A once-daily hard gastro-resistant capsule containing 30mg duloxetine as hydrochloride
SNRI class — acts on both serotonin and noradrenaline (distinct from SSRIs which act on serotonin alone)
30mg is the standard adult starting dose for generalised anxiety disorder (GAD), and a gentler starting option for depression (60mg is the standard depression dose)
Also licensed for diabetic peripheral neuropathic pain in adults (60mg standard dose)
Prescription only, dispensed by Courier Pharmacy following full clinical consultation with a UK-qualified prescriber and blood pressure review
Duloxetine 30mg is a hard gastro-resistant (enteric-coated) capsule. It contains duloxetine hydrochloride equivalent to 30 milligrams of duloxetine. Firstly, duloxetine belongs to a family of medicines called serotonin-noradrenaline reuptake inhibitors (SNRIs). This is a class distinct from the more commonly-prescribed selective serotonin reuptake inhibitors (SSRIs) such as sertraline, citalopram, escitalopram, and duloxetine.
Additionally, duloxetine was originally developed by Eli Lilly under the brand name Cymbalta, first licensed in the UK in the mid-2000s. However, since the patent expired, generic duloxetine is now widely available from multiple UK-approved manufacturers including Aurobindo, Zentiva, Viatris (formerly Mylan), and others.
Furthermore, generic and branded versions contain the same active ingredient at the same clinical standard, though excipients and capsule appearance vary slightly between manufacturers. As a result, prescribers typically select based on availability and cost rather than clinical differences between brands.
How SNRIs work
Depression, anxiety, and chronic neuropathic pain all involve changes in several brain and nerve chemicals, including serotonin and noradrenaline. In particular, both are chemical messengers that help regulate mood, arousal, pain signalling, and other functions.
SNRIs like duloxetine increase both serotonin and noradrenaline activity by blocking their reabsorption into nerve cells. This dual mechanism is what distinguishes SNRIs from SSRIs (which act on serotonin alone).
The extra noradrenergic action contributes both to the antidepressant/anxiolytic effect and to duloxetine’s ability to reduce nerve pain in diabetic neuropathy.
Furthermore, this dual action also underlies some of duloxetine’s side-effect profile. This inlcudes the potential for raised blood pressure (a noradrenergic effect) and greater discontinuation symptoms than most SSRIs. As a result, over several weeks, brain circuits involved in mood, anxiety, and pain gradually adjust. Notably, this is why duloxetine takes time to work rather than acting instantly.
A treatment that needs regular review
Duloxetine is not a self-service medicine. Firstly, starting an antidepressant or SNRI is a clinical decision that needs proper assessment. This includes blood pressure and a review of medical history (liver, kidney, cardiac).
Ongoing review matters throughout treatment, especially in the first few weeks, when the dose changes, and periodically thereafter to check blood pressure.
However, patients under 25 need closer monitoring, particularly early in treatment. Stopping duloxetine needs to be planned carefully because SNRI discontinuation symptoms can be more pronounced than SSRI discontinuation. At Courier Pharmacy, duloxetine is always dispensed through a full prescriber-led consultation with clear plans for review.
Key features and specifications
Active ingredient: duloxetine hydrochloride
Form: hard gastro-resistant (enteric-coated) capsule
Pack sizes: commonly 28 capsules (one month)
Manufacturers: Cymbalta (Eli Lilly originator); generic duloxetine no available
An SNRI antidepressant, licensed for depression, GAD, and diabetic neuropathic pain
Duloxetine 30mg is a hard gastro-resistant capsule licensed in the UK for major depressive disorder, generalised anxiety disorder (GAD), and diabetic peripheral neuropathic pain in adults. Firstly, duloxetine belongs to a family of medicines called serotonin-noradrenaline reuptake inhibitors (SNRIs) — it works on two brain chemical messengers (serotonin and noradrenaline) rather than just one, which distinguishes it from the SSRI class (sertraline, citalopram, escitalopram, duloxetine).
Additionally, 30mg once daily is the standard starting dose for GAD, and can also be used as a gentler starting or maintenance dose for depression (though 60mg is the standard depression dose). However, duloxetine is generally not the first-choice SSRI-alternative unless there’s a specific reason (co-existing pain, previous SSRI failure, prescriber judgement), because SNRIs carry a somewhat different side-effect profile including nausea in the first weeks, blood pressure elevation, and generally more pronounced discontinuation symptoms than SSRIs.
At Courier Pharmacy, duloxetine is prescribed through a full clinical consultation with a UK-qualified prescriber, with ongoing review throughout treatment.
If you need urgent help now
If you’re in immediate danger, or you feel you might harm yourself or someone else, please seek help right now. However, the information below is for general education about duloxetine. It isn’t a substitute for talking to someone.
Samaritans: call 116 123 (free, 24 hours a day, 365 days a year)
SHOUT: text SHOUT to 85258 for free crisis text support in the UK
NHS 111: call 111 and choose the mental health option
For immediate danger to life: call 999 or go to your nearest A&E
Five key takeaways
Duloxetine 30mg is a once-daily hard gastro-resistant capsule; it belongs to the SNRI (serotonin-noradrenaline reuptake inhibitor) class, distinct from SSRIs.
Licensed in the UK for adult major depressive disorder, generalised anxiety disorder (GAD), and diabetic peripheral neuropathic pain.
