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Duloxetine is one of the most prescribed antidepressants and at the same time works against nerve pain — with an often underestimated discontinuation problem. About one in five adults develops a depression needing treatment over the course of their life. Anyone who simply stops duloxetine risks pronounced withdrawal symptoms such as dizziness and "electric shocks in the head" — slow tapering over weeks is a mandatory part of the therapy.
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Never stop duloxetine abruptly on your own — discontinuation symptoms are common. With suicidal thoughts, the Telefonseelsorge crisis helpline on 0800 1110111 (a free German service, around the clock); in an acute crisis, the emergency services (112; or 999/112 in the UK). Last updated: May 2026.
Duloxetine is a modern antidepressant with an unusual dual role as a pain medication. Below are the most important key facts for a quick orientation — the individual points are explained in detail in the following chapters.
| Property | Details |
|---|---|
| Active substance | Duloxetine |
| Trade names | Cymbalta, Ariclaim (stress incontinence), numerous duloxetine generics |
| ATC code | N06AX21 |
| Substance class | Serotonin-noradrenaline reuptake inhibitor (SNRI) |
| Mechanism of action | Inhibition of the reuptake of serotonin and noradrenaline → antidepressant and pain-relieving |
| Half-life | about 12 hours |
| Metabolism | Liver via CYP1A2 and CYP2D6 |
| Dosage form | Gastro-resistant hard capsules (30 mg, 60 mg) |
| Usual dosage | 30–60 mg/day, depending on the indication up to 120 mg/day |
| Onset of effect | Pain: 1–2 weeks; depression/anxiety: 2–6 weeks |
| Contraindications | Severe liver or kidney disease, MAO inhibitors, uncontrolled high blood pressure |
| Prescription status | Yes |
| Most important note | Never stop abruptly — always taper off step by step |
Duloxetine is a serotonin-noradrenaline reuptake inhibitor (SNRI) — a group of modern antidepressants that, compared to the SSRIs (such as sertraline), additionally act on the messenger substance noradrenaline. Duloxetine is known under the trade name Cymbalta. It has a remarkable dual role: it is used both with mental illnesses (depression, anxiety disorder) and with chronic pain — above all with nerve pain and fibromyalgia.
This versatility makes duloxetine an important medication for patients in whom depression and chronic pain occur together — a common combination, since both diseases reinforce each other. Duloxetine can address both problems at once here.
Like all modern antidepressants, duloxetine does not work acutely, but builds up its effect over weeks. And as with the SSRIs, discontinuation is an important topic: duloxetine must not be stopped abruptly, because otherwise distressing discontinuation symptoms can occur. We devote separate chapters to both aspects — the dual role and discontinuation.
Duloxetine inhibits the reuptake of serotonin and noradrenaline into the nerve cells. Thereby both messenger substances remain available longer in the synaptic cleft and can work more strongly. While SSRIs act only on serotonin, duloxetine as an SNRI addresses both systems — that explains both the antidepressant and the pain-relieving effect.
The pain-relieving effect rests on its own mechanism: serotonin and noradrenaline are central messenger substances of the body's own pain inhibition. In the spinal cord there are descending nerve pathways that dampen pain signals — these pathways use exactly serotonin and noradrenaline. Duloxetine strengthens this body's own pain inhibition, which is why it works with nerve pain and fibromyalgia, independently of its antidepressant effect.
Duloxetine is well absorbed after oral intake (as a gastro-resistant capsule, to protect the active substance from the stomach acid), reaches maximum levels after about 6 hours, and has a half-life of about 12 hours. The breakdown happens in the liver via CYP1A2 and CYP2D6 — from this arise important interactions. With severe liver function disorder, duloxetine is contraindicated.
The special thing about duloxetine is its effect in two completely different fields — a property that sets it apart from pure antidepressants:
With depression and generalised anxiety disorder, duloxetine works mood-lifting and anxiety-relieving through the raising of serotonin and noradrenaline. The additional noradrenaline effect can be advantageous especially in patients with pronounced lack of drive and exhaustion.
With neuropathic pain — above all diabetic polyneuropathy — duloxetine strengthens the body's own pain inhibition. It is one of the few medications that demonstrably work with this often hard-to-treat form of pain. The pain-relieving effect sets in independently of the mood.
With fibromyalgia — a chronic pain syndrome with widespread pain, exhaustion, and sleep disturbances — duloxetine is among the most effective drug options. It improves both the pain and the often accompanying depressive mood and exhaustion.
This dual role is clinically especially valuable, because chronic pain and depression frequently occur together and reinforce each other. Duloxetine can break this vicious circle at two places at once.
