Nortriptyline Focus Pharmaceuticals Limited (Nortriptyline Hydrochloride)

Nortriptyline is a tricyclic antidepressant used in several psychiatric and pain‑related conditions.

• Major depressive disorder: reduces depressive symptoms and improves mood in adults.
• Depressive episodes associated with bipolar disorder: alleviates depressive phases while mood stabilizers manage mania.
• Chronic neuropathic pain: diminishes pain intensity and improves functional capacity.
• Migraine prophylaxis: decreases frequency and severity of migraine attacks.

• Nortriptyline inhibits the reuptake of norepinephrine and serotonin, increasing their synaptic concentrations. It also antagonizes muscarinic, histamine, and alpha‑adrenergic receptors, contributing to its analgesic and mood‑stabilising effects while producing characteristic anticholinergic and antihistaminic actions.

Adverse reactions may vary in frequency and severity.

Common Side Effects

• Dry mouth: reduced salivary flow causing discomfort.
• Constipation: slowed gastrointestinal motility.
• Drowsiness or sedation: increased central nervous system depression.
• Weight gain: increased appetite or metabolic changes.
• Blurred vision: ocular accommodation disturbances.
• Urinary retention: difficulty initiating or maintaining urine flow.

Serious or Rare Side Effects

• Cardiac arrhythmia: irregular heart rhythm, especially in patients with pre‑existing heart disease.
• Seizures: heightened risk in susceptible individuals.
• Severe hypotension: sudden drop in blood pressure causing dizziness.
• Agranulocytosis: marked reduction in white blood cells.
• Hepatic toxicity: abnormal liver function tests or hepatitis.
• Suicidal thoughts: emergence or worsening of suicidal ideation.

Before initiating therapy, clinicians should evaluate several safety factors.

• Cardiac assessment: review history of heart disease and obtain ECG if indicated.
• Blood pressure monitoring: check for orthostatic changes, especially in the elderly.
• Discontinuation strategy: taper gradually to avoid withdrawal symptoms.
• Elderly caution: start with lower doses due to increased sensitivity to anticholinergic effects.
• MAO‑inhibitor avoidance: ensure a minimum 14‑day washout period before co‑administration.
• Store at ambient temperature: keep in the original container, protect from moisture and direct sunlight.

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

Major Interactions (Avoid)

• Monoamine oxidase inhibitors: risk of hypertensive crisis and serotonin syndrome.
• Selective serotonin reuptake inhibitors or other tricyclics: additive serotonergic and anticholinergic effects.
• CYP2D6 strong inhibitors (e.g., fluoxetine, paroxetine): may increase nortriptyline plasma levels.

Moderate Interactions (Monitor Closely)

• Antihistamines or anticholinergics: enhanced dry mouth, constipation, and urinary retention.
• CNS depressants or alcohol: increased sedation and impaired psychomotor performance.