Duloxetine (Cymbalta): Uses, Dosage, Side Effects, and What to Expect
Duloxetine (brand name Cymbalta) is an SNRI antidepressant FDA-approved for depression, generalized anxiety disorder, and several chronic pain conditions. That combination is its main advantage: when depression or anxiety comes with nerve pain, fibromyalgia, or chronic back or joint pain, one medication can target both. Most adults take 30 to 60 mg once a day. Nausea is the most common early side effect, and because of rare liver risk, it isn’t a good choice for people who drink heavily or have liver disease.
Serotonin-norepinephrine reuptake inhibitor (SNRI)
60 mg once daily
Treating mood and chronic pain together
No. Can be prescribed by telehealth
What Is Duloxetine Used For?
- Major depressive disorder in adults (depression treatment)
- Generalized anxiety disorder in adults and children 7 and older (anxiety treatment)
- Diabetic peripheral neuropathic pain
- Fibromyalgia in adults and teens 13 and older
- Chronic musculoskeletal pain, such as chronic low back pain and osteoarthritis pain
How Does Duloxetine Work?
Duloxetine blocks the reuptake of both serotonin and norepinephrine. In the brain this helps mood and anxiety. In the spinal cord, these same messengers help turn down pain signals, which is why duloxetine also eases certain chronic pain. The pain effect can show up sooner than the mood effect.
Duloxetine Dosage
| Condition (adults) | Starting | Target | Maximum |
|---|---|---|---|
| Depression | 40–60 mg (often 30 mg for 1 week) | 60 mg | 120 mg |
| Generalized anxiety | 60 mg (30 mg in older adults) | 60 mg | 120 mg |
| Diabetic nerve pain | 60 mg | 60 mg | 60 mg |
| Fibromyalgia, musculoskeletal pain | 30 mg for 1 week | 60 mg | 60 mg |
Source: Duloxetine FDA prescribing information.
- Take it once a day, with or without food. Taking it with food can reduce nausea.
- Swallow the capsule whole. Don’t crush, chew, or open it.
- Its half-life is about 12 hours, so try not to miss doses.
How Long Does Duloxetine Take to Work?
Pain relief can start within 1 to 2 weeks for some people. Mood and anxiety usually improve over 4 to 6 weeks, with full effect by 8 to 12 weeks. Starting at 30 mg for the first week helps many people get past early nausea.
Duloxetine Side Effects
| Side effect | Duloxetine | Placebo |
|---|---|---|
| Nausea | 23% | 8% |
| Dry mouth | 13% | 5% |
| Drowsiness | 10% | 3% |
| Fatigue, insomnia, constipation, dizziness | 9% each | 4–5% |
| Decreased appetite | 7% | 2% |
| Sweating | 6% | 1% |
Source: Duloxetine FDA prescribing information, pooled adult trials.
Sexual side effects, such as lower libido and delayed orgasm, also occur, as with other SNRIs and SSRIs.
Serious but less common risks
- Liver injury. Rare but sometimes serious. Report yellowing skin or eyes, dark urine, itching, or right-sided belly pain.
- Blood pressure increases, usually small; checked before and during treatment
- Trouble urinating, including urinary retention in rare cases
- Serotonin syndrome with other serotonergic drugs
- Bleeding risk, low sodium, mania in undiagnosed bipolar disorder, and angle-closure glaucoma
Who Should Be Careful With Duloxetine
- Heavy alcohol use or chronic liver disease. The label advises avoiding duloxetine in these situations.
- Severe kidney disease (GFR below 30). Avoid.
- Do not combine with an MAOI or within 14 days of one (wait 5 days after stopping duloxetine before an MAOI)
- Thioridazine should not be combined with it
- Strong CYP1A2 inhibitors, such as fluvoxamine and ciprofloxacin, should be avoided because they raise duloxetine levels
- Uncontrolled high blood pressure, bipolar disorder, seizures, narrow-angle glaucoma, or bleeding risk
Stopping: taper with your prescriber. Abrupt stops can cause dizziness, nausea, headache, irritability, nightmares, and “brain zaps.”
Duloxetine vs. Venlafaxine
| Duloxetine (Cymbalta) | Venlafaxine (Effexor XR) | |
|---|---|---|
| Approved for pain | Yes (nerve pain, fibromyalgia, musculoskeletal) | No (used off-label) |
| Approved anxiety uses | GAD | GAD, social anxiety, panic |
| Half-life | About 12 hours | About 5 hours (metabolite 11) |
| Key caution | Liver disease, heavy alcohol use | Blood pressure, withdrawal |
See our full venlafaxine (Effexor XR) guide.
How We Approach Duloxetine at Samz Mental Health
- Consider it when mood and pain overlap, which is common and often under-treated
- Screen for liver disease, alcohol use, kidney function, and blood pressure before starting
- Start low to limit nausea and increase deliberately
- Coordinate with your other clinicians on pain care, and track progress through ongoing medication management
Can You Get Duloxetine Prescribed Online?
Yes. Duloxetine isn’t a controlled substance, so a licensed prescriber can prescribe it after a telehealth evaluation when appropriate. Samz Mental Health offers video visits for adults physically located in Texas, New York, Florida, Colorado, Washington, Maryland, New Hampshire, New Mexico, and Iowa.
In-network with Aetna, Cigna, UnitedHealthcare, Optum, and Carelon Behavioral Health. See insurance details. Need to be seen soon? We offer same-day psychiatrist appointments.
Frequently Asked Questions About Duloxetine
What is duloxetine used for?
Depression, generalized anxiety, diabetic nerve pain, fibromyalgia, and chronic musculoskeletal pain.
What is the usual duloxetine dose?
Usually 60 mg once daily, often starting at 30 mg for a week.
Does duloxetine help with pain and depression at the same time?
Yes. It’s FDA-approved for both, which makes it a common choice when they overlap.
How long does duloxetine take to work?
Pain may ease in 1 to 2 weeks; mood and anxiety over 4 to 6 weeks.
Can I drink alcohol on duloxetine?
Avoid heavy drinking because of rare liver injury risk.
What are the most common side effects of duloxetine?
Nausea, dry mouth, drowsiness, fatigue, insomnia, constipation, dizziness, and sweating.
Can I stop duloxetine suddenly?
No. Taper with your prescriber.
Can I get duloxetine prescribed online?
Yes, after a telehealth evaluation. Samz Mental Health sees patients by video in nine states.
Talk to a Provider About Duloxetine
Book a video evaluation with a board-certified psychiatric nurse practitioner. Same-day appointments available. No referral needed.
References
- Duloxetine delayed-release capsules prescribing information. Drugs.com professional label; also on DailyMed.
Medical disclaimer: This page is for education and is not a substitute for a personal medical evaluation. Don’t start, stop, or change any medication without talking to your prescriber. If you’re in crisis or thinking about harming yourself, call or text 988 (Suicide & Crisis Lifeline) or call 911.