Amitriptyline hydrochloride: Dosage, Side Effects, Brands & Clinical Use | MedexInfo
Labels:
Tricyclic Antidepressant (TCA)
Amitriptyline Hydrochloride
Rx Only
Therapeutic ClassTricyclic Antidepressant (TCA)
Common Dose25–150 mg/day orally in divided doses
Max / 24h150–200 mg/day (Adults)
PregnancyCategory C – Use if benefit outweighs risk
Indications ▼
Major depressive disorder
Chronic neuropathic pain
Fibromyalgia
Insomnia associated with depression
Migraine prophylaxis
Mechanism & Pharmacokinetics ▼
Mechanism: Inhibits reuptake of norepinephrine and serotonin in presynaptic neurons, enhancing mood. Also has anticholinergic and sedative effects.
Pharmacokinetics: Well absorbed orally; peak plasma 4–8 hrs. Metabolized in liver (CYP2D6). Half-life ~10–50 hrs. Excreted mainly via urine.
Dosage & Administration ▼
| Patient Category | Recommended Dose | Max / 24h |
|---|---|---|
| Adults (Depression) | 25 mg 1–3 times daily; titrate as needed | 150–200 mg/day |
| Neuropathic Pain | 10–25 mg at bedtime; titrate slowly | 150 mg/day |
| Children ≥12 yrs | 10–25 mg/day; adjust gradually | 50 mg/day |
Side Effects ▼
Common: Dry mouth, drowsiness, constipation, weight gain
Cardiovascular: Tachycardia, orthostatic hypotension
Rare: Arrhythmias, seizures, hepatotoxicity
Serious: Suicidal thoughts, serotonin syndrome (if combined with other serotonergic drugs)
Contraindications ▼
Hypersensitivity to TCAs
Recent myocardial infarction
Concurrent MAOI therapy (within 14 days)
Glaucoma, severe urinary retention (due to anticholinergic effects)
Drug Interactions ▼
MAO inhibitors: Risk of serotonin syndrome
SSRIs, SNRIs: Additive serotonergic and QT effects
Alcohol and CNS depressants: Enhanced sedation
Drugs causing QT prolongation: Risk of arrhythmias
Pregnancy & Lactation ▼
Category C – use if potential benefit justifies risk
Monitor neonate for withdrawal or respiratory effects if used late in pregnancy
Use caution during breastfeeding; small amounts excreted in milk
Patient Counseling Points ▼
Take at bedtime to minimize daytime drowsiness
Avoid alcohol and other sedatives
Do not stop abruptly; taper gradually
Report mood changes, suicidal thoughts, or palpitations
Maintain hydration to reduce anticholinergic side effects
Storage & Handling ▼
Store at 20–25°C, protect from light and moisture
Keep out of reach of children
Clinical / Research Summary ▼
Therapeutic Role: Amitriptyline hydrochloride is a tricyclic antidepressant used primarily for major depressive disorder, neuropathic pain, chronic tension-type headaches, and migraine prophylaxis.
Mechanism-Based Evidence: It inhibits the reuptake of norepinephrine and serotonin in the central nervous system, enhancing neurotransmitter availability and improving mood and pain modulation.
Clinical Effectiveness: Clinical trials demonstrate efficacy in reducing depressive symptoms, alleviating neuropathic pain, and preventing recurrent migraine episodes. Onset of effect is usually 2–4 weeks for mood symptoms, while analgesic effects may be observed earlier.
Safety Profile: Common side effects include dry mouth, sedation, constipation, and blurred vision. Cardiovascular effects such as orthostatic hypotension and arrhythmias can occur, particularly in overdose or elderly patients.
Research Directions: Ongoing studies are evaluating low-dose use for chronic pain syndromes, combination therapy with other antidepressants, and pharmacogenomic influences on response and tolerability.
Brand Names (Bangladesh & Global) ▼
Medical Disclaimer: This summary is for informational purposes only. Follow guidance from a qualified healthcare professional for dosage, interactions, and use.
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