All articles
Does Duloxetine (Cymbalta) Cause Weight Gain? What the Research Says
Reading time:
4 min
Author
Dr. Rachel Jecker
Published on
Updated on
Mental health
Ready to transform your health?
Ready to transform your health?
Get expert guidance and a personalized care plan designed around you.
Key Takeaways
Duloxetine (Cymbalta) overall has a moderate risk of long-term weight gain
Duloxetine can cause mild appetite suppression and short term weight loss
Average long-term duloxetine weight gain is ~3 pounds over 1 year
If you’re experiencing significant Cymbalta weight loss or gain, reach out to your healthcare provider to discuss options
Many medications cause weight gain, including some used to treat depression or anxiety. You may have heard some people say antidepressants cause weight gain. The truth is, some antidepressants do lead to weight gain, but others can cause weight loss.
SNRIs (selective serotonin and norepinephrine reuptake inhibitors) are a type of antidepressant, and millions of prescriptions are written for SNRIs each year. Duloxetine, also called Cymbalta, is a common SNRI. It can be used to treat depression as well as nerve pain.
If you’re taking Cymbalta or considering starting it, it’s natural to wonder - Does Cymbalta cause weight gain? For some people it can, but typically only a small amount.
Read on to learn more about duloxetine and weight!
What Studies Show About Duloxetine and Weight
Overall, the data on duloxetine and weight are mixed. Some studies show weight gain of up to 3.5 pounds. (1) Others show around 1.2 lbs of weight loss in the beginning and no weight gain in the long-term. (2) These mixed results can make it difficult to know what the relationship is between duloxetine and weight. In general, reviews of many studies at a time suggest that there is a general association with a small amount of long-term weight gain and being on duloxetine.
However, duloxetine and weight can have a different relationship in the short term versus the long term. In short-term clinical trials over 8-9 weeks, patients taking duloxetine lost just over 1 pound. Longer-term clinical trials looking at duloxetine and weight showed that over a year of treatment with duloxetine, patients had an average weight gain of approximately 3 pounds. (3)
Short-Term vs Long-Term Weight Effects of Duloxetine
In the short term, duloxetine reduces impulsivity. This can help reduce snacking, and thus reduce overall food intake. People may also notice they experience duloxetine appetite changes. You can think of the body’s nervous system as having two settings: a “resting and digesting” setting referred to as parasympathetic, and a more activated setting, referred to as sympathetic. Duloxetine increases sympathetic activity, which prompts the body to focus less on food. This leads people to feel full, reducing food intake. (3)
In the long term, duloxetine can cause a small amount of weight gain. Patients who started at a BMI of less than 25 kg/m2 saw slightly more duloxetine weight gain than those who started at a higher BMI. As the body adjusts to the medication, eating habits return to normal. Long-term use of SNRIs like duloxetine can change the way the body handles the receptors that trigger a feeling of “fullness.” They can be downregulated, which means there are fewer of them being made. Because of this, people can regain the weight they lost and even experience weight gain. (2, 3, 4)
Why Some People Gain Weight on Duloxetine
Duloxetine and weight can have a complex relationship, and some people experience significant weight gain on duloxetine. One study published in 2025 reviewed weight and antidepressant use in over 183,000 patients. The authors found that patients taking duloxetine are 10-15% more likely to gain 5% of their body weight than patients taking another antidepressant, called Zoloft (sertraline). (5)
We don’t know exactly why some people gain weight on duloxetine, but we have a sense of what may indicate someone is at higher risk of duloxetine weight gain. One study of 362 patients found an association between several factors and a risk of weight gain of ≥7% of starting body weight. Those factors included a family history of obesity, a lower starting BMI, and lower education status. (6) For some other medications, like antipsychotics, studies suggest that there is a genetic component to weight gain. (7) We don’t know if there is a genetic component to duloxetine and weight changes.