30mg is the standard starting dose for GAD; the standard target dose is 60mg (up to a maximum of 120mg daily) in all three indications.
Requires blood pressure monitoring, is not for chronic liver disease or severe renal impairment (CrCl below 30), and is contraindicated with the CYP1A2 inhibitors fluvoxamine and ciprofloxacin.
Duloxetine 30mg is a Prescription Only Medicine. A UK-qualified prescriber reviews every request at courierpharmacy.co.uk.
What is Duloxetine 30mg: overview
Where duloxetine fits in the NICE depression pathway
NICE NG222 (published in 2022) covers depression in adults. In particular, it recommends a range of first-line options for less severe depression including guided self-help, group CBT, individual CBT, or an SSRI (sertraline is commonly the SSRI of first choice). Additionally, for more severe depression, combined therapy (antidepressant plus talking therapy) is recommended. However, SNRIs like duloxetine and venlafaxine are typically considered as second-line options after an inadequate response to an SSRI, or as a first-line option where there’s a specific reason (co-existing chronic neuropathic pain, previous SNRI response, prescriber judgement). Furthermore, for GAD, NICE NG113 (generalised anxiety disorder and panic disorder) also positions duloxetine as an SSRI-alternative rather than a first-line default. As a result, duloxetine’s clinical position in UK practice is well-established as a second-step or specific-indication option rather than a universal first choice.
Duloxetine vs SSRIs and other SNRIs
The SSRI class (sertraline, citalopram, escitalopram, fluoxetine, paroxetine) and the SNRI class (duloxetine, venlafaxine) share the same broad indications for depression and anxiety, but differ in mechanism and side-effect profile. In particular, SSRIs act on serotonin alone, whereas SNRIs also act on noradrenaline. Additionally, this extra noradrenergic action gives SNRIs some ability to relieve chronic neuropathic pain (which SSRIs don’t share), and duloxetine is specifically UK-licensed for diabetic peripheral neuropathic pain. However, SNRIs typically carry more side effects than SSRIs, particularly early nausea (very common with duloxetine in the first 1 to 2 weeks), potential rise in blood pressure, and often more pronounced discontinuation symptoms. Furthermore, within the SNRI class, duloxetine and venlafaxine differ mainly in pharmacokinetics and drug-interaction profile (duloxetine is metabolised primarily by CYP1A2, so is contraindicated with strong CYP1A2 inhibitors like fluvoxamine or ciprofloxacin). As a result, prescribers pick between SSRIs and SNRIs (and between duloxetine and venlafaxine) based on medical history, previous treatment response, other medicines, and specific indications like chronic neuropathic pain.
A course of weeks or months, not a quick fix
Antidepressant treatment for depression is typically continued for at least 6 to 9 months after symptoms improve. Firstly, this reduces the risk of relapse. Additionally, some patients need longer-term treatment, especially those who have had multiple episodes of depression. However, the decision on how long to continue is made with your prescriber based on your circumstances. Above all, duloxetine is not a short course like a two-week antibiotic; it’s a longer-term commitment to feeling better.
Talking therapy alongside medication
NICE recommends that antidepressants work best alongside talking therapy for most people with depression. In particular, cognitive behavioural therapy (CBT), interpersonal therapy, or behavioural activation are commonly offered. However, these can be accessed via NHS Talking Therapies (self-referral in England) or through private providers. Additionally, some patients find lifestyle changes (exercise, sleep hygiene, social connection) important alongside treatment. Furthermore, where duloxetine is prescribed for diabetic neuropathic pain, treatment usually works alongside diabetes management (glycaemic control, foot care, and management of other diabetic complications) rather than as a standalone treatment. As a result, duloxetine is one part of a wider approach rather than the only thing that helps.
Why choose Courier Pharmacy for your Duloxetine 30mg
Registered, independent, and patient-led
Courier Pharmacy is a UK-registered independent pharmacy. The General Pharmaceutical Council regulates us. Firstly, depression looks different for every patient. Additionally, your symptom pattern, other health conditions, other medicines, and previous treatment history all matter. As a result, our prescribers ask about those things properly rather than treating antidepressant prescribing as a tick-box exercise. Getting your mental health treatment right is about the fit and the follow-up.
Dr Ada Jex-Cori, our brand pharmacist
Our brand pharmacist is Dr Ada Jex-Cori. She represents the spirit of what we do. Named for Ada Lovelace, Sophia Jex-Blake, and Gerty Cori, she stands for evidence-led, unafraid-of-questions medicine. Her message is straightforward. You’re not broken. The system is. We’re here to change that.
Care that keeps showing up
Antidepressant treatment isn’t a one-off transaction. Furthermore, we build in ongoing review from the start. Additionally, if side effects appear in the first few weeks, we’re here to help you decide whether they’re likely to settle or whether the treatment needs adjusting. However, when the time comes to reduce the dose or stop, we help plan the tapering safely. For patients navigating depression alongside other health concerns, hormonal changes, or a difficult life stage, that continuity matters.
Free fortnightly Sunday drop-in clinics in Derby
Healthcare shouldn’t only happen when you’re paying for it. Every fortnight, we run free drop-in talks at Insomnia Coffee Shop on Burton Road, Derby, on Sunday from 10am to 12 noon. Anyone can come. No appointment. No cost. No pressure. We cover mental health, hormones, skincare, hair loss, and more.
