Content reviewed by the PillRelax Healthcare Team | Last reviewed: September 2026

Amitriptyline is one of the most versatile prescription medicines in the UK. Originally developed as an antidepressant, it is now prescribed far more commonly for pain, sleep, and other conditions at lower doses.

What Is Amitriptyline?

Amitriptyline is a tricyclic antidepressant (TCA) that inhibits the reuptake of serotonin and noradrenaline. It also has significant antihistaminic and anticholinergic properties.

Uses at Low Doses (10-50mg)

Neuropathic pain – diabetic neuropathy, post-herpetic neuralgia, fibromyalgia
Insomnia – particularly chronic pain-related sleep disruption
Chronic tension headache and migraine prevention
Irritable Bowel Syndrome (IBS)

Amitriptyline for Sleep

At doses of 10-25mg, Amitriptyline has sedating properties through histamine H1 receptor blockade. It is commonly prescribed by UK GPs for chronic insomnia, particularly where pain is a contributing factor. It does not carry the dependence risk of benzodiazepines or Z-drugs.

Common Side Effects

Dry mouth (very common)
Daytime drowsiness
Constipation
Blurred vision
Weight gain with prolonged use

Frequently Asked Questions

Is Amitriptyline addictive?

Amitriptyline is not considered addictive like benzodiazepines or opioids. However, abrupt discontinuation after prolonged use can cause discontinuation symptoms. Dose reduction should be gradual.