What is the maximum daily dose of Strattera (atomoxetine) for adults, children (≥6 years), and patients with moderate to severe hepatic impairment?

Maximum Dose for Strattera (Atomoxetine)

The maximum daily dose of Strattera is 100 mg/day for adults and children weighing over 70 kg, or 1.4 mg/kg/day for children and adolescents weighing ≤70 kg, whichever is less. 1

Dosing by Weight and Age

Children and Adolescents ≤70 kg

• Initial dose: 0.5 mg/kg/day 1
• Target dose: 1.2 mg/kg/day 1
• Maximum dose: 1.4 mg/kg/day 1

Children and Adolescents >70 kg and Adults

• Initial dose: 40 mg once daily 1
• Target dose: 80 mg/day 1
• Maximum dose: 100 mg/day 1

Titration Schedule

Maintain the initial dose for at least 7-14 days before increasing to assess tolerability. 2 After this period, increase to 60 mg daily, and if needed, further increase to 80 mg daily. 2 Dose escalations should not occur more frequently than every 7-14 days. 2

• Increase by small increments (typically 10-25 mg) no more frequently than every 1-2 weeks 2
• Slow titration is better tolerated and helps avoid exceeding the optimal dose 2
• Doses above the maximum threshold do not improve efficacy and increase adverse-effect risk 2

Special Populations Requiring Dose Adjustment

Hepatic Impairment

Dosing adjustment is required for patients with hepatic impairment, though specific reduced maximum doses are not detailed in the provided evidence. 1

CYP2D6 Poor Metabolizers or Strong CYP2D6 Inhibitor Use

Dosing adjustment is required for patients who are CYP2D6 poor metabolizers or taking strong CYP2D6 inhibitors. 1

Critical Safety Monitoring

Monitor closely for suicidal ideation, clinical worsening, and unusual behavioral changes, especially during the first few months of treatment or after dose adjustments. 2 This is particularly important given the FDA black box warning for increased suicidal thoughts. 3

Cardiovascular Monitoring

• Obtain baseline blood pressure, heart rate, height, and weight 2
• Monitor these parameters at all follow-up visits 2
• Be aware that modest increases in heart rate and blood pressure can occur 4, 5

Behavioral Activation Risk

• Behavioral activation/agitation (motor or mental restlessness, insomnia, impulsiveness, aggression) can occur early in treatment or with dose increases 2
• Younger patients may be more susceptible to these effects with rapid dose increases 2
• If side effects occur, consider returning to the previous well-tolerated dose 2

Common Pitfalls

Real-world data show that adult patients frequently receive suboptimal dosing, with an average dose of approximately 60 mg/day rather than the recommended 80 mg/day target. 6 This underdosing may be associated with poor patient outcomes. 6

• Set appropriate patient expectations: atomoxetine requires 6-12 weeks to achieve full therapeutic effect, unlike stimulants which work within hours 2
• Keep patients at target dose for an adequate length of time (4-6 weeks) prior to judging efficacy 6
• Common adverse effects include nausea, vomiting, fatigue, decreased appetite, abdominal pain, and somnolence 2