Buy Duloxetine 30mg Capsules (Prescription Only) from Courier Pharmacy
Duloxetine 30mg is a Prescription Only Medicine. You can request it at courierpharmacy.co.uk. Firstly, complete a full online consultation covering your history, current symptoms, other medicines, and blood pressure. Then, a UK-qualified prescriber reviews your answers carefully. If duloxetine is appropriate for you, we dispense and deliver discreetly with a clear follow-up plan.
Complete a full online consultation covering symptoms, history, and other medicines
A UK prescriber reviews your consultation and may follow up with questions
If approved, a prescription is issued and dispensed
We deliver discreetly and set up your review schedule
If duloxetine isn’t the right treatment for you, we’ll explain why and suggest better routes. Sometimes GP referral, talking therapy, an SSRI first-line, or a different medicine altogether is the right next step. Above all, we won’t dispense duloxetine just because it was requested.
Summary
A once-daily SNRI antidepressant/anxiolytic licensed for adult major depression, generalised anxiety disorder, and diabetic peripheral neuropathic pain.
30mg is the standard adult starting dose for GAD; 60mg is the standard target for depression and diabetic neuropathic pain; maximum 120mg daily across all indications.
Sits within the SNRI class alongside venlafaxine (both work on serotonin and noradrenaline).
Recommended by NICE as a first-line antidepressant option in NG222 (depression in adults) alongside talking therapy.
Uniquely licensed among antidepressants for diabetic peripheral neuropathic pain (a chronic nerve-pain condition).
Requires blood pressure monitoring; contraindicated in chronic liver disease, severe renal impairment (CrCl <30), and with strong CYP1A2 inhibitors (fluvoxamine, ciprofloxacin, enoxacin).
Active ingredient in Duloxetine 30mg
Duloxetine hydrochloride
The active ingredient is duloxetine, provided as duloxetine hydrochloride. In particular, each Duloxetine 30mg capsule delivers 30 milligrams of duloxetine. However, duloxetine is a naphthalene-derivative SNRI that inhibits both serotonin and noradrenaline reuptake. Additionally, duloxetine has an elimination half-life of about 8 to 17 hours (typically around 12 hours), which supports once-daily dosing but is relatively short compared to fluoxetine's several-day half-life. Furthermore, it's metabolised in the liver mainly by CYP1A2, with contribution from CYP2D6. As a result, duloxetine is a moderate inhibitor of CYP2D6 (raising levels of some other medicines) and is contraindicated with strong CYP1A2 inhibitors including fluvoxamine and ciprofloxacin, which dramatically raise duloxetine levels.
Gastro-resistant capsule composition
Duloxetine capsules contain enteric-coated pellets designed to release the active in the small intestine rather than the stomach. In particular, this is because duloxetine is acid-labile — it's chemically unstable in stomach acid and would be broken down before absorption if released too early. Additionally, this is why duloxetine capsules must always be swallowed whole rather than opened, crushed, or chewed — doing so disrupts the enteric coating and reduces both effectiveness and tolerability. Furthermore, capsule excipients vary between manufacturers but typically include sucrose (up to about 56mg per capsule) as part of the sugar spheres, hypromellose, mannitol, talc, macrogol, and the enteric-coating polymer methacrylic acid-ethyl acrylate copolymer. However, patients with rare hereditary fructose intolerance, glucose-galactose malabsorption, or sucrase-isomaltase insufficiency should not take duloxetine because of the sucrose content.
What is Duloxetine 30mg for?
Depression (major depressive episodes)
Duloxetine is licensed for the treatment of major depressive episodes and for prevention of recurrence of depression. In particular, this covers moderate to severe depression that meets diagnostic criteria. However, mild depression is often managed initially with self-help, exercise, and talking therapy rather than medication. Additionally, decisions about starting an antidepressant are based on the severity, duration, and impact of symptoms alongside patient preference.
Other licensed uses
Beyond adult depression, duloxetine is licensed in the UK for two other adult indications. Firstly, generalised anxiety disorder (GAD) in adults — 30mg is the standard starting dose here, typically titrated to 60mg (up to a maximum of 120mg daily). Additionally, diabetic peripheral neuropathic pain in adults — a chronic pain condition where damaged nerves cause burning, stabbing, shooting, or aching pain (often described as electric-shock or pins-and-needles sensations) in the feet and lower legs; the standard dose for this indication is 60mg once daily. However, unlike some other antidepressants, duloxetine is not licensed in the UK for depression in children or adolescents under 18, and is not licensed for OCD, panic disorder, bulimia nervosa, or PTSD. Furthermore, duloxetine at higher doses (40mg twice daily = 80mg/day) is separately marketed under the brand Yentreve for moderate-to-severe stress urinary incontinence in women, though this is a distinct product and licensing arrangement. As a result, duloxetine's licensed range in the UK is narrower than some SSRIs but includes the unique diabetic neuropathic pain indication.
What duloxetine won't fix
Above all, duloxetine is a medicine for specific mental health conditions, not a general mood enhancer. In particular, it isn't licensed for grief, life dissatisfaction, low self-esteem, or ordinary stress. Additionally, it won't fix underlying life circumstances that are contributing to low mood. However, it works best when combined with talking therapy and lifestyle support. Furthermore, some patients don't respond to duloxetine and need a different antidepressant or approach. As a result, duloxetine is one tool among several, not a universal solution.
How does Duloxetine 30mg work?