Duloxetine vs Other Antidepressants for Weight Gain
Some antidepressants very clearly cause weight gain. The antidepressant mirtazapine (Remeron) is associated with increases in weight and body fat, and has even been shown to increase appetite specifically for sweets. It can be used to promote weight gain in patients who are not eating enough to maintain a healthy weight due to depression, cancer, or other factors. (8)
In contrast, other antidepressants can actually be used as part of a treatment regimen for weight management. Bupropion is an antidepressant that is used in combination with naltrexone for weight loss. The combination pill is called Contrave. When used for depression, bupropion is called Wellbutrin. One study showed 67% of patients taking bupropion lost over 5% of their body weight. When the patients with initial weight loss were followed for 6 months, they lost an average of 12.9% of their body weight, and nearly ¾ of what they lost was fat! (9)
Tips to Manage Weight Gain on Duloxetine
Exercise Regularly
Regular physical activity can be a helpful tool in managing duloxetine weight gain. The Department of Health and Human Services recommends moderate or vigorous aerobic activity on a regular basis. For moderate activity like brisk walking, target 150-300 minutes per week. For vigorous activity such as jogging, target 75-150 minutes per week. (10)
If you’re not able to hit those numbers at first, don’t worry! There are many strategies to build exercise into your daily routine. You can try doing squats while waiting for food to cook, parking at the far end of the parking lot, or getting off the bus one stop earlier. Making exercise a social activity can help establish a routine, and social connection can be beneficial for depression as well!
Follow a Balanced Diet
Emphasizing fruits and vegetables is a great starting point, since they are rich in vitamins and can help support good bowel habits by providing fiber. The World Health Organization recommends at least 400 grams (approximately 0.9 lbs) of fruits and vegetables per day. (11)
It can sometimes be tricky to know how many calories you’re eating. Strategies like meal-planning, weighing ingredients, and keeping healthy snack options around can help prevent consumption of unintentional calories.
Consider Weight Loss Medication
If you’re worried about duloxetine weight gain, you may be interested in exploring medication options like compounded semaglutide or other GLP-1s. Overall, GLP-1 medications are safe for depression and anxiety, with some studies even showing a benefit to mental health from GLP-1s. (12)
If you’ve noticed weight gain on duloxetine and want to explore your options, talk to your provider with Mochi.
FAQs
Does duloxetine weight gain go away?
Usually, yes. A balanced diet and regular exercise can help manage weight gain on duloxetine. In some cases, exploring a GLP-1 medication can also be a powerful tool.
Is duloxetine weight neutral?
Overall, duloxetine is associated with a moderate risk of small weight gain. However, each person responds differently to medication, and people can experience either Cymbalta weight loss or gain.
Are duloxetine appetite changes permanent?
No, duloxetine appetite changes usually go away after stopping the medication.
Do all antidepressants cause weight gain?
No, all antidepressants do not cause weight gain. Some, like bupropion, can promote weight loss.
When should I worry about duloxetine and weight?
Whenever you’re noticing persistent changes in your weight or appetite, it can help to talk to your healthcare provider. They can help build a plan that’s right for you to manage both weight and mental health.
Check Your Eligibility
If you’re wondering if you’re experiencing duloxetine weight gain, and what you should do, Mochi Health's telehealth platform can connect you with a provider to help with the next step in your journey! Check your eligibility here.
Disclaimer: This article is for educational purposes only and should not be considered medical advice. The information provided does not constitute recommendations for treatment. Always consult with your healthcare provider about your specific situation, symptoms, and treatment options.
