{"id":634549,"date":"2025-12-26T09:30:53","date_gmt":"2025-12-26T14:30:53","guid":{"rendered":"https:\/\/www.singlecare.com\/blog\/?p=634549"},"modified":"2025-12-10T14:27:54","modified_gmt":"2025-12-10T19:27:54","slug":"does-venlafaxine-cause-weight-gain","status":"publish","type":"post","link":"https:\/\/www.singlecare.com\/blog\/does-venlafaxine-cause-weight-gain\/","title":{"rendered":"Does venlafaxine cause weight gain?"},"content":{"rendered":"

Roughly 11.4% of Americans use a prescription medication to manage mental health conditions like depression and anxiety, according to the CDC. One common side effect of antidepressants is weight gain, affecting approximately 65% of patients.\u00a0<\/span><\/p>\n

Effexor (<\/span>venlafaxine<\/span><\/a>) is an FDA-approved drug used to treat major depressive disorder, panic disorders, and anxiety disorders. While it can cause short-term weight loss, you might experience weight gain, especially with high doses or long-term use.\u00a0<\/span><\/p>\n

Can venlafaxine cause weight gain?<\/span><\/h2>\n

Is it possible to <\/span>gain weight<\/span><\/a> on <\/span>venlafaxine<\/span><\/a>? Yes, especially with long-term use. Venlafaxine is a serotonin-norepinephrine reuptake inhibitor (SNRI). It treats <\/span>depressive disorders<\/span><\/a> by blocking the reabsorption of norepinephrine and serotonin, which increases the availability of these neurotransmitters in the brain.<\/span><\/p>\n

Researchers from Harvard Health note that weight gain is more likely to occur with extended use of venlafaxine. Taking an antidepressant for more than a year can lead to <\/span>weight gain<\/span><\/a> as your serotonin receptors become downregulated (desensitized). As a result, you may experience an increase in cravings and potential changes in your metabolism.<\/span><\/p>\n

A <\/span>cross-sectional study<\/span><\/a> observed 362 patients who were taking an antidepressant drug for 6 to 36 months found that venlafaxine was among the drugs associated with <\/span>weight gain<\/span><\/a>.<\/span><\/p>\n

\u201cHigher dosages of venlafaxine can lead to an increase in desire for more food or comfort\/sweet foods,\u201d explains <\/span>Erika Gray, Pharm.D<\/span><\/a>., founder and chief medical officer at ToolBox <\/span>Genomics.com<\/span><\/a>. \u201cLarger doses can stimulate dopamine pathways, which can cause people to crave more food through changes in their reward pathways.\u201d<\/span><\/p>\n

Is it possible to lose weight on the drug?\u00a0<\/span><\/h3>\n

Also, yes, particularly in the short term. Some patients may experience initial weight loss when starting an SNRI, due to increased satiety (a feeling of fullness). In a small study of 20 patients, researchers found that after one month on venlafaxine, patients experienced modest but statistically significant <\/span>weight loss<\/span><\/a>.\u00a0<\/span><\/p>\n\t\t

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Other factors that influence weight changes<\/span><\/h2>\n

Fluctuations in weight are very personal; that is, there are several reasons you may gain weight on venlafaxine, and someone else may not.<\/span><\/p>\n

\u201cWhile venlafaxine is typically considered to be one of the more \u2018weight-neutral\u2019 SNRIs, meaning it doesn’t directly cause weight gain, being on venlafaxine could theoretically indirectly cause weight gain,\u201d explains <\/span>Saira Bhatti, MD<\/span><\/a>, a psychiatrist based in New York, New York. \u201cAs an example, an individual with untreated depression may have little to no appetite, causing weight loss. Treating the depression by starting venlafaxine may stimulate their appetite as the depression improves and cause weight gain.\u201d<\/span><\/p>\n

In addition, there is a strong link between <\/span>depression and obesity<\/span><\/a>, as people who have depressive disorder are more likely to become obese. Even if you are treating depression with medication, you may still gain weight. This can be due to several factors, including:<\/span><\/p>\n