Selective serotonin reuptake inhibition
Nerve cells communicate using chemical messengers called neurotransmitters. Firstly, serotonin is one of these, and it plays a role in mood, sleep, appetite, and other functions. Additionally, after nerve cells release serotonin, they normally reabsorb it via a transporter protein. However, duloxetine blocks this reabsorption selectively, meaning serotonin stays in the space between nerve cells for longer. Furthermore, this increased signalling gradually influences the brain circuits involved in mood regulation. As a result, mood, sleep, and other functions can gradually improve over weeks.
Why it takes weeks to work
Increased serotonin signalling happens quickly after starting duloxetine. However, the clinical benefit builds slowly. In particular, this is because the effect depends on gradual changes in brain circuitry, receptor sensitivity, and downstream gene expression. However, these adaptations take weeks to develop. Additionally, this is why duloxetine is not a quick-acting medicine and why consistent daily dosing over several weeks matters. Above all, don't judge whether duloxetine is working in the first two weeks.
How to take Duloxetine 30mg
When and how
Take one Duloxetine 30mg capsule once daily. In particular, swallow the capsule whole with water; do not open, crush, or chew it (the enteric coating protects the active ingredient from stomach acid and is essential for effective absorption). Additionally, take at roughly the same time each day; consistency matters more than the specific time. However, morning dosing usually works reasonably well because duloxetine can occasionally cause insomnia if taken close to bedtime. Furthermore, if higher daily doses (60mg or above) are prescribed, they may be taken as a single dose or as a divided dose across the day. As a result, work with your prescriber to find the timing that suits your response.
With or without food
Duloxetine can be taken with or without food. Additionally, taking with food may reduce mild gastrointestinal side effects like nausea in the first few weeks (nausea is the most common early side effect and usually settles within 1 to 2 weeks). However, always swallow the capsule whole; never open, crush, or chew it. The enteric coating protects duloxetine from stomach acid — duloxetine is acid-labile and would be broken down before absorption if the capsule contents were exposed to the stomach. As a result, capsule integrity is essential for effective treatment; if you have swallowing difficulties, discuss alternatives with your prescriber.
Alcohol
Alcohol is not recommended during duloxetine treatment. In particular, alcohol can worsen depression symptoms directly and undermine treatment. Additionally, it can increase sedation and reduce the clarity of thought needed for early recovery. However, occasional light drinking is unlikely to be dangerous but is generally advised against. As a result, discuss alcohol use with your prescriber during consultation.
Treatment dosage Duloxetine 30mg
Adult dose across the three indications
For generalised anxiety disorder (GAD), 30mg once daily is the standard starting dose in adults. In particular, this can be titrated up to 60mg (the usual target dose for most patients), 90mg, or a maximum of 120mg daily based on response. However, for major depressive disorder the standard starting and target dose is 60mg once daily, though 30mg is sometimes used as a gentler starting dose in patients who are sensitive to SSRIs or who need slower titration; the maximum for depression is also 120mg daily. Additionally, for diabetic peripheral neuropathic pain, the starting and maintenance dose is 60mg once daily (30mg is not the standard dose for this indication). Furthermore, response to treatment should be reviewed at around 2 months; further response beyond that is unlikely if there's been no benefit. Above all, dose changes should be made by your prescriber. The BNF and Duloxetine 30mg gastro-resistant capsules: Summary of Product Characteristics confirm these directions.
How long until it works
Duloxetine is not a quick-acting medicine. Firstly, some improvement in mood, anxiety, sleep, or pain may appear within 1 to 2 weeks. Additionally, most patients notice more meaningful benefit at 2 to 4 weeks. However, full effect for depression and anxiety usually takes 4 to 6 weeks; for diabetic neuropathic pain, up to 2 months may be needed to judge response. Above all, don't stop taking duloxetine in the first few weeks just because you don't feel different (early side effects like nausea often improve as the medicine takes effect). As a result, patience and consistent daily dosing give the medicine the best chance of working.
Stopping duloxetine (gradual taper is essential)
Above all, do not stop duloxetine suddenly. In particular, duloxetine has a relatively short half-life (about 12 hours) compared to some other antidepressants, and abrupt stopping often causes noticeable discontinuation symptoms including dizziness, sensory disturbances (electric-shock or 'zapping' sensations), sleep problems, agitation, nausea, headache, and mood changes. However, planned gradual tapering over at least 2 weeks (often longer, particularly at higher doses or after long-term treatment) reduces this risk substantially. Additionally, in some patients the dose is stepped down to alternate-day 30mg before stopping altogether. Furthermore, if you notice intolerable symptoms after a dose reduction, contact your prescriber; sometimes stepping the dose back up and tapering more slowly is needed. As a result, tapering off duloxetine needs prescriber guidance and time.
Missed doses
If you forget a dose, take it as soon as you remember unless it's nearly time for the next dose. However, don't take two doses to catch up. Additionally, because of duloxetine's relatively short half-life, missing doses is more impactful than with longer-acting antidepressants; consistency matters. As a result, if you're frequently missing doses, talk to your prescriber about strategies to make the routine easier.
