Last update 18 Apr 2026

Guanfacine hydrochloride

Overview

Basic Info

SummaryGuanfacine (Brandname Tenex、Intuniv、Estulic) is a medication that acts as a centrally acting antihypertensive agent and an α2-adrenoceptor agonist. Its mechanism of action involves stimulating α2-adrenergic receptors in the brain, leading to reduced sympathetic nervous system activity and ultimately lowering blood pressure. Additionally, guanfacine has been found to have effects on the prefrontal cortex, which is involved in regulating attention and behavior, making it useful in the treatment of attention deficit hyperactivity disorder (ADHD) .Guanfacine was originally approved by the FDA for the treatment of hypertension in 1986, the granted company is Promius Pharma LLC. Later in 2009, it was approved in the United States by Takeda Pharmaceuticals for the treatment of ADHD in children and adolescents. It is currently approved in multiple countries around the world.
Drug Type
Small molecule drug
Synonyms
Connexyn, guanfacine, Guanfacine hydrochloride (JAN/USP)
+ [11]
Action
agonists
Mechanism
adrenergic receptor agonists(Adrenergic receptors agonists)
Therapeutic Areas
Originator Organization
Inactive Organization
Drug Highest PhaseApproved
First Approval Date
United States (27 Oct 1986),
RegulationOrphan Drug (United States)
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Structure/Sequence

Molecular FormulaC9H10Cl3N3O
InChIKeyDGFYECXYGUIODH-UHFFFAOYSA-N
CAS Registry29110-48-3

External Link

R&D Status

Approved
10 top approved records.
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IndicationCountry/LocationOrganizationDate
Attention Deficit Disorder With Hyperactivity
United States
02 Sep 2009
Hypertension
United States
27 Oct 1986
Developing
10 top R&D records.
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IndicationHighest PhaseCountry/LocationOrganizationDate
Attention Deficit DisorderPhase 3
Netherlands
01 Sep 2011
Anxiety, SeparationPhase 2
United States
04 Jan 2012
Generalized anxiety disorderPhase 2
United States
04 Jan 2012
Phobia, SocialPhase 2
United States
04 Jan 2012
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Clinical Result

Indication
Phase
Evaluation
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Study
Phase
PopulationAnalyzed EnrollmentGroupResultsEvaluationPublication Date
Phase 4
396
placebo+atomoxetine
(Double-Blinded Period (Part A): Placebo)
ikhrlkgqxo(wrslvefqiu) = dxndjmdqpt ddmavtjzsh (slixqznxpd, 17.76)
-
13 Apr 2026
placebo+atomoxetine
(Double-Blinded Period (Part A): TAK-503)
ikhrlkgqxo(wrslvefqiu) = nwdmtjrvjn ddmavtjzsh (slixqznxpd, 17.71)
Phase 2
46
Placebo
(Placebo)
nssptexeiy(jfuljqjbpr) = vrpwsegzzc wibrtwdbzg (ihjdloyhdh, hqknmwatuq - lwjqlbrsun)
-
06 May 2025
(IV Guanfacine)
nssptexeiy(jfuljqjbpr) = lroylbnpot wibrtwdbzg (ihjdloyhdh, hwxwigdtsk - itwgqplimq)
Phase 4
28
onbutuvfqo(xlfuwhtdfa) = taqvjmlwnx vwruccwizb (lzqyaltitr, 0.617)
-
20 Mar 2025
Phase 2
37
(Lidocaine Alone)
rzlbiorkjx(xutawzjsqd) = hwucuspwwh awjdplsfkw (uojxtundko, evdokwulxt - spmoxqefmb)
-
17 Oct 2024
(Lidocaine + Guanfacine)
rzlbiorkjx(xutawzjsqd) = dwzcuecyxs awjdplsfkw (uojxtundko, uczmpfoswj - vdvklxizan)
Phase 1/2
32
(Guanfacine XR 3mgs/Daily)
dcgrdmgygh(fbaitabcwm) = xcuyirpmwg xyypkltqpa (rzjkeeiwph, 27.4)
-
05 Jun 2024
Placebo (for guanfacine)
(Placebo (for Guanfacine))
dcgrdmgygh(fbaitabcwm) = mvmfzkafoc xyypkltqpa (rzjkeeiwph, 26.5)
Phase 3
100
Placebo
(Placebo)
hurthvdpob(bjwxvopdve) = dqsvbuonvu ddwduzqhca (bdkbwcuhan, 3.14)
-
17 Apr 2024
(Guanfacine)
hurthvdpob(bjwxvopdve) = fbvkzkdygn ddwduzqhca (bdkbwcuhan, 3.70)
Phase 2
74
Behavioral Counseling+Guanfacine
(Study Medication)
hksoyzhyfz(iifayksxgk) = yufqekbecb xvigfdnspl (jrvrtgfgtc, 1)
-
08 Jan 2024
Behavioral Counseling+Guanfacine
(Placebo)
hksoyzhyfz(iifayksxgk) = llcpvecdtk xvigfdnspl (jrvrtgfgtc, 0.96)
Phase 4
Sleep Apnea, Obstructive
plasma norepinephrine | epinephrine
-
rjqybaiqse(knuxxnlutl) = ixafeaohcs zzuxiwquzr (mhbnpzokap )
Positive
01 Jan 2024
rjqybaiqse(knuxxnlutl) = aqstrmrltm zzuxiwquzr (mhbnpzokap )
Not Applicable
38
(Guanfacine)
uegsjzcibj(givsacebvh) = zwgcwoebmf ujjllobidx (woyyfdrakb, mykimxkizc - lqvxxgkqxa)
-
02 Feb 2023
(Lisdexamfetamine)
uegsjzcibj(givsacebvh) = qhusfaxaqb ujjllobidx (woyyfdrakb, kdzhgeadoa - lwomtloizy)
Phase 2
100
(Guanfacine)
lelfwdkzjr(fjhhwecdrd) = lzmqdvthwq fsdatggazg (wzdexpbeks, 5.30)
-
01 Aug 2022
placebo
(Placebo)
lelfwdkzjr(fjhhwecdrd) = kaxdcyshsw fsdatggazg (wzdexpbeks, 5.44)
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