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Reviewed by Kristin Hall, FNP
Written by Our Editorial Team
Let’s talk antidepressants for a second. While movies and TV have mocked or misrepresented depression and the medications that treat it, the reality is, there’s basically no reason to apply stigma to either one — they’re both incredibly common.
According to the National Institute of Mental Health, about 21 million U.S. adults have depression. And for many of these people, one of the most effective ways to stop feeling depressed is to take depression medications like duloxetine for some relief.
Here’s the thing: Prescription medications often come with side effects. You hear them rattled off at the end of a commercial and roll your eyes, wondering, Are the benefits really worth the risks?
That’s ultimately up to you to decide. We’re just here to provide information to help you make that decision, including the common side effects, more serious side effects, interactions and other risks associated with duloxetine.
Let’s get into it.
Before we jump into the side effects, it’s important to know what duloxetine is — because it’s not like most antidepressants on the market today.
Duloxetine is what’s known as a serotonin-norepinephrine reuptake inhibitor, or SNRI. These drugs work primarily on two chemicals in the brain: serotonin and norepinephrine. By increasing the amounts of both, it can improve mood and pain conditions.
Duloxetine (often sold under the brand name Cymbalta) is used for the treatment of several conditions, including:
Major depressive disorder (MDD)
Generalized anxiety disorder (GAD)
Diabetic neuropathy (nerve pain)
Chronic musculoskeletal pain
That’s an impressive resume. But even if it’s the best treatment for a number of conditions, duloxetine still may not be the “right” treatment for people who struggle with the side effects.
So what side effects should you be worried about? According to the U.S. Food and Drug Administration (FDA), the most common side effects include:
Sleepiness or tiredness
Fatigue and drowsiness
Weight loss or weight gain
Sexual dysfunction, including anorgasmia and (for men) ejaculation issues
If you experience abnormal or serious side effects when switching your medication to duloxetine or while taking it, contact your healthcare provider for proper medical advice right away. While some effects might be temporary or minor, the serious stuff can create a world of problems.
Possible side effects of duloxetine that could be very serious include:
Serious liver problems and skin yellowing
Hyponatremia (sudden low sodium levels)
A particular form of glaucoma called angle-closure glaucoma
Allergic reactions, including skin reactions and trouble breathing
Increased risk of suicide
One of the most serious is an increase in suicidal thoughts. The FDA issues a black box warning for duloxetine for this very reason.
In the early phases of treatment, you may experience worsening depression, including suicidal thoughts or tendencies. Don’t ignore these feelings. Contact your healthcare provider immediately if your depression symptoms seem to be getting worse.
There are several additional risks associated with duloxetine use, including:
Withdrawal or discontinuation symptoms
You’ll want to go through these at least once before taking duloxetine. This can help you prevent some new-user problems, and it may also help you avoid life-threatening medical conditions.
Duloxetine may negatively interact with other drugs, so tell your healthcare provider about any and all medications you currently take — prescription, over-the-counter and even nutritional supplements — before you get a prescription for duloxetine online.
Some drugs that don’t “play well” with duloxetine include:
Selective serotonin reuptake inhibitors (SSRIs) like paroxetine and fluoxetine
Monoamine oxidase inhibitors (MAOIs), including phenelzine
Non-steroidal anti-inflammatory drugs (NSAIDs), such as naproxen and ibuprofen
St. John’s wort
Medications for high blood pressure
We also have to touch on the “What happens if I take too much duloxetine?” question.
Duloxetine can increase your chances of suffering from serious adverse effects, including a potentially lethal condition called serotonin syndrome.
Serotonin syndrome is basically an overdose of serotonin, which can lead to serious symptoms and potentially death. Luckily, avoiding this is relatively easy — take the prescribed amount of medication only, and simply wait until the next dose if you forget to take it within a short window of your normal time each day.
While you won’t experience an addiction-like withdrawal from discontinuing duloxetine, you could experience withdrawal-type effects if you’ve taken Cymbalta for a long time before suddenly stopping.
Symptoms include increased suicidal thoughts, returning depression symptoms and trouble sleeping, among others.
For these reasons, when you stop taking duloxetine, you need to taper down your medication under the guidance of your healthcare provider.
There are several other things to keep in mind before taking duloxetine. You shouldn’t take duloxetine without talking to your healthcare provider if you have:
Bipolar disorder. Duloxetine is not a safe or effective treatment for bipolar disorder, so if you’ve been diagnosed with this mental health condition, consider alternatives with your healthcare provider.
Liver disease. If you have liver disease, make sure to share this with the healthcare provider prescribing the medication, as it can affect your liver health.
Pregnant or breastfeeding. Women who are pregnant or breastfeeding should talk to a healthcare professional about using this medication. It can pass through the womb as well as transfer through breast milk.
Drink or consume certain foods. There are also certain foods to avoid when taking Cymbalta — and that’s not including alcohol, which can be a big no-no. If you’re concerned by the food list or drinking risks, talk to a healthcare provider for support and guidance.
Side effects may or may not be a hurdle for you — that’s going to depend on your particular reaction to this medication. But if you’re not sure what to do next — whether duloxetine is going to help or harm — here’s what you need to know:
Living with depression or chronic pain can be miserable. Duloxetine, along with many other prescription medications, may help.
Just because side effects are possible doesn’t make them likely. And even in cases where you experience side effects, they’re often preferable to the symptoms you’re trying to treat.
Your healthcare provider can help you determine if the potential risks are worth the proven benefits — and help get you on the road to brighter days.
If you decide to go off of duloxetine, talk with your healthcare provider about how best to do this. The medication can cause withdrawal symptoms if you stop suddenly, so they may want to slowly wean you off your dosage to minimize these effects.
Our guides include more detailed looks at the benefits of Cymbalta for depression and Cymbalta for anxiety. We also offer virtual mental health services, including online psychiatry and online therapy.
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