Warnings and precautions for Duloxetine 30mg
Hepatotoxicity risk (contraindicated in chronic liver disease)
Duloxetine is contraindicated in patients with hepatic disease resulting in hepatic impairment, and should not be used in patients with substantial alcohol consumption or chronic liver disease. In particular, cases of hepatitis, hepatic failure (some fatal), and cholestatic jaundice have been reported with duloxetine, mostly in patients with pre-existing liver disease or heavy alcohol use. However, if you notice signs of liver problems during treatment (jaundice/yellowing of skin or eyes, dark urine, pale stools, itching, right upper abdominal pain, unexplained tiredness), stop duloxetine and seek prompt medical assessment. Additionally, disclose any liver disease, hepatitis history, or regular alcohol use during consultation so this can be properly assessed. As a result, duloxetine is not a first-choice antidepressant where liver risk is a concern.
Seizure history and epilepsy caution
Duloxetine can lower the seizure threshold. In particular, duloxetine should be used cautiously in patients with a history of epilepsy or seizures, and started only where seizure control is stable. However, if seizures occur or increase in frequency during duloxetine treatment, the medicine should be stopped. Additionally, disclose any personal or strong family history of seizures during consultation. As a result, prescriber judgement is needed rather than automatic prescribing in seizure-prone patients.
Nausea in the first weeks
Nausea is the most common early side effect of duloxetine, affecting a substantial minority of patients particularly in the first 1 to 2 weeks. In particular, it's usually mild-to-moderate and settles as your body adapts. However, taking duloxetine with food can reduce this, and starting at 30mg (rather than 60mg for depression) is sometimes chosen partly to soften the early nausea. Additionally, if nausea is severe or persistent beyond 2 weeks, contact your prescriber; dose reduction or a different medicine may be needed. As a result, this is a well-known feature of starting duloxetine that most patients ride out but a minority find intolerable.
Suicidal thoughts and behaviours, especially under 25
Antidepressants can occasionally increase suicidal thoughts or self-harming behaviour, particularly in patients under 25. In particular, this risk is highest in the first few weeks of treatment and after dose changes. Additionally, family, friends, and prescribers should watch for signs of worsening mood, agitation, or new suicidal thinking. However, if you or someone close to you notices concerning changes, contact your prescriber urgently. Furthermore, if you're in immediate danger, contact the crisis services listed at the start and end of this page. Above all, the risk of untreated depression itself remains higher than the risk from treatment for most patients.
Bipolar disorder screening
Duloxetine can occasionally trigger manic or hypomanic episodes in patients with underlying bipolar disorder. In particular, this is why it's important to disclose any history of mania, hypomania, or mood episodes that felt unusually 'high' during consultation. However, bipolar depression is often better treated with different approaches. Additionally, family history of bipolar disorder is also relevant. As a result, careful history-taking is part of prescriber-led duloxetine treatment.
Serotonin syndrome
Serotonin syndrome is a rare but potentially serious reaction when serotonin activity becomes excessive. In particular, symptoms include high fever, sweating, muscle rigidity, tremor, agitation, confusion, rapid heart rate, and unstable blood pressure. However, the risk is much higher when duloxetine is combined with other serotonergic drugs (see Drug interactions). Additionally, if you develop these symptoms, seek urgent medical help immediately. As a result, always tell prescribers you're taking duloxetine before starting any new medicine.
Bleeding risk
SSRIs and SNRIs including duloxetine can increase the risk of bleeding, particularly in the gut. Firstly, this risk is higher when combined with non-steroidal anti-inflammatory drugs (NSAIDs) like ibuprofen, aspirin, or anticoagulants (warfarin, DOACs). Additionally, it may present as unusual bruising, nosebleeds, or gastrointestinal bleeding. However, patients on these combinations may benefit from a proton pump inhibitor for stomach protection. As a result, tell your prescriber about all other medicines you take.
Hyponatraemia (low sodium)
SSRIs and SNRIs including duloxetine can occasionally cause low blood sodium (hyponatraemia), especially in older adults. In particular, symptoms include headache, difficulty concentrating, confusion, weakness, and in severe cases seizures. However, this is more common in patients over 65 or those on diuretics. Additionally, if you develop these symptoms, seek medical assessment promptly. As a result, older adults may need periodic sodium checks during treatment.
Blood pressure monitoring
Duloxetine's noradrenergic action can raise blood pressure. In particular, dose-dependent increases in blood pressure and occasional hypertensive crises have been reported. However, this is why prescribers check blood pressure before starting duloxetine and monitor it periodically during treatment, especially in the first month, after dose increases, and in patients with pre-existing high blood pressure. Additionally, uncontrolled hypertension is a contraindication; duloxetine should not be started in patients whose blood pressure is not adequately controlled. Furthermore, if your blood pressure rises significantly during treatment, dose reduction or stopping duloxetine may be needed. As a result, disclose any hypertension history and current blood pressure readings during consultation.
Severe renal impairment (contraindicated)
Duloxetine is contraindicated in patients with severe renal impairment (creatinine clearance below 30 ml/min). In particular, this is because duloxetine and its metabolites accumulate in severe kidney disease, raising plasma levels and side-effect risk. However, mild to moderate renal impairment doesn't require dose adjustment. Additionally, disclose any kidney disease during consultation so this can be properly assessed.
Sucrose excipient (rare hereditary intolerance)
Duloxetine capsules contain sucrose (up to about 56mg per capsule) as part of the enteric-coated pellet formulation. In particular, patients with rare hereditary problems of fructose intolerance, glucose-galactose malabsorption, or sucrase-isomaltase insufficiency should not take duloxetine. However, these conditions are uncommon; disclose any known sugar-absorption disorders during consultation.
