However, one of the less-talked-about benefits of Xeljanz is its potential to cause weight gain. In a 2018 study conducted at Columbia University, patients taking Xeljanz experienced an average 8% increase in body weight over the course of two years. As the authors of the study pointed out, this can be an extremely beneficial effect for those affected by rheumatoid or psoriatic arthritis, as underweight patients often have an impaired immune response and increased inflammation. What’s more, many of the drugs used to treat these conditions can cause weight loss, which can result in further medical complications. For these patients, the weight gain associated with Xeljanz can be a
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