References
Blumenthal, S. R., Castro, V. M., Clements, C. C., Rosenfield, H. R., Murphy, S. N., Fava, M., Weilburg, J. B., Erb, J. L., Churchill, S. E., Kohane, I. S., Smoller, J. W., & Perlis, R. H. (2014). An electronic health records study of long-term weight gain following antidepressant use. JAMA Psychiatry, 71(8), 889. https://doi.org/10.1001/jamapsychiatry.2014.414
Wise, T. N., Perahia, D. G., Pangallo, B. A., Losin, W. G., & Wiltse, C. G. (2006). Effects of the antidepressant duloxetine on body weight: analyses of 10 clinical studies. Primary care companion to the Journal of clinical psychiatry, 8(5), 269–278. https://doi.org/10.4088/pcc.v08n0503
Gill, H., Gill, B., El‐Halabi, S., Chen‐Li, D., Lipsitz, O., Rosenblat, J. D., Van Rheenen, T. E., Rodrigues, N. B., Mansur, R. B., Majeed, A., Lui, L. M., Nasri, F., Lee, Y., & Mcintyre, R. S. (2020). Antidepressant medications and weight change: A narrative review. Obesity, 28(11), 2064–2072. https://doi.org/10.1002/oby.22969
Mouawad, M., Nabipur, L., & K. Agrawal, D. (2025). Impact of antidepressants on weight gain: Underlying mechanisms and mitigation strategies. Archives of Clinical and Biomedical Research, 9(3). https://doi.org/10.26502/acbr.50170450
Petimar, J., Young, J. G., Yu, H., Rifas-Shiman, S. L., Daley, M. F., Heerman, W. J., Janicke, D. M., Jones, W. S., Lewis, K. H., Lin, P. D., Prentice, C., Merriman, J. W., Toh, S., & Block, J. P. (2024). Medication-Induced Weight Change Across Common Antidepressant Treatments : A Target Trial Emulation Study. Annals of internal medicine, 177(8), 993–1003. https://doi.org/10.7326/M23-2742
Uguz, F., Sahingoz, M., Gungor, B., Aksoy, F., & Askin, R. (2015). Weight gain and associated factors in patients using newer antidepressant drugs. General Hospital Psychiatry, 37(1), 46–48. https://doi.org/10.1016/j.genhosppsych.2014.10.011
Kao, A. C., & Müller, D. J. (2013). Genetics of antipsychotic-induced weight gain: Update and current perspectives. Pharmacogenomics, 14(16), 2067–2083. https://doi.org/10.2217/pgs.13.207
Riechelmann, R. P., Burman, D., Tannock, I. F., Rodin, G., & Zimmermann, C. (2009). Phase II trial of Mirtazapine for cancer-related cachexia and anorexia. American Journal of Hospice and Palliative Medicine, 27(2), 106–110. https://doi.org/10.1177/1049909109345685
Gadde, K. M., Parker, C. B., Maner, L. G., Wagner, H. R., 2nd, Logue, E. J., Drezner, M. K., & Krishnan, K. R. (2001). Bupropion for weight loss: an investigation of efficacy and tolerability in overweight and obese women. Obesity research, 9(9), 544–551. https://doi.org/10.1038/oby.2001.71
U.S. Department of Health and Human Services. (2018). Physical Activity Guidelines for Americans 2nd Edition. https://odphp.health.gov/sites/default/files/2019-09/Physical_Activity_Guidelines_2nd_edition.pdf
World Health Organization. (2026, January 26). Healthy diet. World Health Organization. https://www.who.int/news-room/fact-sheets/detail/healthy-diet
Kim, Y.-K., Kim, O. Y., & Song, J. (2020). Alleviation of depression by glucagon-like peptide 1 through the regulation of neuroinflammation, neurotransmitters, neurogenesis, and synaptic function. Frontiers in Pharmacology, 11. https://doi.org/10.3389/fphar.2020.01270
Key Takeaways
Duloxetine (Cymbalta) overall has a moderate risk of long-term weight gain
Duloxetine can cause mild appetite suppression and short term weight loss
Average long-term duloxetine weight gain is ~3 pounds over 1 year
If you’re experiencing significant Cymbalta weight loss or gain, reach out to your healthcare provider to discuss options
Many medications cause weight gain, including some used to treat depression or anxiety. You may have heard some people say antidepressants cause weight gain. The truth is, some antidepressants do lead to weight gain, but others can cause weight loss.
SNRIs (selective serotonin and norepinephrine reuptake inhibitors) are a type of antidepressant, and millions of prescriptions are written for SNRIs each year. Duloxetine, also called Cymbalta, is a common SNRI. It can be used to treat depression as well as nerve pain.
If you’re taking Cymbalta or considering starting it, it’s natural to wonder - Does Cymbalta cause weight gain? For some people it can, but typically only a small amount.
Read on to learn more about duloxetine and weight!