Pregnancy and breastfeeding
Decisions about duloxetine in pregnancy are individual and need specialist input. In particular, untreated depression or anxiety in pregnancy carries risks for both parent and baby. However, use of duloxetine in late pregnancy has been associated with a small increased risk of persistent pulmonary hypertension of the newborn (PPHN), premature birth (mostly between weeks 35-36), and postpartum haemorrhage in the parent. Additionally, duloxetine passes into breast milk and use during breastfeeding is generally not recommended (unlike some SSRIs which are considered more compatible). Furthermore, discuss pregnancy, planning pregnancy, or breastfeeding with your prescriber to weigh the individual situation.
Discontinuation syndrome
Above all, do not stop duloxetine suddenly. In particular, sudden stopping often causes a noticeable discontinuation syndrome with dizziness, sensory disturbances ('brain zaps' or electric-shock sensations), sleep problems, agitation, headache, nausea, and mood changes. However, SNRI discontinuation is generally more pronounced than SSRI discontinuation because of the shorter half-life; symptoms can appear within days of missed or reduced doses. Additionally, planned gradual tapering under prescriber guidance over at least 2 weeks (often longer) reduces this risk significantly. Above all, if you want to stop duloxetine, plan this with your prescriber rather than stopping suddenly.
Side effects of Duloxetine 30mg
Common start-up effects (first 2 to 4 weeks)
The most common early side effects include nausea, diarrhoea, headache, insomnia or drowsiness, dry mouth, and mild anxiety or restlessness. In particular, these often settle within the first 2 to 4 weeks as your body adapts. However, they're usually mild and manageable. Additionally, taking duloxetine with food can reduce nausea. As a result, don't stop treatment in the first few weeks based on these effects alone; contact your prescriber to discuss whether to continue, adjust timing, or change dose.
Sexual side effects
SSRIs and SNRIs including duloxetine can cause sexual side effects. In particular, this includes reduced libido, delayed or absent orgasm, and (in men) delayed ejaculation. However, these effects are common and often persist while on treatment. Additionally, they usually resolve after stopping duloxetine, though rare cases of persistent effects have been reported. Furthermore, if sexual side effects are troublesome, discuss with your prescriber; sometimes dose adjustment, timing changes, or switching medicines can help. As a result, this is a topic worth raising openly during review.
Weight changes
Duloxetine can cause weight changes in either direction. In particular, some patients lose weight early in treatment (often related to nausea or reduced appetite). However, others gain weight over months of treatment. Additionally, the effect varies substantially between individuals. Furthermore, if weight changes are troublesome, discuss with your prescriber. As a result, weight isn't usually a reason to avoid duloxetine but is worth monitoring.
Serious side effects requiring urgent help
Seek urgent help for signs of serotonin syndrome (high fever, muscle rigidity, agitation, confusion). Similarly, seek help for suicidal thoughts or new self-harming urges, especially in the first few weeks. Additionally, seek help for signs of severe allergic reaction (facial swelling, difficulty breathing, widespread rash). However, unusual bleeding or bruising warrants prescriber contact. Furthermore, symptoms of low sodium (severe headache, confusion, weakness) need medical assessment. Above all, if you're in immediate danger, contact the crisis services listed at the top and bottom of this page.
Yellow Card reporting
Report any suspected side effects to the MHRA Yellow Card scheme at yellowcard.mhra.gov.uk or via the Yellow Card app.
Drug interactions with Duloxetine 30mg
CYP1A2 inhibitors (contraindicated combinations)
Above all, duloxetine is metabolised primarily by the liver enzyme CYP1A2, so strong CYP1A2 inhibitors are contraindicated. In particular, fluvoxamine (an SSRI) and the fluoroquinolone antibiotics ciprofloxacin and enoxacin must not be combined with duloxetine — they dramatically raise duloxetine blood levels and increase side-effect and toxicity risk. Additionally, smoking induces CYP1A2, so heavy smokers may have somewhat lower duloxetine levels and prescribers should be aware if smoking status changes during treatment. However, moderate CYP1A2 inhibitors (like certain oral contraceptives) may raise duloxetine levels somewhat and warrant caution. Furthermore, disclose all regular medicines and smoking status during consultation. As a result, this interaction profile is distinctive to duloxetine among SNRIs and antidepressants.
CYP2D6 inhibition (moderate effect on other medicines)
Duloxetine is a moderate inhibitor of the liver enzyme CYP2D6, which metabolises many other medicines. In particular, this can raise blood levels of medicines that depend on CYP2D6, including some tricyclic antidepressants (amitriptyline, nortriptyline), some antipsychotics (risperidone, aripiprazole), some antiarrhythmics (flecainide, propafenone), and tamoxifen (breast cancer prevention/treatment — a significant consideration because duloxetine can reduce conversion of tamoxifen to its active metabolite). Additionally, dose adjustment or an alternative medicine may be needed for some combinations. However, disclose your full medication list including over-the-counter medicines during consultation. Furthermore, duloxetine's CYP2D6 inhibition is moderate rather than strong (fluoxetine and paroxetine are stronger CYP2D6 inhibitors), so clinically significant interactions are less common than with those SSRIs.
