If you have been diagnosed with an anxiety disorder, there are a few medications that your doctor may prescribe. One of the most common treatments is Cymbalta. Whether you’re already taking Cymbalta for anxiety or are thinking about taking it, it’s important to know a few things about this medication first. Here we’ll look at how Cymbalta works and some common side effects to be aware of.
If you’re not sure whether Cymbalta is right for you, talking to a psychiatrist is a great first step. They can look at your anxiety symptoms and full health history to figure out the best path forward.
What Is Cymbalta?
Cymbalta (duloxetine) is an SNRI used for anxiety and other mental health and pain conditions. SNRI stands for serotonin-norepinephrine reuptake inhibitor.1 This means that it helps specific chemicals in your brain stay active for longer so you can better manage your mood, anxiety and stress.
You may have heard of other medications like Lexapro and Prozac. These work a little differently, since they are SSRIs (selective serotonin reuptake inhibitors). They mainly affect one brain chemical: serotonin.
While Cymbalta also works on serotonin, it also works on norepinephrine. Norepinephrine plays a role in your stress response, focus, energy and physical tension.
Anxiety not only causes emotional symptoms, but physical ones too. Tight muscles, racing heart, feeling on edge and exhaustion from constantly being on high alert are common physical symptoms many people with anxiety deal with.
Related: SSRI vs SNRI: Differences, Benefits, and How They Work
Who Is Cymbalta for?
Cymbalta is prescribed for several reasons. It’s primarily used to treat depression, but it’s also FDA-approved to treat anxiety, specifically generalized anxiety disorder.1 It’s also approved for chronic pain conditions like fibromyalgia, muscle pain, and diabetic peripheral neuropathy.
It is unique because it has been approved to treat both certain mental health conditions and several chronic pain conditions. Some physical symptoms people with anxiety experience include headaches, stomach problems, muscle tension, and chronic pain.
Cymbalta is a serotonin-norepinephrine reuptake inhibitor or SNRI. This means it works by raising serotonin and norepinephrine levels in the brain, neurotransmitters linked to both mood and the body’s stress response. Cymbalta may help improve overall mood and well-being.
Nick Triviso, PMHNP, a Nurse Practitioner at Neuro Wellness Spa
What To Expect When You’re Taking Cymbalta for Anxiety
Although it can vary from person to person, research shows that it takes about 2 to 4 weeks for Cymbalta to start working.2 However, it’s not out of the question for it to take up to 6 to 8 weeks before you start noticing a significant difference in your mood.
How long it may take for Cymbalta to work for you depends on several things, including your age, medical history, metabolism, pre-existing conditions and whether you’re taking any other medications along with Cymbalta.
What Do the Early Weeks on Cymbalta Feel Like?
When you first start taking duloxetine for anxiety, your body will go through an adjustment period. Cymbalta acts to inhibit both your serotonin and norepinephrine transporters.3 As a result, your brain needs time to adjust. You may feel both energized and tired at the same time. Some people experience nausea, insomnia and jitteriness. Some people feel as though they’ve had too much caffeine.
As your brain and body adjust to Cymbalta, you may experience increased anxiety, irritability, restlessness or emotional blunting. These symptoms often improve over time as your body adapts to the medication.
Common Side Effects Associated With Cymbalta Anxiety Medication
Like with all medicines, taking duloxetine for anxiety can cause some side effects. Most people experience minor side effects, and some of the most common ones will gradually get better as your body becomes used to the medication.
Minor side effects that usually resolve within a few weeks include:4
- Restlessness – Jitteriness, mild headaches and some dizziness (especially when standing up too fast).
- Gastrointestinal problems – You may experience constipation, diarrhea or reduced appetite. About 1 in 4 people may have some nausea.5
- Sleep issues – Nighttime insomnia and drowsiness during the day are very common, but get better once your sleep cycles adapt.
These side effects are your body’s way of reacting to the sudden increase of serotonin and norepinephrine in your system. For most people, they will improve over time as your body adjusts to the medication.
Related: Side Effects of Antidepressants: A Comprehensive Guide
If you’re dealing with side effects that feel hard to manage, don’t just push through it alone. A psychiatrist can work with you to adjust your dosage or explore other options that might be a better fit.