Duloxetine has an unusually broad palette of indications — both in the psychiatric and in the pain area:
| Indication | Effect / particular feature |
|---|---|
| Depression (major depression) | Mood-lifting; especially suitable with accompanying exhaustion and pain |
| Generalised anxiety disorder | Anxiety-relieving, through the effect on serotonin and noradrenaline |
| Diabetic polyneuropathy | Relief of nerve pain with diabetes — one of the main indications |
| Fibromyalgia | Chronic pain syndrome — improves pain, exhaustion, and the accompanying depressive mood |
| Chronic pain of the musculoskeletal system | e.g. chronic back pain, knee osteoarthritis (approved in some countries) |
| Stress incontinence | A special case — duloxetine strengthens the urethral sphincter via noradrenaline (its own approval at a lower dosage) |
The broad palette makes duloxetine a flexibly usable medication — the treating doctor sets the exact indication and dosage.
The dosage is governed by the indication. As with all antidepressants, a start is often made with a gradual increase, to reduce side effects (above all nausea):
| Indication | Dose | Note |
|---|---|---|
| Depression | 60 mg/day (often a start with 30 mg) | Maximum dose 120 mg/day |
| Generalised anxiety disorder | A start with 30 mg/day, then 60 mg/day | Gradual increase for better tolerability |
| Diabetic polyneuropathy | 60 mg/day, up to 120 mg/day if needed | Pain relief often already after 1–2 weeks |
| Fibromyalgia | A start with 30 mg, then 60 mg/day | Gradual increase because of side effects |
| Stress incontinence | 2× 40 mg daily | A lower dosage than with depression |
| Kidney impairment (eGFR < 30) | Contraindicated | — |
| Liver impairment | Contraindicated with relevant liver disease | — |
As with all antidepressants, patience is needed — duloxetine does not work immediately. The different effects set in at various times:
This latency of effect is important to understand: anyone who gives up in the first weeks because of side effects or an absent effect possibly misses an effective therapy. With the pain treatment, the effect is often noticeable earlier, which eases therapy adherence. With an absent effect after 6 to 8 weeks, the therapy is adjusted.
Duloxetine is well tolerated overall, but through the noradrenaline effect has a somewhat different side-effect profile than pure SSRIs:
| Frequency | Side effect |
|---|---|
| Very common | Nausea — above all at the start; mostly improves after 1–2 weeks |
| Common | Dry mouth |
| Common | Headaches, dizziness, tiredness or drowsiness |
| Common | Constipation (through noradrenaline) or more rarely diarrhoea |
| Common | Reduced appetite |
| Common | Sleep disturbances or increased tiredness |
| Common | Increased sweating — typical for SNRIs |
| Common | Sexual function disorders — see the separate chapter |
| Common | A slight blood pressure and pulse rise — through noradrenaline |
Most of these side effects are dose-dependent and improve over the course. The gradual increase of the dose helps to reduce the initial nausea.
Like all serotonergically acting antidepressants, duloxetine can cause sexual function disorders — a common but often concealed topic. These include loss of libido, erectile dysfunction, delayed or absent orgasm, reduced arousability.
What one can do: speak openly with the doctor — the symptoms are often only recognised on active enquiry. Options: wait (sometimes an improvement over the course), a dose reduction, a switch to an antidepressant with a lower sexual side-effect profile (e.g. mirtazapine, bupropion). Important: the depression itself can also impair sexuality — a careful distinction is sensible. More under sertraline, where this topic is treated in detail.
Besides the common, mostly well-manageable side effects, there are rare but serious complications whose warning signs patients should know:
A rare but potentially life-threatening complication with the combination with other serotonergically acting substances (other antidepressants, MAO inhibitors, triptans, tramadol, St John's wort). Symptoms: restlessness, confusion, sweating, racing heart, fever, trembling, muscle twitches. Call the emergency services immediately (112; or 999/112 in the UK) on suspicion.
Duloxetine can in rare cases damage the liver — above all with a pre-existing liver disease or simultaneous alcohol consumption. With severe liver disease, duloxetine is contraindicated. Warning signs: yellowing of the skin/eyes, dark urine, upper abdominal pain.
Through the noradrenaline effect, duloxetine can raise the blood pressure — with pre-existing high blood pressure, this should be monitored.
Like SSRIs, duloxetine can raise the bleeding tendency (caution with NSAIDs/anticoagulants), cause a hyponatraemia (sodium deficiency, above all in the elderly), and — above all at the start and in young patients — raise the risk of suicidal thoughts. Close support in the first weeks, above all in younger patients.
A central topic. Even though duloxetine is not addictive in the classic sense, an abrupt stopping can trigger a clear discontinuation syndrome — the short half-life makes duloxetine especially susceptible here.