Monoamine oxidase inhibitors (MAOIs)
Above all, do not combine duloxetine with MAOIs (such as phenelzine, isocarboxazid, tranylcypromine) or the reversible MAOI moclobemide. In particular, this combination can cause life-threatening serotonin syndrome. Additionally, at least 14 days should pass between stopping an MAOI and starting duloxetine. However, at least 5 days should pass between stopping duloxetine and starting an MAOI (shorter than fluoxetine's 5-week washout because duloxetine has a much shorter half-life). Furthermore, linezolid (an antibiotic) and methylene blue have MAOI-like properties and the same interaction concern applies. As a result, MAOI washout planning is required in both directions.
Other serotonergic drugs
However, several other medicines increase serotonin activity and can raise the risk of serotonin syndrome when combined with duloxetine. In particular, this includes other SSRIs, SNRIs (venlafaxine, duloxetine), tricyclic antidepressants, tramadol, pethidine, triptans (migraine treatments), St John's wort, and recreational drugs like MDMA. Additionally, disclose all medicines including herbal remedies and any illicit drug use during consultation. As a result, safe prescribing depends on knowing what else you take.
NSAIDs and blood thinners
Additionally, duloxetine can increase the risk of bleeding when combined with NSAIDs (ibuprofen, naproxen, aspirin), anticoagulants (warfarin, DOACs like apixaban), and antiplatelet drugs (clopidogrel). However, if these combinations are needed, your prescriber may add a proton pump inhibitor for stomach protection. Furthermore, disclose any regular painkiller or blood thinner use during consultation.
Alcohol and recreational drugs
Alcohol is not recommended during duloxetine treatment. In particular, it can worsen depression and increase sedation. Additionally, recreational drugs (particularly MDMA, cocaine, amphetamines) can interact with duloxetine and increase the risk of serotonin syndrome or worsen mental health symptoms. However, disclosing recreational drug use during consultation is important for safe treatment. Furthermore, this information is treated confidentially and shapes safe prescribing rather than affecting judgement.
Frequently asked questions about Duloxetine 30mg
How quickly does duloxetine work?
Some early benefit (sleep, appetite, mild mood lift) may appear within 1 to 2 weeks. However, most patients notice meaningful improvement at 2 to 4 weeks, and full effect usually takes 6 to 8 weeks. However, don't judge whether duloxetine is working in the first 2 weeks.
Will duloxetine change my personality?
Duloxetine doesn't change core personality. In particular, it helps regulate the mood chemistry that depression disrupts. However, many patients describe feeling more like themselves rather than different. Additionally, if you feel emotionally 'flattened' or numbed on duloxetine, discuss this with your prescriber; sometimes dose or medicine changes can help.
Is duloxetine addictive?
Duloxetine is not addictive in the way that terms like 'addictive' are usually understood. In particular, it doesn't cause craving, tolerance, or drug-seeking behaviour. However, stopping suddenly can cause discontinuation symptoms because your brain has adapted to its presence. However, this is why gradual tapering under prescriber guidance is important when the time comes to stop.
How long will I need to take it?
For a first episode of depression, treatment usually continues for at least 6 to 9 months after symptoms improve. In particular, this reduces the risk of relapse. However, for recurrent depression, longer-term treatment may be recommended. Additionally, decisions about duration are made with your prescriber based on your circumstances and treatment history.
Can I take duloxetine while pregnant?
This is an individual decision that needs specialist input. In particular, untreated depression or anxiety in pregnancy also carries risks. However, duloxetine use in late pregnancy has been associated with a small increased risk of persistent pulmonary hypertension of the newborn (PPHN), premature birth (mostly between weeks 35-36), and postpartum haemorrhage. Additionally, some SSRIs may be preferred over duloxetine during pregnancy where an antidepressant is judged necessary. Furthermore, discuss pregnancy or planning pregnancy with your prescriber to weigh the individual risks and benefits.
Can I take duloxetine while breastfeeding?
Duloxetine and its metabolites pass into breast milk, and adverse events have been reported in breastfed infants. In particular, the use of duloxetine while breastfeeding is generally not recommended. However, if antidepressant treatment is needed during breastfeeding, some SSRIs are typically preferred over duloxetine. Additionally, discuss any pregnancy plans, birth, or breastfeeding intentions with your prescriber so the safest option can be planned.
Can I drink alcohol on duloxetine?
Alcohol is not recommended during duloxetine treatment. In particular, it can worsen depression, undermine treatment, and increase sedation. However, occasional light drinking is unlikely to be dangerous but is generally advised against. Additionally, if alcohol use is difficult to reduce, discuss with your prescriber.
What if duloxetine doesn't work for me?
Not everyone responds to duloxetine, and this is common with antidepressants. Firstly, if you've had 4 to 6 weeks at a therapeutic dose without benefit, contact your prescriber. However, options include increasing the dose, switching to a different antidepressant, adding a second medicine, or adding talking therapy. As a result, treatment resistance is a signal for review, not a reason to give up.
Can I take duloxetine with other medicines?
Duloxetine has several important interactions. In particular, avoid combining with MAOIs, other SSRIs/SNRIs, tramadol, triptans, and St John's wort without prescriber guidance. Additionally, strong CYP1A2 inhibitors (fluvoxamine, ciprofloxacin, enoxacin) are contraindicated because they dramatically raise duloxetine levels. However, duloxetine is a moderate CYP2D6 inhibitor, so it raises levels of some tricyclics, antipsychotics, and tamoxifen (see Drug interactions section for details). Furthermore, disclose all regular medicines during consultation including herbal remedies and over-the-counter medicines. As a result, common medicines like paracetamol are generally safe with duloxetine, but the interaction check matters.
