Is There a Connection between Trazodone and Weight Gain?

Based on clinical trials and reported side effects, there does appear to be a connection between trazodone and weight gain. Many different side effects have been reported by patients taking the drug, and weight gain did occur in both inpatients and outpatients receiving the treatment. Clinical studies appear to show that weight gain is more likely in patients taking the medicine outside of the hospital, but this may be because the patients are more able to indulge their increased appetites. Even in outpatients, less than one in 20 patients experience weight gain.
Trazodone is an anti-depressant, but the precise mechanism by which it works is not yet known. It is believed to work by blocking serotonin receptors and balancing serotonin levels within the brain. The drug comes as a tablet and is taken between one and three time per day. It does not work in exactly the same way as a selective serotonin reuptake inhibitor (SSRI), but is thought to block the reuptake of serotonin. This means the serotonin is available for the nerves in the brain.
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Clinical trials conducted on the effectiveness of the drug found a link between trazodone and weight gain when compared to a placebo. While weight gain is far from the most common side effects of the drug, both inpatients and outpatients receiving the drug experienced more weight gain compared to the placebo group. The symptom is more likely to occur in outpatients, with over three times the number of patients taking the drug outside the hospital reporting weight gain. One possible explanation is that trazodone causes an increase in appetite, which cannot be completely satisfied on hospital food but can be when the patient is at home.
The precise mechanism by which drugs cause weight loss or weight gain is often not known. For this reason, it is difficult to say why trazodone and weight gain are linked as they appear to be. Some people actually experience weight loss when taking trazodone, because they no longer need to balance the brain’s serotonin levels using food. Many different biochemical processes occur in the brain, and making a chemical change can result in outcomes that are not understood. The link between trazodone and weight gain appears to be one of these.

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