🌿 Guanfacine Alpha-2 Agonist ADHD Simulator

Baseline Prefrontal Network — Weak Alpha-2A Signaling

Under-connected prefrontal circuits reduce working memory and impulse control.

• ~8%: Alpha-2A activation (unmedicated baseline)
• ~22%: PFC connectivity (sparse network state)
• ~31%: WM / impulse score (reduced regulation)
• Alpha-2A: Target receptor (postsynaptic, PFC-enriched)

Why prefrontal connectivity matters

Weak signaling loosens network "tuning" that supports focus.

ADHD and network under-connectivity

Sparse PFC networks correlate with inattention and impulsivity.

Guanfacine — Direct Postsynaptic Alpha-2A Stimulation

Guanfacine directly stimulates alpha-2A receptors, a distinct mechanism.

• Intuniv: Brand name (extended-release guanfacine)
• Alpha-2A agonist: Mechanism class (not a stimulant)
• Different MOA: Vs. atomoxetine (no reuptake blockade)
• Days–weeks: Onset window (gradual titration)

Direct receptor agonism

Guanfacine binds postsynaptic alpha-2A receptors directly in PFC.

Contrast with reuptake inhibitors

Atomoxetine blocks norepinephrine reuptake; guanfacine acts postsynaptically.

Alpha-2A Activation Strengthens Cortical Connections

Receptor activation progressively strengthens prefrontal network connections.

• ~74%: Alpha-2A activation (rising with dose)
• ~61%: PFC connectivity (edges densify)
• HCN channels: Ion channel target (closed by cAMP signaling)
• Increased gain: Network effect (signal-to-noise improves)

Cellular signaling cascade

Alpha-2A activation reduces cAMP, closing HCN channels, sharpening tuning.

Network-level consequence

Stronger synaptic connections raise effective prefrontal connectivity.

Enhanced Connectivity Improves Working Memory and Control

Denser networks translate into better working memory and impulse control.

• ~76%: WM / impulse score (substantial gain)
• ~82%: PFC connectivity (near-dense network)
• Regulation: Behavioral domain (inhibition, attention span)
• Weeks: Timeframe (to full clinical effect)

Working memory circuits

Delay-period neuron firing stabilizes as connectivity strengthens.

Impulse control gains

Stronger top-down PFC control improves behavioral inhibition.

Outcome — Symptom Relief and the Sedation Trade-off

ADHD symptoms improve; sedation often favors evening dosing.

• Improved: ADHD symptom relief (core inattention/impulsivity)
• Tics, ODD: Comorbid benefit (may also improve)
• Sedation: Common side effect (especially daytime dosing)
• Evening: Dosing consideration (reduces daytime sedation impact)

Symptom and comorbidity benefit

Improved attention, impulse control; possible tic/ODD symptom relief.

Sedation and dosing strategy

Evening dosing lessens the practical impact of sedation.