Do I need a blood pressure or heart check before starting duloxetine?
A blood pressure check is standard practice before starting duloxetine and periodically during treatment. In particular, duloxetine's noradrenergic activity can raise blood pressure and (rarely) trigger hypertensive crises, so pre-treatment BP measurement, control of any existing hypertension, and ongoing monitoring matter. However, routine pre-treatment ECG is not required — duloxetine does not carry the MHRA QT interval prolongation warning that applies to citalopram and escitalopram. Additionally, disclose all cardiac conditions and current medicines during consultation. Furthermore, uncontrolled hypertension is a contraindication; duloxetine should not be started until blood pressure is adequately managed.
Will duloxetine make me gain weight?
Weight changes on duloxetine vary. In particular, some patients lose weight early (often from reduced appetite or nausea). However, others gain weight over months of treatment. Additionally, the effect isn't predictable. Furthermore, if weight is a concern, mention it during consultation so your prescriber can factor it into the treatment plan.
Will it affect my sex life?
SSRIs and SNRIs including duloxetine commonly cause sexual side effects like reduced libido, delayed orgasm, or (in men) delayed ejaculation. However, these effects vary between individuals but are common enough that they should be discussed openly. Additionally, if sexual side effects are troublesome, your prescriber may adjust dose, timing, or medicine to help.
Can I stop taking duloxetine suddenly?
No. Stopping suddenly can cause discontinuation symptoms including flu-like feelings, dizziness, sensory disturbances, and mood changes. Instead, plan a gradual tapering with your prescriber over weeks or months. However, this approach reduces the risk of discontinuation effects significantly.
Can I drive while taking duloxetine?
Most patients can drive normally on duloxetine. However, some experience drowsiness, dizziness, or blurred vision, especially early in treatment or after a dose change. In particular, avoid driving until you know how duloxetine affects you. Additionally, follow DVLA guidance if you experience side effects that affect driving safely.
Do I still need talking therapy if I'm on duloxetine?
NICE recommends combined treatment (antidepressant plus talking therapy) for most people with moderate to severe depression. In particular, this combination often gives better outcomes than either alone. However, NHS Talking Therapies can be accessed by self-referral in England. Additionally, private therapy is another route. As a result, duloxetine is one part of care, not the whole thing.
Is duloxetine safe for teenagers?
Duloxetine is not UK-licensed for children or adolescents under 18. In particular, safety and efficacy have not been established in this age group. Additionally, fluoxetine is the SSRI most commonly considered for adolescent depression (under specialist supervision, as it's the only SSRI licensed for depression in children 8+ in the UK). However, all antidepressant use in under-25s requires closer monitoring for suicidal thoughts. As a result, paediatric depression or anxiety treatment needs specialist referral rather than general prescribing, and duloxetine is not part of the paediatric options.
What if I feel worse in the first few weeks?
Some worsening of anxiety or restlessness can occur in the first 1 to 2 weeks as your body adjusts. In particular, this usually settles. However, if you notice suicidal thoughts, severe agitation, or unusual mood changes, contact your prescriber urgently and seek crisis support if needed. Additionally, don't stop duloxetine without prescriber guidance; sudden stopping can cause its own problems.
Do I need blood tests while on duloxetine?
Routine blood monitoring isn't required for most patients on duloxetine. However, older adults or those on medicines that affect sodium may benefit from periodic sodium checks. However, if you develop specific side effects, your prescriber may arrange targeted tests. As a result, discuss any monitoring needs at your consultation.
Can I take duloxetine in the morning or should it be at night?
Either is fine. In particular, if duloxetine makes you feel sleepy, evening dosing suits you. However, if it causes insomnia, morning dosing usually helps. Additionally, consistency matters more than the specific time, so pick whichever fits your routine and stick with it.
Do I need a prescription from Courier Pharmacy?
Yes. Duloxetine 30mg is a Prescription Only Medicine. A UK-qualified prescriber must review your consultation. You can complete this at courierpharmacy.co.uk.
What if I need to be switched to a different antidepressant?
This is common and usually straightforward with prescriber guidance. In particular, switching between SSRIs is often done with a short overlap or brief washout. However, switching to or from certain other antidepressants (especially MAOIs) needs a longer washout for safety. Additionally, never make the switch yourself; work with your prescriber to plan it safely.
If you're in crisis
Depression can be exhausting and, at times, dangerous. If you're struggling right now, please talk to someone. You don't have to work this out alone.
Samaritans: call 116 123 (free, 24 hours a day, 365 days a year)
SHOUT: text SHOUT to 85258 for free crisis text support in the UK
NHS 111: call 111 and choose the mental health option
For immediate danger to life: call 999 or go to your nearest A&E
Additionally, NHS Talking Therapies (formerly IAPT) offer free psychological therapy for depression and anxiety in England and can be accessed by self-referral. Furthermore, Mind, Rethink Mental Illness, and other charities provide information, peer support, and advocacy.
Disclaimer
Disclaimer: This information is for education only and isn't a substitute for personal medical advice. Always follow your prescriber's instructions.
National Institute for Health and Care Excellence (2022) Depression in adults: treatment and management. NICE guideline NG222. Available at: https://www.nice.org.uk/guidance/ng222