Long-Term Side Effects
Some side effects are less likely to disappear on their own. They may persist for as long as you take Cymbalta. These may include:1
- Excessive sweating (and night sweats)
- Sexual dysfunction (lowered sex drive and difficulty reaching orgasm)
- Increased blood pressure (slight baseline increase)
- Dry mouth
If you experience these side effects, speak with your doctor. They may adjust your medication to safely step down your dosage and prevent withdrawal symptoms that can appear if you stop taking it too abruptly.
Cymbalta Boxed Warning
Cymbalta carries an FDA warning regarding possible suicidal thoughts and behaviors in children and young adults.1 There is also a risk of serotonin syndrome, a potentially serious condition that can occur when serotonin levels in the body get too high, particularly if Cymbalta is combined with other medications that affect serotonin. For this reason, it is essential to work closely with your prescriber and report any changes in thoughts, behaviors, or physical symptoms while on this medication.
Cymbalta Dosing and Titration Schedule
Prescribers often use a titration schedule that gradually increases your dosage, which will bring you symptom relief while minimizing any side effects.
Your prescriber will likely begin with as low a dose as possible to help your body adjust to the medication while reducing those early onset side effects. They may start you with a lower dose for the first couple of weeks. Then, they may slowly increase the amount, depending on how well you tolerate it.
Not everyone will have the same reaction to Cymbalta. A careful prescriber will move as gradually as possible if you were to experience more bothersome side effects. They will keep an eye out for symptom changes by checking your sleep, appetite, anxiety, mood and blood pressure. Most will typically adjust your medication one step at a time.
Is Cymbalta the Right Fit for Your Anxiety?
Managing an anxiety disorder looks different for everyone, and Cymbalta is just one of several tools that may help. For some people, it makes a real difference in reducing anxiety symptoms and improving day-to-day functioning. For others, a different medication or a combination of approaches works better. What matters most is that you don’t have to figure it out on your own. A good psychiatrist will work with you to find what anxiety treatment actually fits your life.
Nick Triviso, PMHNP, a nurse practitioner at Neuro Wellness Spa, puts it plainly:
Cymbatla is usually the second line for patients who are unable to tolerate SSRI. For some patients it is the better alternative to help them with their anxiety and or depression.
Thinking about medication for your anxiety? Neuro Wellness Spa’s psychiatrists make it easy to get started and find what actually works for you.
At Neuro Wellness Spa, our psychiatrists take the time to understand your full picture before recommending anything. Reach out to our anxiety experts to learn more about our mental health treatment options, including in-person and online psychiatry and medication management. We are in-network with nearly every insurance provider, and our fast appointment scheduling means you won’t have to wait months to get seen. If you’re ready to take the next step, we’re ready to help.
References
- DailyMed – CYMBALTA- duloxetine hydrochloride capsule, delayed release. (2026). Nih.gov. https://dailymed.nlm.nih.gov/dailymed/lookup.cfm?setid=81a06b90-50d3-40c1-98ca-0e344c76b2c4
- Brannan SK, Mallinckrodt CH, Detke MJ, Watkin JG, Tollefson GD. Onset of action for duloxetine 60 mg once daily: double-blind, placebo-controlled studies. J Psychiatr Res. 2005 Mar;39(2):161-72. doi: 10.1016/j.jpsychires.2004.05.005. PMID: 15589564. https://pubmed.ncbi.nlm.nih.gov/15589564/
- Chalon SA, Granier LA, Vandenhende FR, Bieck PR, Bymaster FP, Joliat MJ, Hirth C, Potter WZ. Duloxetine increases serotonin and norepinephrine availability in healthy subjects: a double-blind, controlled study. Neuropsychopharmacology. 2003 Sep;28(9):1685-93. doi: 10.1038/sj.npp.1300209. Epub 2003 May 28. PMID: 12784100. https://pubmed.ncbi.nlm.nih.gov/12784100/
- NHS. (2022, February 17). Side effects of duloxetine. Nhs.uk. https://www.nhs.uk/medicines/duloxetine/side-effects-of-duloxetine/
- Skljarevski V, Zhang S, Iyengar S, D’Souza D, Alaka K, Chappell A, Wernicke J. Efficacy of Duloxetine in Patients with Chronic Pain Conditions. Curr Drug ther. 2011 Nov;6(4):296-303. doi: 10.2174/157488511798109592. PMID: 22876216; PMCID: PMC3412202. https://pmc.ncbi.nlm.nih.gov/articles/PMC3412202/