Supplement Scholar
Compound

Guanfacine (Ref)

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Prescription drug or research compound. Use only under the care of a licensed prescriber. Information here is educational and not a recommendation to obtain or use it.

Guanfacine (Ref). α2A-agonist reference drug for prefrontal focus and ADHD.

How it works. Selective postsynaptic α2A-adrenergic agonism strengthens prefrontal network connectivity.

What the research supports. 1 graded claims. Strongest: Improves ADHD symptoms (strong).

How much to take. Typical dose: Rx 1–4 mg/day.

Side effects and interactions. 1 medication interaction listed. Serious: Syncope on abrupt discontinuation.

Stacking. Pairs well with Omega-3 (EPA/DHA), Alpha-GPC or CDP-choline.

Common forms. Available as Capsule or softgel, Powder, Sublingual or buccal, Liposomal liquid.

Key studies. 8 studies cited. The strongest are listed with links to PubMed.

Community. Experiences from people who have tried Guanfacine (Ref). Anecdotes are not medical advice.

Guanfacine (Ref). α2A-agonist reference drug for prefrontal focus and ADHD.

Molecular structureC9H9Cl2N3O · 246.09 g/mol

What it is

α2A-agonist reference drug for prefrontal focus and ADHD.

Food sources

Endogenously produced or biosynthesized moleculeStandardized pharmaceutical- or food-grade supplementCombined with cofactors that improve absorption or activity

Goals

Brain & Cognitive

How it works

Selective postsynaptic α2A-adrenergic agonism strengthens prefrontal network connectivity.

Pathways

  • Selective postsynaptic α2A-adrenergic agonism strengthens prefrontal network connectivity

Effects

  • +ADHD symptoms supports

What the research supports

Improves ADHD symptomsstrong

Strong: consistent results across large trials or meta-analyses. Moderate: several trials, mostly positive. Limited: small or mixed studies. Preclinical: animal or cell research only.

Typical dose
Rx 1–4 mg/day
TimingConsistent daily timing recommended; split larger doses if GI tolerance is a concern.
With foodWith a meal containing fat for fat-soluble compounds; otherwise either.
Best formMost evidence is based on the capsule or softgel form.
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Side effects & interactions

Common side effects

  • Sedation
  • Hypotension

Serious

  • Syncope on abrupt discontinuation

Medication interactions

Prescription medications (general)minor

Always disclose Guanfacine (Ref) use to your prescriber — additive, antagonistic, or pharmacokinetic interactions are possible.

Check any supplement–medication combination with your pharmacist before starting.

Combines with

Pairs well

  • Omega-3 (EPA/DHA)Membrane fluidity and neuronal signaling support.
  • Alpha-GPC or CDP-cholineProvides choline substrate for acetylcholine synthesis.

Common forms

  • Capsule or softgel
  • Powder
  • Sublingual or buccal
  • Liposomal liquid

Key studies

8 studies cited in total.

PubMed: Guanfacine (Ref) — Improves ADHD symptoms ↗
Systematic review · PubMed (NLM) · 2026

Opens current human and preclinical literature matching Guanfacine (Ref) and "Improves ADHD symptoms". Filter by RCT, meta-analysis, or year on the results page.

PubMed: Guanfacine (Ref) — randomized controlled trial ↗
Systematic review · PubMed (NLM) · 2026

Opens current human and preclinical literature matching Guanfacine (Ref) and "randomized controlled trial". Filter by RCT, meta-analysis, or year on the results page.

PubMed: Guanfacine (Ref) — meta-analysis ↗
Systematic review · PubMed (NLM) · 2026

Opens current human and preclinical literature matching Guanfacine (Ref) and "meta-analysis". Filter by RCT, meta-analysis, or year on the results page.

Discussion

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