Gallamine triethiodide

≥98% (TLC), powder, muscarinic receptor antagonist

Empirical Formula (Hill Notation):
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Quality Level


≥98% (TLC)




235 °C (dec.) (lit.)


H2O: 100 mg/mL
ethanol: soluble

storage temp.


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Gallamine triethiodide has been used:
  • as a relaxant for measuring spinal trigeminal nucleus recordings from single neurons.
  • as an antagonist in neuroblastoma cells as M2 receptor
  • to reduce eye movement during retinal surgery in rat


5, 25 g in poly bottle

Biochem/physiol Actions

Gallamine triethiodide has anti-muscarinic effect. It is a competitive antagonist for the muscarinic receptor. Gallamine is regarded as neuromuscular blocking agent.
Muscle relaxant; allosteric muscarinic receptor antagonist with an order of potency of M2 > M1 = M4 > M3 = M5. Ligand for the peripheral anionic binding site of acetylcholinesterase.

Features and Benefits

This compound is a featured product for Neuroscience research. Click here to discover more featured Neuroscience products. Learn more about bioactive small molecules for other areas of research at sigma.com/discover-bsm.
This compound is also offered as part of Sigma′s Library of Pharmacologically Active Compounds (LOPAC®1280), a biologically annotated collection of high-quality, ready-to-screen compounds. Click here to learn more.
This compound is featured on the Acetylcholine Receptors (Muscarinic) page of the Handbook of Receptor Classification and Signal Transduction. To browse other handbook pages, click here.



Legal Information

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Hazard Statements

Precautionary Statements


Acute Tox. 4 Oral


13 - Non Combustible Solids

WGK Germany


Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves

Certificate of Analysis

Certificate of Origin

Sandrine B Daval et al.
Molecular pharmacology, 84(1), 71-85 (2013-04-23)
Bitopic binding properties apply to a variety of muscarinic compounds that span and simultaneously bind to both the orthosteric and allosteric receptor sites. We provide evidence that fluorescent pirenzepine derivatives, with the M1 antagonist fused to the boron-dipyrromethene [Bodipy (558/568)]...
Paul W Elsinghorst et al.
Journal of medicinal chemistry, 50(23), 5685-5695 (2007-10-20)
Gallamine and tacrine are allosteric antagonists at muscarinic M2 acetylcholine receptors and inhibitors of acetylcholinesterase. At both acetylcholine-binding proteins, gallamine and tacrine are known to occupy two different binding sites: in M2 receptors within the allosteric binding area and in...
The inhibitory effect of gallamine on muscarinic receptors
Clark AL and Mitchelson F
British Journal of Pharmacology, 58(3), 323-331 (1976)
Dar'ya S Redka et al.
Molecular pharmacology, 74(3), 834-843 (2008-06-17)
The M(2) muscarinic receptor has two topographically distinct sites: the orthosteric site and an allosteric site recognized by compounds such as gallamine. It also can exhibit cooperative effects in the binding of orthosteric ligands, presumably to the orthosteric sites within...
Olle Ekberg et al.
Dysphagia, 24(1), 32-39 (2008-04-26)
The muscles of the pharynx are controlled by networks of neurons under the control of specific regions in the brain stem, which have been fairly well studied. However, the transmission between these neurons and the pharyngeal muscles, at the motor...
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