In a child with a tic disorder (Tourette syndrome) and ADHD who has not improved on guanfacine, what are the recommended next treatment options?

Treatment Recommendation for Tic Disorder with Co-occurring ADHD Not Improved on Guanfacine

Switch to a stimulant medication (methylphenidate or amphetamine) as the next treatment option, as stimulants are the recommended first-line pharmacotherapy for ADHD in patients with tic disorders and do not worsen tics in most patients. 1

Rationale for Stimulant Therapy

The most recent evidence (2022) clearly establishes that stimulants are the recommended first-line pharmacotherapy to treat ADHD symptoms in patients with tic disorders 1. This represents a significant shift from historical concerns about stimulants worsening tics. Multiple studies demonstrate that:

• Methylphenidate effectively treats ADHD symptoms in children with comorbid tic disorders 2
• Tic symptoms actually improved in children treated with methylphenidate in controlled trials 2
• The long-standing fear of stimulants worsening tics has not been supported by evidence in most patients 2

Alternative Options if Stimulants Are Contraindicated

If stimulants cannot be used or are ineffective, consider these alternatives in order:

1. Atomoxetine (First Alternative)

• Excellent option to treat both ADHD and tics simultaneously 1
• Reduces ADHD symptoms in children with tics 2
• Does not carry the risk of tic exacerbation

2. Clonidine (Second Alternative)

• Has Level A evidence for treating TS with comorbid ADHD 3
• Can be added to stimulants if tics increase, or used as monotherapy to target both ADHD and tics 1
• Improved both ADHD symptoms and tic severity in controlled trials 2
• Considered first-line treatment when taking risk-benefit profile into account 3

3. Combination Therapy

• Methylphenidate plus clonidine showed efficacy for both conditions 2
• α-agonists can be added to stimulants if tics increase 1

If Tics Remain the Primary Problem

If ADHD symptoms improve but tics worsen or remain severe, consider adding:

Aripiprazole - The preferred antipsychotic with the most favorable adverse effect profile 4. European guidelines (2022) identify aripiprazole as the drug of first choice for tic treatment in both children and adults 4.

Critical Caveats

• Individual variation exists: While most patients do not experience tic worsening with stimulants, individual cases may occur 2. Monitor closely during titration.
• High-dose dextroamphetamine appeared to worsen tics in one study, though this was limited 2. Start with standard doses.
• Guanfacine failure doesn't predict other α-agonist failure: Clonidine has stronger evidence (Level A) than guanfacine for this specific population 3

Treatment Algorithm

1. First step: Trial methylphenidate (strongest evidence for ADHD with tics)
2. If stimulant worsens tics: Switch to atomoxetine
3. If ADHD persists: Add clonidine to stimulant, or use clonidine monotherapy
4. If tics remain severe: Add aripiprazole to ADHD medication

The 2019 AAP guidelines 5 support adjunctive therapy when stimulants are not fully effective, though they note only extended-release guanfacine and clonidine have FDA approval for adjunctive use with stimulants. However, the tic-specific literature provides stronger guidance for this particular population.