Treatment of ADHD with Somatic Anxiety

Introduction to Treatment Algorithm

The American Academy of Child and Adolescent Psychiatry recommends starting with Vyvanse (lisdexamfetamine) as first-line treatment for ADHD, even when anxiety is present, as stimulants work rapidly and may indirectly improve anxiety symptoms by reducing ADHD-related functional impairment 1, 2.
The American Academy of Child and Adolescent Psychiatry found that ADHD children with comorbid anxiety actually had increased treatment response differences in the MTA study, contradicting older concerns about stimulants worsening anxiety 1.

Stimulants achieve 70-80% response rates for ADHD and have the largest effect sizes from over 161 randomized controlled trials 2.
If ADHD symptoms improve but somatic anxiety remains problematic, then adding duloxetine is appropriate, as recommended by the American Academy of Child and Adolescent Psychiatry 1, 2.

There are no significant pharmacokinetic interactions between stimulants and SNRIs like duloxetine, making this combination pharmacologically safe 2.
The American Academy of Child and Adolescent Psychiatry explicitly supports adding an SSRI (or by extension, an SNRI) to stimulant regimens when anxiety persists after ADHD treatment 1, 2.
Both medications can be safely combined with appropriate monitoring for blood pressure, pulse, and treatment-emergent side effects 2.

Start lisdexamfetamine at 20-30 mg daily and titrate by 10-20 mg weekly up to 70 mg daily maximum based on ADHD symptom response, as recommended by the American Academy of Child and Adolescent Psychiatry 2.
Monitor for appetite suppression, sleep disturbances, and cardiovascular effects during titration 2.

Monitor blood pressure and pulse at baseline and regularly during treatment with both medications, as recommended by the American Academy of Child and Adolescent Psychiatry 2.
Monitor weight and appetite, as both medications can affect these parameters 2.

Do not assume duloxetine alone will treat both ADHD and anxiety adequately, as the evidence shows no single antidepressant effectively treats both conditions, according to the American Academy of Child and Adolescent Psychiatry 1, 2.
Avoid starting both medications simultaneously, as this prevents determining which medication is responsible for benefits or side effects, as recommended by the American Academy of Child and Adolescent Psychiatry 1, 2.
Never use MAO inhibitors concurrently with either Vyvanse or duloxetine due to risk of hypertensive crisis 2.
Avoid benzodiazepines for chronic anxiety management in ADHD patients, as they may cause disinhibition and are not appropriate for long-term use 2.

If the patient has predominantly worry/rumination rather than somatic symptoms, an SSRI (fluoxetine or sertraline) would be equally appropriate and may be better tolerated than duloxetine, as recommended by the American College of Physicians 4, 5, 6, 2.
For patients with severe anxiety requiring immediate dual treatment, consider starting both medications together, but this should be reserved for cases where anxiety is severely impairing function, according to the American Academy of Child and Adolescent Psychiatry 1.
Methylphenidate-based stimulants are equally effective alternatives to Vyvanse if lisdexamfetamine is not tolerated, as recommended by the American Academy of Child and Adolescent Psychiatry 2.