This drug entry is a stub and has not been fully annotated. It is scheduled to be annotated soon.



Moxonidine is an imidazoline/α-2 receptor agonist used to treat hypertension, especially in cases where ACE inhibitors, β-blockers, calcium channel blockers, and thiazides are not appropriate or provide inadequate blood pressure control.

Generic Name
DrugBank Accession Number

Moxonidine is a new-generation centrally acting antihypertensive drug approved for the treatment of mild to moderate essential hypertension. It is suggested to be effective in cases where other agents such as thiazides, beta-blockers, ACE inhibitors, and calcium channel blockers are not appropriate or irresponsive. As well, moxonidine has been shown to present blood pressure-independent beneficial effects on insulin resistance syndrome.

Small Molecule
Approved, Investigational
Average: 241.677
Monoisotopic: 241.073037738
Chemical Formula
  • (2R,4R)-1-[(2S)-5-[(aminoiminomethyl)amino]-1-oxo-2-[[(1,2,3,4-tetrahydro-3-methyl-8- quinolinyl)sulfonyl]amino]pentyl]-4-methyl-2-piperidinecarboxylic acid
  • Moxonidina
  • Moxonidine
  • Moxonidinum
External IDs
  • BDF-5896
  • BDF5896
  • BE 5895
  • BE5895
  • LY-326869
  • LY326869



For the treatment of mild to moderate essential or primary hypertension 7. Effective as most first-line antihypertensives when used as monotherapy 2.

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Associated Conditions
Contraindications & Blackbox Warnings
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Antihypertensive agent whose site of action is the Central Nervous System (CNS), specifically involving interactions with I1- imidazoline and alpha-2-adrenergic rececptors within the rostral ventrolateral medulla (RSV). Label

Mechanism of action

Stimulation of central alpha 2-adrenergic receptors is associated with sympathoadrenal suppression and subsequent reduction of blood pressure. As this class was further explored it was discovered that sympathoadrenal activity can also be suppressed by a second pathway with a newly discovered drug target specific to imidazolines 5. Specifically, moxonidine binds the imidazoline receptor subtype 1 (I1) and to a lesser extent αlpha-2-adrenoreceptors in the RSV causing a reduction of sympathetic activity, reducing systemic vascular resistance and thus arterial blood pressure. Label

Moreover, since alpha-2-adrenergic receptors are considered the primary molecular target that facilitates the most common side effects of sedation and dry mouth that are elicited by most centrally acting antihypertensives, moxonidine differs from these other centrally acting antihypertensives by demonstrating only low affinity for central alpha-2-adrenoceptors compared to the aforementioned I1-imidazoline receptors Label.

AAlpha-2A adrenergic receptor

90% of an oral dose is absorbed with negligible interference from food intake or first pass metabolism, resulting in a high bioavailability of 88%. Label

Volume of distribution

1.8±0.4L/kg. Label

Protein binding

About 10% of moxonidine is bound to plasma proteins. Label


Biotransformation is unimportant 3 with 10-20% of moxonidine undergoing oxidation reactions to the primary 4,5-dehydromoxonidine metabolite and a guanidine derivative by opening of the imidazoline ring. Label

The antihypertensive effects of these 4,5-dehydromoxonidine and guanidine metabolites are only 1/10 and 1/100 the effect of moxonidine Label.

Oxidation on either the methyl group (pyrimidine ring) or on the imidazole ring of moxonidine results in the formation of the hydroxylmethyl moxonidine metabolite or the hydroxy moxonidine metabolite 6. The hydroxy moxonidine metabolite can be further oxidized to the dihydroxy metabolite or it can lose water to form the dehydrogenated moxonidine metabolite, which itself can be further oxidized to form an N-oxide 6. Aside from these Phase I metabolites, Phase II metabolism of moxonidine is also evident with the presence of a cysteine conjugate metabolite minus chlorine 6. Nevertheless, the identification of the hydroxy moxonidine metabolite with a high level of dehydrogenated moxonidine metabolite in human urine samples suggests that dehydrogenation from the hydroxy metabolite to the dehydrogenated moxonidine metabolite represents the primary metabolic pathway in humans 6.

The cytochromes P450 responsible for the metabolism of moxonidine in humans have not yet been determined 6.

Ultimately, the parent moxonidine compound was observed to be the most abundant component in different biological matrices of urinary excretion samples, verifying that metabolism only plays a modest role in the clearance of moxonidine in humans 6.

