Atomoxetine-Associated Eyebrow Alopecia in a Girl With Attention-Deficit/Hyperactivity Disorder.

To the Editors:

Atomoxetine, a nonpsychostimulant agent used in the first-line treatment of attention-deficit/hyperactivity disorder (ADHD), increases extracellular synaptic levels of norepinephrine and dopamine by obstructing norepinephrine presynaptic reuptake.[1] It is generally considered to be safe, effective, and well tolerable.[2] Adverse effects may be seen with the clinical use of atomoxetine, including appetite decreased, headache, insomnia, abdominal pain, nausea, vomiting, constipation, dyspepsia, dizziness, somnolence, irritability, mood swings, etc.[3-5] However, an association of eyebrow alopecia with atomoxetine has not been reported. In the present case, we report an 8-year-old girl with ADHD who experienced bilateral eyebrow loss after atomoxetine treatment. To our knowledge, this is the first case of eyebrow alopecia associated with atomoxetine treatment in the literature. Informed consent was signed by parent before case presentation.

CASE REPORT

Because of focusing deficits, distractibility, hyperactivity, and low academic achievement, an 8-year-old girl was referred to our department. The patient was diagnosed with ADHD combined type based on Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, diagnostic criteria and was prescribed atomoxetine (Strattera; Eli Lilly and Company). The girl has a body weight of 22.5 kg. Atomoxetine therapy was initiated at a total daily dose of 12.5 mg for the first and second weeks. No adverse events were observed with atomoxetine at 12.5 mg/d. Then, as the dose increased to 25 mg/d, the symptoms of ADHD were improved. However, at the same time, she developed dizziness (the third week). A week later (the fourth week), her mother reported that she experienced eyebrow loss without observing behavior of hair pulling. Gradually, the eyebrows became increasingly sparse from their initial dense state, but no hair/eyelashes were lost (Fig. 1A). She had no history of alopecia, no dermatological disease, and no previous specific drug reactions. She was not exposed to any other medications, heavy metals, toxins, or stressors while taking atomoxetine. The girl also had no signs of depression or anxiety. Considering the adverse effect of eyebrow loss, the medicine was discontinued. She has done some blood tests, including blood cell count, general biochemistry, thyroid function test, sex hormone test, serum zinc/copper/iron/vitamin B level tests, and autoimmunity-related examination. They were all within the reference range. After 36 days of interruption, the eyebrows returned to their normal state, and no other medications or dietary supplements were given (Fig. 1B). Atomoxetine was reintroduced (25 mg/d) after 50 days of interruption because of ADHD problems. However, this time, no signs of eyebrow alopecia or hair loss were observed, and there was a marked improvement in the clinical symptoms of ADHD.

FIGURE 1

A, Bilateral eyebrow loss after atomoxetine treatment. B, Eyebrows returned to normal state after 36 days of interruption.

DISCUSSION

Eyebrow alopecia can occur as a complication of certain skin conditions, autoimmune disorders, malnutrition, and as an adverse effect of prescription drug use, chemotherapy, heavy metals, or other toxins exposure. The most common type caused by medication is telogen effluvium, which characterized by the thinning or shedding of hair resulting from the early entry of hair in the telogen phase.[6-9] Methylphenidate is a stimulant drug used for the treatment of ADHD. A case of eyebrow loss caused by methylphenidate had been reported.[10] Until now, atomoxetine-associated eyebrow alopecia has never been reported in literature. In our case, we excluded conditions and medications that can cause eyebrow alopecia. After the interruption of atomoxetine, the eyebrow loss event resolved without any other medicine or dietary supplements. Atomoxetine was then reintroduced during a second regular treatment period. However, no significant adverse effects, including eyebrow alopecia, were observed after continued use of atomoxetine. In the treatment period, as no other medicine or dietary supplements were given to the patient, drug tolerance was considered as the primary reason. The exact mechanisms of eyebrow alopecia and drug tolerance are still unknown, but studies showed that adverse effects were noted to be transient, occurring mainly early in atomoxetine treatment and then declining.[11] Clinicians should be aware that eyebrow alopecia is a possible but very rare adverse effect of atomoxetine treatment, and such adverse effects may be tolerable.