What Studies Show About Duloxetine and Weight
Overall, the data on duloxetine and weight are mixed. Some studies show weight gain of up to 3.5 pounds. (1) Others show around 1.2 lbs of weight loss in the beginning and no weight gain in the long-term. (2) These mixed results can make it difficult to know what the relationship is between duloxetine and weight. In general, reviews of many studies at a time suggest that there is a general association with a small amount of long-term weight gain and being on duloxetine.
However, duloxetine and weight can have a different relationship in the short term versus the long term. In short-term clinical trials over 8-9 weeks, patients taking duloxetine lost just over 1 pound. Longer-term clinical trials looking at duloxetine and weight showed that over a year of treatment with duloxetine, patients had an average weight gain of approximately 3 pounds. (3)
Short-Term vs Long-Term Weight Effects of Duloxetine
In the short term, duloxetine reduces impulsivity. This can help reduce snacking, and thus reduce overall food intake. People may also notice they experience duloxetine appetite changes. You can think of the body’s nervous system as having two settings: a “resting and digesting” setting referred to as parasympathetic, and a more activated setting, referred to as sympathetic. Duloxetine increases sympathetic activity, which prompts the body to focus less on food. This leads people to feel full, reducing food intake. (3)
In the long term, duloxetine can cause a small amount of weight gain. Patients who started at a BMI of less than 25 kg/m2 saw slightly more duloxetine weight gain than those who started at a higher BMI. As the body adjusts to the medication, eating habits return to normal. Long-term use of SNRIs like duloxetine can change the way the body handles the receptors that trigger a feeling of “fullness.” They can be downregulated, which means there are fewer of them being made. Because of this, people can regain the weight they lost and even experience weight gain. (2, 3, 4)
Why Some People Gain Weight on Duloxetine
Duloxetine and weight can have a complex relationship, and some people experience significant weight gain on duloxetine. One study published in 2025 reviewed weight and antidepressant use in over 183,000 patients. The authors found that patients taking duloxetine are 10-15% more likely to gain 5% of their body weight than patients taking another antidepressant, called Zoloft (sertraline). (5)
We don’t know exactly why some people gain weight on duloxetine, but we have a sense of what may indicate someone is at higher risk of duloxetine weight gain. One study of 362 patients found an association between several factors and a risk of weight gain of ≥7% of starting body weight. Those factors included a family history of obesity, a lower starting BMI, and lower education status. (6) For some other medications, like antipsychotics, studies suggest that there is a genetic component to weight gain. (7) We don’t know if there is a genetic component to duloxetine and weight changes.
Duloxetine vs Other Antidepressants for Weight Gain
Some antidepressants very clearly cause weight gain. The antidepressant mirtazapine (Remeron) is associated with increases in weight and body fat, and has even been shown to increase appetite specifically for sweets. It can be used to promote weight gain in patients who are not eating enough to maintain a healthy weight due to depression, cancer, or other factors. (8)
In contrast, other antidepressants can actually be used as part of a treatment regimen for weight management. Bupropion is an antidepressant that is used in combination with naltrexone for weight loss. The combination pill is called Contrave. When used for depression, bupropion is called Wellbutrin. One study showed 67% of patients taking bupropion lost over 5% of their body weight. When the patients with initial weight loss were followed for 6 months, they lost an average of 12.9% of their body weight, and nearly ¾ of what they lost was fat! (9)
Tips to Manage Weight Gain on Duloxetine
Exercise Regularly
Regular physical activity can be a helpful tool in managing duloxetine weight gain. The Department of Health and Human Services recommends moderate or vigorous aerobic activity on a regular basis. For moderate activity like brisk walking, target 150-300 minutes per week. For vigorous activity such as jogging, target 75-150 minutes per week. (10)
If you’re not able to hit those numbers at first, don’t worry! There are many strategies to build exercise into your daily routine. You can try doing squats while waiting for food to cook, parking at the far end of the parking lot, or getting off the bus one stop earlier. Making exercise a social activity can help establish a routine, and social connection can be beneficial for depression as well!