Route of elimination

Elimination is nearly entirely via the kidneys with a majority (50 -75%) of overall moxonidine being eliminated unchanged through renal excretion. Ultimately, more than 90% of a dose is eliminated by way of the kidneys within the first 24 hours after administration, with only approximately 1% being eliminiated via faeces. Label


Plasma elimination half life is 2.2 - 2.3 hours while renal elimination half life is 2.6-2.8 hours. Label


Administered twice daily due to short half life Label.

However, lower dosage adjustments and close monitoring is necessary in elderly and renal impairment patients due to reduced clearance. In particular, the exposure AUC can increase by about 50% following a single dose and at steady state in elderly patients and moderately impaired renal function with GFR between 30-60 mL/min can cause AUC increases by 85% and decreases in clearence to 52 %. Label

Adverse Effects
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  • Contraindicated due to known hypersensitivity to an ingredient (Physiotens tablets contain lactose), heart failure, severe renal impairment, < 16 years old, >75 years old, bradycardia, severe bradyarrhythmia, sick sinus syndrome, second or third degree atrioventricular block, malignant arrhythmias. Label
  • Used with caution in patients with history of severe coronary artery disease (CAD), unstable angina, angioneurotic edema. Label
  • Pregnancy Category B3:Avoid use during pregnancy (inadequate data in pregnant woman) and lactation (maternal blood stream transfer to breast milk shown) unless benefit clearly justifies risk. Label
  • Lack of specific therapeutic experience in cases of intermittent claudication, Raynaud's disease, Parkinson's disease, epileptic disorders, gluacoma, and depression suggest moxonidine should not be used in such instances Label.
  • Carcinogenicity and genotoxicity does not appear significant. Label
  • Concurrent administration of other hypotensives or sedative and hypnotics can enhance the hypotensive effect and intensify sedation respectively. Label
  • Avoid concurrent Tricyclic Antidepressant (TCA) use to avoid reduction of monoxidine efficacy. Label
  • Generally well tolerated with dry mouth and headache the most common adverse effects Label
  • Symptoms of overdose correlate with pharmacodynamic properties:hypotension, sedation, orthostatic dysregulation, bradycardia, dry mouth with no specific counter-treatment known. Label
Not Available
Pharmacogenomic Effects/ADRs
Not Available


Drug Interactions
This information should not be interpreted without the help of a healthcare provider. If you believe you are experiencing an interaction, contact a healthcare provider immediately. The absence of an interaction does not necessarily mean no interactions exist.
AbaloparatideThe risk or severity of adverse effects can be increased when Abaloparatide is combined with Moxonidine.
AcebutololThe therapeutic efficacy of Moxonidine can be decreased when used in combination with Acebutolol.
AceclofenacThe therapeutic efficacy of Moxonidine can be decreased when used in combination with Aceclofenac.
AcemetacinThe therapeutic efficacy of Moxonidine can be decreased when used in combination with Acemetacin.
Acetylsalicylic acidAcetylsalicylic acid may decrease the antihypertensive activities of Moxonidine.
AclidiniumThe risk or severity of Tachycardia can be increased when Aclidinium is combined with Moxonidine.
AdenosineThe risk or severity of Tachycardia can be increased when Adenosine is combined with Moxonidine.
AlclofenacThe therapeutic efficacy of Moxonidine can be decreased when used in combination with Alclofenac.
AldesleukinThe risk or severity of adverse effects can be increased when Aldesleukin is combined with Moxonidine.
AlfentanilAlfentanil may decrease the antihypertensive activities of Moxonidine.
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Food Interactions
Not Available


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Product Ingredients
IngredientUNIICASInChI Key
Moxonidine hydrochloride5RYW07SK5E75438-58-3ZZPAWQYZQVUVHX-UHFFFAOYSA-N
International/Other Brands
Cynt / Physiotens (Solvay Pharmaceuticals)
Unapproved/Other Products
NameIngredientsDosageRouteLabellerMarketing StartMarketing EndRegionImage
PHYSIOTENS 0,2 MG FILM TABLET, 28 ADETMoxonidine (0.2 mg)Tablet, film coatedOralABBOTT LABORATUARLARI İTHALAT İHRACAT VE TİC. LTD. ŞTİ.2020-08-14Not applicableTurkey flag
PHYSIOTENS 0,4 MG FILM TABLET, 28 ADETMoxonidine (0.4 mg)Tablet, film coatedOralABBOTT LABORATUARLARI İTHALAT İHRACAT VE TİC. LTD. ŞTİ.2020-08-14Not applicableTurkey flag


