Atomoxetine is a norepinephrine reuptake inhibitor used for treatment of attention-deficit/hyperactivity disorder. Prescribing information from the manufacturer lists genitourinary-related adverse events such as urinary hesitancy/retention and priapism as precautions for atomoxetine. We report a case of urinary hesitancy with milky, white-colored discharge associated with atomoxetine use in a 42-year-old male. The onset of genitourinary symptoms occurred within 2 days of atomoxetine 40 mg daily initiation. Laboratories, urinalysis, sexually transmitted infection analysis, and genital examinations were all unremarkable. Within 2 days of atomoxetine discontinuation, the genitourinary symptoms were no longer present. We calculated a Naranjo adverse event score of 5, indicating atomoxetine probably caused the genitourinary adverse events. A review of literature suggests that urine outflow obstruction-related adverse events occur more commonly in men compared to women. Discontinuation of atomoxetine appears to lead to rapid resolution of the adverse events. Additionally, spontaneous ejaculation and sexual side effects rarely occur with atomoxetine. Clinicians should educate and monitor patients explicitly for genitourinary-related adverse events, as they may not be spontaneously reported.
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