Follow a Balanced Diet
Emphasizing fruits and vegetables is a great starting point, since they are rich in vitamins and can help support good bowel habits by providing fiber. The World Health Organization recommends at least 400 grams (approximately 0.9 lbs) of fruits and vegetables per day. (11)
It can sometimes be tricky to know how many calories you’re eating. Strategies like meal-planning, weighing ingredients, and keeping healthy snack options around can help prevent consumption of unintentional calories.
Consider Weight Loss Medication
If you’re worried about duloxetine weight gain, you may be interested in exploring medication options like compounded semaglutide or other GLP-1s. Overall, GLP-1 medications are safe for depression and anxiety, with some studies even showing a benefit to mental health from GLP-1s. (12)
If you’ve noticed weight gain on duloxetine and want to explore your options, talk to your provider with Mochi.
FAQs
Does duloxetine weight gain go away?
Usually, yes. A balanced diet and regular exercise can help manage weight gain on duloxetine. In some cases, exploring a GLP-1 medication can also be a powerful tool.
Is duloxetine weight neutral?
Overall, duloxetine is associated with a moderate risk of small weight gain. However, each person responds differently to medication, and people can experience either Cymbalta weight loss or gain.
Are duloxetine appetite changes permanent?
No, duloxetine appetite changes usually go away after stopping the medication.
Do all antidepressants cause weight gain?
No, all antidepressants do not cause weight gain. Some, like bupropion, can promote weight loss.
When should I worry about duloxetine and weight?
Whenever you’re noticing persistent changes in your weight or appetite, it can help to talk to your healthcare provider. They can help build a plan that’s right for you to manage both weight and mental health.
Check Your Eligibility
If you’re wondering if you’re experiencing duloxetine weight gain, and what you should do, Mochi Health's telehealth platform can connect you with a provider to help with the next step in your journey! Check your eligibility here.
Disclaimer: This article is for educational purposes only and should not be considered medical advice. The information provided does not constitute recommendations for treatment. Always consult with your healthcare provider about your specific situation, symptoms, and treatment options.
References
Blumenthal, S. R., Castro, V. M., Clements, C. C., Rosenfield, H. R., Murphy, S. N., Fava, M., Weilburg, J. B., Erb, J. L., Churchill, S. E., Kohane, I. S., Smoller, J. W., & Perlis, R. H. (2014). An electronic health records study of long-term weight gain following antidepressant use. JAMA Psychiatry, 71(8), 889. https://doi.org/10.1001/jamapsychiatry.2014.414
Wise, T. N., Perahia, D. G., Pangallo, B. A., Losin, W. G., & Wiltse, C. G. (2006). Effects of the antidepressant duloxetine on body weight: analyses of 10 clinical studies. Primary care companion to the Journal of clinical psychiatry, 8(5), 269–278. https://doi.org/10.4088/pcc.v08n0503
Gill, H., Gill, B., El‐Halabi, S., Chen‐Li, D., Lipsitz, O., Rosenblat, J. D., Van Rheenen, T. E., Rodrigues, N. B., Mansur, R. B., Majeed, A., Lui, L. M., Nasri, F., Lee, Y., & Mcintyre, R. S. (2020). Antidepressant medications and weight change: A narrative review. Obesity, 28(11), 2064–2072. https://doi.org/10.1002/oby.22969
Mouawad, M., Nabipur, L., & K. Agrawal, D. (2025). Impact of antidepressants on weight gain: Underlying mechanisms and mitigation strategies. Archives of Clinical and Biomedical Research, 9(3). https://doi.org/10.26502/acbr.50170450
Petimar, J., Young, J. G., Yu, H., Rifas-Shiman, S. L., Daley, M. F., Heerman, W. J., Janicke, D. M., Jones, W. S., Lewis, K. H., Lin, P. D., Prentice, C., Merriman, J. W., Toh, S., & Block, J. P. (2024). Medication-Induced Weight Change Across Common Antidepressant Treatments : A Target Trial Emulation Study. Annals of internal medicine, 177(8), 993–1003. https://doi.org/10.7326/M23-2742
Uguz, F., Sahingoz, M., Gungor, B., Aksoy, F., & Askin, R. (2015). Weight gain and associated factors in patients using newer antidepressant drugs. General Hospital Psychiatry, 37(1), 46–48. https://doi.org/10.1016/j.genhosppsych.2014.10.011