ATC Codes
C02AC05 — MoxonidineC02LC05 — Moxonidine and diuretics
Drug Categories
Chemical TaxonomyProvided by Classyfire
This compound belongs to the class of organic compounds known as halopyrimidines. These are aromatic compounds containing a halogen atom linked to a pyrimidine ring. Pyrimidine is a 6-membered ring consisting of four carbon atoms and two nitrogen centers at the 1- and 3- ring positions.
Organic compounds
Super Class
Organoheterocyclic compounds
Sub Class
Pyrimidines and pyrimidine derivatives
Direct Parent
Alternative Parents
Aminopyrimidines and derivatives / Alkyl aryl ethers / Aryl chlorides / Imidazolines / Heteroaromatic compounds / Guanidines / Propargyl-type 1,3-dipolar organic compounds / Carboximidamides / Azacyclic compounds / Organopnictogen compounds
show 2 more
2-imidazoline / Alkyl aryl ether / Aminopyrimidine / Aromatic heteromonocyclic compound / Aryl chloride / Aryl halide / Azacycle / Carboximidamide / Ether / Guanidine
show 12 more
Molecular Framework
Aromatic heteromonocyclic compounds
External Descriptors
pyrimidines, organohalogen compound (CHEBI:7009)
Affected organisms
  • Humans and other mammals

Chemical Identifiers

CAS number
InChI Key


General References
  1. Cohn JN, Pfeffer MA, Rouleau J, Sharpe N, Swedberg K, Straub M, Wiltse C, Wright TJ: Adverse mortality effect of central sympathetic inhibition with sustained-release moxonidine in patients with heart failure (MOXCON). Eur J Heart Fail. 2003 Oct;5(5):659-67. [Article]
  2. Fenton C, Keating GM, Lyseng-Williamson KA: Moxonidine: a review of its use in essential hypertension. Drugs. 2006;66(4):477-96. [Article]
  3. Prichard BN, Owens CW, Graham BR: Pharmacology and clinical use of moxonidine, a new centrally acting sympatholytic antihypertensive agent. J Hum Hypertens. 1997 Aug;11 Suppl 1:S29-45. [Article]
  4. Prichard BN, Graham BR: I1 imidazoline agonists. General clinical pharmacology of imidazoline receptors: implications for the treatment of the elderly. Drugs Aging. 2000 Aug;17(2):133-59. [Article]
  5. Ernsberger P, Haxhiu MA, Graff LM, Collins LA, Dreshaj I, Grove DL, Graves ME, Schafer SG, Christen MO: A novel mechanism of action for hypertension control: moxonidine as a selective I1-imidazoline agonist. Cardiovasc Drugs Ther. 1994 Mar;8 Suppl 1:27-41. [Article]
  6. He MM, Abraham TL, Lindsay TJ, Schaefer HC, Pouliquen IJ, Payne C, Czeskis B, Shipley LA, Oliver SD, Mitchell MI: Metabolism and disposition of the antihypertensive agent moxonidine in humans. Drug Metab Dispos. 2003 Mar;31(3):334-42. [Article]
  7. Electronic Medicines Compedium Physiotens (Moxonidine) Monograph [Link]
Human Metabolome Database
KEGG Compound
PubChem Compound
PubChem Substance
FDA label
Download (108 KB)
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Clinical Trials

Clinical Trials
4CompletedBasic ScienceCentral Sympathetic Nervous System Diseases1
4CompletedTreatmentAtrial Fibrillation1
4CompletedTreatmentHypertension / Obesity1
4CompletedTreatmentHypertension / Obesity, Abdominal / Syndrome, Metabolic1
4CompletedTreatmentPolycystic Ovarian Syndrome (PCOS)1
4RecruitingTreatmentHypertension / Obesity1
4Unknown StatusNot AvailableBMI >27 kg/m2 / Obesity1
4Unknown StatusTreatmentDiabetic Nephropathy1
4Unknown StatusTreatmentHypertension Arterial / Syndrome, Metabolic1
4Unknown StatusTreatmentHypertension / Obesity, Abdominal1


