<unk> , sold under the brand names Trintellix and Brintellix among others, is a medication used to treat major depressive disorder. Effectiveness is viewed as similar to that of other antidepressants. In the United Kingdom, it is only recommended in people who have not improved sufficiently on two other antidepressants. It is taken by mouth. Common side effects include nausea, vomiting, constipation, and sexual dysfunction. Serious side effects may include suicide in those under the age of 25, serotonin syndrome, bleeding, mania, and SIADH. A withdrawal syndrome may occur if the dose is rapidly decreased. Use during pregnancy and breastfeeding is not generally recommended. It is classified as a serotonin modulator and stimulator. How it works is not entirely clear but is believed to be related to increasing serotonin levels and possibly interacting with certain receptors for serotonin. It was approved for medical use in the United States in 2013. In 2017, it was the 312th most commonly prescribed medication in the United States, with more than one million prescriptions.
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