pain pathways, while increased serotonin modulates mood and pain perception. By blocking sodium channels, the drug also stabilizes neuronal membranes, contributing to its analgesic properties. These combined actions underlie its antidepressant and neuropathic pain‑relieving effects.

Nortriptyline may cause a range of adverse reactions, which are generally classified by frequency and severity.

Common Side Effects

• Dry mouth: reduced salivation leading to thirst.
• Constipation: slowed gastrointestinal motility.
• Drowsiness: increased sedation, especially at treatment initiation.
• Weight gain: gradual increase in body weight.

Serious or Rare Side Effects

• Cardiac arrhythmia: irregular heart rhythm, potentially life‑threatening.
• Seizures: risk of convulsive episodes, particularly in predisposed individuals.
• Severe hypotension: marked drop in blood pressure causing dizziness or fainting.

When prescribing nortriptyline, clinicians should consider several precautionary measures to minimise risks.

• Cardiac assessment: obtain baseline ECG in patients with known heart disease.
• Dose titration: start with low dose and increase gradually under medical supervision.
• Concomitant CNS depressants: avoid or monitor use with alcohol, benzodiazepines or opioids.
• Elderly patients: use reduced doses and monitor for confusion or falls.
• Pregnancy and lactation: evaluate risk‑benefit; use only if clearly needed.
• Store at ambient temperature: keep below 25 °C in the original container, protect from moisture and light.

Nortriptyline can interact with other medicines, altering its efficacy or safety profile.

Major Interactions (Avoid)

• MAO inhibitors: concurrent use may cause hypertensive crisis or serotonin syndrome.
• SSRIs or SNRIs: combined therapy increases risk of serotonin syndrome.
• Anticholinergic drugs: additive anticholinergic burden may exacerbate dry mouth, constipation, urinary retention.

Moderate Interactions (Monitor Closely)

• CYP2D6 inhibitors (e.g., fluoxetine, quinidine): may raise nortriptyline plasma levels, requiring dose adjustment.
• Antihypertensives: nortriptyline may enhance hypotensive effects.
• Diuretics: increased risk of electrolyte imbalance and orthostatic hypotension.