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Amitriptyline

Amitriptyline

An old antidepressant now used mostly at low doses for nerve pain, migraine prevention and sleep.

Pain & Inflammation

Elavil, tricyclic antidepressant, TCA

Explained by a GMC-registered GP, not a leaflet

Honest about what we can and cannot prescribe remotely

Side effects given the same weight as benefits

Your NHS records in the room, with your consent

Clinically reviewed by Dr Mohammad Khan · Last reviewed

August 30, 2026

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Same-Day Appointments
Sick Notes
Private Prescriptions
Blood Tests
Menopause & HRT
Weight Management
Mental Health
Specialist Referrals

What it is

Amitriptyline is a tricyclic antidepressant, now used far more often at low doses for entirely different purposes.

It was developed in the 1950s and has largely been superseded as an antidepressant by SSRIs, which are safer in overdose and better tolerated. What kept it in use is that at doses a fraction of the antidepressant range it modulates how pain signals are processed in the spinal cord and brain.

Antidepressant doses are typically 75 to 150mg. Nerve pain and migraine prevention usually use 10 to 50mg — which is why finding "antidepressant" on the leaflet alarms people who were prescribed it for shingles pain.

What it is used for

  • Neuropathic pain — burning, shooting, electric-shock pain from nerve damage. Diabetic neuropathy, post-shingles pain, trigeminal neuralgia and sciatica
  • Migraine prevention, where it is a NICE-recommended option
  • Fibromyalgia and chronic widespread pain
  • Irritable bowel syndrome, at low dose
  • Sleep, where sedation is the useful part rather than the side effect
  • Depression, at higher doses — now uncommon as a first choice

Ordinary painkillers work poorly for nerve pain. That is not a failure of dose — the pain arises from the nerve itself rather than from tissue damage, and needs a drug that acts on nerve signalling.

How to take it

Take it in the evening, two to three hours before bed rather than at bedtime. Taking it too late is the commonest reason people feel drowsy the next morning and abandon it.

Starting

  • Usually 10mg at night, increased slowly every one to two weeks as needed and tolerated
  • Typical effective range for pain is 10 to 50mg
  • Give it four to six weeks at an adequate dose before judging it

What to expect early

Drowsiness and dry mouth are common in the first one to two weeks and usually settle. Knowing that in advance is what gets most people through to the point where it helps.

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Side effects

Common, especially early

  • Drowsiness and morning grogginess
  • Dry mouth — the most persistent complaint
  • Constipation, blurred vision
  • Weight gain
  • Dizziness on standing

Less common but important

  • Urinary retention, particularly in older men with prostate enlargement
  • Confusion in older people — it is on the list of medicines to use cautiously with age
  • Palpitations, and effects on heart rhythm at higher doses
  • Falls in older people, from dizziness and sedation combined

It is dangerous in overdose, considerably more so than SSRIs — relevant when there is any risk of self-harm.

Not suitable if

  • You have had a recent heart attack, or have a significant heart rhythm disturbance
  • You have severe liver disease
  • You have untreated narrow-angle glaucoma
  • You have urinary retention or significant prostate enlargement
  • You take, or recently took, a monoamine oxidase inhibitor
  • You have epilepsy — it can lower the seizure threshold, so caution applies

In older adults it is used cautiously and at lower doses, because confusion, falls and urinary retention are all more likely.

Interactions and monitoring

  • Other sedating medicines and alcohol — additive drowsiness
  • SSRIs and SNRIs — raised levels and serotonin syndrome risk
  • Tramadol — seizure and serotonin risk
  • Medicines that prolong the QT interval, including some antibiotics and antipsychotics
  • Other anticholinergic medicines — the burden adds up and drives confusion in older people

No routine blood monitoring is needed at low dose. An ECG is considered at higher doses or where there is cardiac history.

Can we prescribe this?

Yes, at low dose for nerve pain, migraine prevention or associated sleep difficulty, where the picture is clear and the cause has been established.

What we would want first is a diagnosis rather than a symptom. Nerve pain has a cause, and prescribing for it without knowing the cause is treating the alarm rather than the fire.

We do not initiate amitriptyline at antidepressant doses remotely. That is a different medicine at a different dose with different risks, and it warrants face-to-face assessment.

Cost and supply

Amitriptyline is a cheap generic, and low-dose treatment costs very little — often less than the England NHS prescription charge on a private prescription.

It comes as tablets and as an oral solution, which is useful for fine dose adjustment at the low end.

Stopping or switching

Do not stop abruptly

Stopping suddenly after regular use can cause headache, nausea, restlessness, sleep disturbance and vivid dreams. This is discontinuation, not addiction — but it is unpleasant and avoidable.

Reduce gradually over several weeks, more slowly if symptoms appear.

If it is not working

Give it four to six weeks at an adequate dose first. Most people who say it did not work stopped at 10mg after ten days.

Alternatives for nerve pain include duloxetine, and gabapentin or pregabalin — though we do not initiate gabapentinoids remotely, as they are controlled drugs with recognised misuse potential.

Nortriptyline is a related drug that is often less sedating and may suit people troubled mainly by drowsiness.

Common questions

Why have I been given an antidepressant for pain?

Because at low dose it changes how the nervous system processes pain signals, and that is a separate effect from its antidepressant action. A 10mg dose is nowhere near an antidepressant dose. It does not mean anyone thinks the pain is psychological.

Why am I so groggy in the morning?

Almost always because it is taken too late. Move it to two or three hours before bed. If that does not fix it, the dose is likely too high for you — lower doses often work just as well for pain.

How long before it works?

Two to six weeks at an adequate dose. Sleep often improves within days, which is encouraging but is not the pain effect.

Will it make me gain weight?

It can, and this is a genuine reason people stop. Worth raising rather than tolerating — alternatives exist.

Can I drink alcohol?

Alcohol adds to the drowsiness considerably. Small amounts are usually manageable once established, but not while the dose is being increased, and not before driving.

Is it addictive?

No. It causes discontinuation symptoms if stopped suddenly, but it is not habit-forming and there is no craving or dose escalation.

Dr Mohammad Zubair Khan, GMC-registered private GP and founder of Cheshire Clinics

Clinically reviewed by Dr Mohammad Zubair Khan, GMC 7563469

Last reviewed

August 30, 2026

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