Kao, A. C., & Müller, D. J. (2013). Genetics of antipsychotic-induced weight gain: Update and current perspectives. Pharmacogenomics, 14(16), 2067–2083. https://doi.org/10.2217/pgs.13.207
Riechelmann, R. P., Burman, D., Tannock, I. F., Rodin, G., & Zimmermann, C. (2009). Phase II trial of Mirtazapine for cancer-related cachexia and anorexia. American Journal of Hospice and Palliative Medicine, 27(2), 106–110. https://doi.org/10.1177/1049909109345685
Gadde, K. M., Parker, C. B., Maner, L. G., Wagner, H. R., 2nd, Logue, E. J., Drezner, M. K., & Krishnan, K. R. (2001). Bupropion for weight loss: an investigation of efficacy and tolerability in overweight and obese women. Obesity research, 9(9), 544–551. https://doi.org/10.1038/oby.2001.71
U.S. Department of Health and Human Services. (2018). Physical Activity Guidelines for Americans 2nd Edition. https://odphp.health.gov/sites/default/files/2019-09/Physical_Activity_Guidelines_2nd_edition.pdf
World Health Organization. (2026, January 26). Healthy diet. World Health Organization. https://www.who.int/news-room/fact-sheets/detail/healthy-diet
Kim, Y.-K., Kim, O. Y., & Song, J. (2020). Alleviation of depression by glucagon-like peptide 1 through the regulation of neuroinflammation, neurotransmitters, neurogenesis, and synaptic function. Frontiers in Pharmacology, 11. https://doi.org/10.3389/fphar.2020.01270
Share this post
Mental health
Dr. Rachel Jecker
More articles
Read next
Weight loss
4 min
Mochi AI Medical Scribe: EHR-Integrated AI Documentation
Daniel Gildenhuys
Weight loss
4 min
Mochi AI Medical Scribe: EHR-Integrated AI Documentation
Daniel Gildenhuys
Weight loss
4 min
AI Medical Scribe: A Doctor's Review
Dr. Roberto Valledor
Weight loss
4 min
AI Medical Scribe: A Doctor's Review
Dr. Roberto Valledor
Weight loss
4 min
CGM for Non-Diabetics: Glucose Monitoring & GLP-1 Weight Loss
Dr. Roberto Valledor
Weight loss
4 min
CGM for Non-Diabetics: Glucose Monitoring & GLP-1 Weight Loss
Dr. Roberto Valledor
For iOS & Android
Start with care designed for you
Start with care designed for you
+42 treatments available
What can we help you with?
What can we help you with?
Personalized care for long-term wellness
Small wins add up to big transformations. Mochi reminds us to focus on what’s good and use it to build the life we envision.
All professional medical services are provided by licensed physicians and clinicians affiliated with independently owned and operated professional practices. Mochi Health Corp. provides administrative and technology services to affiliated medical practices it supports, and does not provide any professional medical services itself.
Personalized care for long-term wellness
Small wins add up to big transformations. Mochi reminds us to focus on what’s good and use it to build the life we envision.
All professional medical services are provided by licensed physicians and clinicians affiliated with independently owned and operated professional practices. Mochi Health Corp. provides administrative and technology services to affiliated medical practices it supports, and does not provide any professional medical services itself.
Personalized care for long-term wellness
Small wins add up to big transformations. Mochi reminds us to focus on what’s good and use it to build the life we envision.
All professional medical services are provided by licensed physicians and clinicians affiliated with independently owned and operated professional practices. Mochi Health Corp. provides administrative and technology services to affiliated medical practices it supports, and does not provide any professional medical services itself.
Personalized care for long-term wellness
Small wins add up to big transformations. Mochi reminds us to focus on what’s good and use it to build the life we envision.
All professional medical services are provided by licensed physicians and clinicians affiliated with independently owned and operated professional practices. Mochi Health Corp. provides administrative and technology services to affiliated medical practices it supports, and does not provide any professional medical services itself.