<unk> , sold under the brand name Tenex among others, is an oral medication used to treat attention deficit hyperactivity disorder (ADHD) and high blood pressure. It is not considered a first-line treatment for either indication. Common side effects include sleepiness, constipation, dry mouth, sexual problems, and headaches. Other side effects may include anxiety, low blood pressure, depression, and urinary problems. Use is not recommended during pregnancy or breastfeeding. It appears to work by activating the α2A receptors in the brain thereby decreasing sympathetic nervous system activity.<unk>  was approved for medical use in the United States in 1986. It is available as a generic medication. In 2019, it was the 140th most commonly prescribed medication in the United States, with more than 4million prescriptions.
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