Not Available
Not Available
Dosage Forms
Tablet, coatedOral0.2 mg
Tablet, coatedOral0.4 mg
Tablet, film coatedOral
Tablet, film coatedOral0.2 MG
Tablet, film coatedOral0.3 MG
Tablet, film coatedOral0.4 MG
Not Available
Not Available


Experimental Properties
melting point (°C)197 – 205MSDS
water solubility<1 mg/mLMSDS
Predicted Properties
Water Solubility0.114 mg/mLALOGPS
pKa (Strongest Basic)7.26Chemaxon
Physiological Charge1Chemaxon
Hydrogen Acceptor Count6Chemaxon
Hydrogen Donor Count2Chemaxon
Polar Surface Area71.43 Å2Chemaxon
Rotatable Bond Count2Chemaxon
Refractivity63.41 m3·mol-1Chemaxon
Polarizability23.57 Å3Chemaxon
Number of Rings2Chemaxon
Rule of FiveYesChemaxon
Ghose FilterYesChemaxon
Veber's RuleNoChemaxon
MDDR-like RuleNoChemaxon
Predicted ADMET Features
Not Available


Mass Spec (NIST)
Not Available
SpectrumSpectrum TypeSplash Key
Predicted GC-MS Spectrum - GC-MSPredicted GC-MSNot Available
Predicted MS/MS Spectrum - 10V, Positive (Annotated)Predicted LC-MS/MSNot Available
Predicted MS/MS Spectrum - 20V, Positive (Annotated)Predicted LC-MS/MSNot Available
Predicted MS/MS Spectrum - 40V, Positive (Annotated)Predicted LC-MS/MSNot Available
Predicted MS/MS Spectrum - 10V, Negative (Annotated)Predicted LC-MS/MSNot Available
Predicted MS/MS Spectrum - 20V, Negative (Annotated)Predicted LC-MS/MSNot Available
Predicted MS/MS Spectrum - 40V, Negative (Annotated)Predicted LC-MS/MSNot Available


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Pharmacological action
General Function
Thioesterase binding
Specific Function
Alpha-2 adrenergic receptors mediate the catecholamine-induced inhibition of adenylate cyclase through the action of G proteins. The rank order of potency for agonists of this receptor is oxymetazo...
Gene Name
Uniprot ID
Uniprot Name
Alpha-2A adrenergic receptor
Molecular Weight
48956.275 Da
  1. Zhu QM, Lesnick JD, Jasper JR, MacLennan SJ, Dillon MP, Eglen RM, Blue DR Jr: Cardiovascular effects of rilmenidine, moxonidine and clonidine in conscious wild-type and D79N alpha2A-adrenoceptor transgenic mice. Br J Pharmacol. 1999 Mar;126(6):1522-30. [Article]
  2. Stone LS, Fairbanks CA, Wilcox GL: Moxonidine, a mixed alpha(2)-adrenergic and imidazoline receptor agonist, identifies a novel adrenergic target for spinal analgesia. Ann N Y Acad Sci. 2003 Dec;1009:378-85. [Article]
  3. Buccafusco JJ, Lapp CA, Westbrooks KL, Ernsberger P: Role of medullary I1-imidazoline and alpha 2-adrenergic receptors in the antihypertensive responses evoked by central administration of clonidine analogs in conscious spontaneously hypertensive rats. J Pharmacol Exp Ther. 1995 Jun;273(3):1162-71. [Article]
Pharmacological action
General Function
Phosphatidylinositol binding
Specific Function
Acts either as the functional imidazoline-1 receptor (I1R) candidate or as a membrane-associated mediator of the I1R signaling. Binds numerous imidazoline ligands that induces initiation of cell-si...
Gene Name
Uniprot ID
Uniprot Name
Molecular Weight
166627.105 Da
  1. Ernsberger P, Damon TH, Graff LM, Schafer SG, Christen MO: Moxonidine, a centrally acting antihypertensive agent, is a selective ligand for I1-imidazoline sites. J Pharmacol Exp Ther. 1993 Jan;264(1):172-82. [Article]
  2. Buccafusco JJ, Lapp CA, Westbrooks KL, Ernsberger P: Role of medullary I1-imidazoline and alpha 2-adrenergic receptors in the antihypertensive responses evoked by central administration of clonidine analogs in conscious spontaneously hypertensive rats. J Pharmacol Exp Ther. 1995 Jun;273(3):1162-71. [Article]

Drug created at October 23, 2015 20:26 / Updated at May 05, 2021 20:31