Atomoxetine is a prescription medication indicated to help control impulsive and hyperactive behavior in children and adults with attention-deficit and hyperactivity disorder (ADHD). This medication works by increasing the level of a specific chemical responsible for behavior control--called norepinephrine--within the brain. Atomoxetine is administered orally once or twice daily or as prescribed by your doctor. Before you or your child begin treatment with this medication, discuss atomoxetine side effects with your doctor, pediatrician or pharmacist.
Abdominal Pain and Stomach Upset
Approximately 18 percent of children and adolescent patients taking atomoxetine experienced abdominal pain as a side effect of treatment during clinical trials, reports the U.S. Food and Drug Administration. Nausea and vomiting can also occur during atomoxetine use and can contribute to a decrease in appetite or minor weight loss in certain patients. Adults taking this medication also reported experiencing dry mouth and constipation. Constipation may occur in conjunction with abdominal pain, cramping or bloating. Contact your doctor or pediatrician if stomach-related side effects persist or become worse while using atomoxetine.
Difficulty Sleeping
You can experience difficulty sleeping as a side effect of atomoxetine treatment. This medication stimulates chemicals within your brain, which can cause you to feel energized or restless and may contribute to difficulty falling asleep or staying asleep (insomnia). Conversely, children who take this medication may begin to feel abnormally tired or sleepy. These side effects can make it difficult for your child to pay attention or remain alert during school or while completing homework assignments. Speak with your doctor or pediatrician immediately if fatigue symptoms persist or if you experience mental or mood changes, such as anxiety, depression or hostility.
Dizziness
Episodes of dizziness or lightheadedness can develop as side effects of atomoxetine usage. The FDA reports that approximately 5 percent of child and adolescent patients and 6 percent of adult patients experience dizziness after taking a dose of atomoxetine. If you experience sensations of dizziness or lightheadedness while using atomoxetine, remain seated until this episode passes in order to prevent further injury from stumbling or falling down. Your doctor or pediatrician should be contacted if sensations of dizziness persist or if you experience vision changes or hallucinations while taking this medication.
Urinary or Sexual Changes
Adolescent or adult patients who take atomoxetine can develop urinary or sexual changes as side effects of treatment. You may notice that urination become difficult or painful, warns Medline Plus, an informational medical website provided as a service of the National Institutes of Health. Male patients can experience a decrease in sexual drive or desire (libido), which may be accompanied by difficulty achieving or maintaining an erection (impotence). Female patients may experience more painful or irregular menstrual periods after beginning treatment with atomoxetine. You may also develop hot flashes or sweat more than usual. Contact your doctor if you develop any of these urinary or sexual side effects to ensure that you receive appropriate treatment and care.
Suicidal Thoughts or Behaviors
Children and adolescent patients with ADHD who use atomoxetine may be at an increased risk of experiencing unusual suicidal thoughts, warns Medline Plus. Seek immediate medical care if your child becomes abnormally depressed or exhibits any significant changes in behavior.
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