6-Chloro-3,4-dihydro-3-(2-norbornen-5-yl)-2H-1,2-4-benzothiadiazine-7-sulfonamide 1,1-dioxide
Empirical Formula (Hill Notation):
CAS Number:
Molecular Weight:
EC Number:
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PubChem Substance ID:
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Quality Level


Eli Lilly

storage temp.


SMILES string




InChI key


Gene Information

human ... CA1(759), CA4(762), GRIA1(2890), GRIA2(2891), GRIA3(2892), GRIA4(2893)
rat ... Gria1(50592)

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General description

Cyclothiazide is a benzothiadiazine, which has a similar structure to diazoxide.


Cyclothiazide has been used as a α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor (AMPAR) desensitization blocker to study the effects of γ2 on receptor desensitization.


10 mg in poly bottle
25 mg in glass bottle

Biochem/physiol Actions

Blocks the rapid desensitization of the AMPA glutamate receptors and markedly prolongs the decay time of the evoked excitatory post-synaptic current.

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 was developed by Eli Lilly. To browse the list of other pharma-developed compounds and Approved Drugs/Drug Candidates, click here.
This compound is featured on the Glutamate Receptors (Ion Channel Family) page of the Handbook of Receptor Classification and Signal Transduction. To browse other handbook pages, click here.

Legal Information

LOPAC is a registered trademark of Sigma-Aldrich Co. LLC

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves

Hazard Codes


Risk Statement


Safety Statement



NONH for all modes of transport

WGK Germany


Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

L O Trussell et al.
Neuron, 10(6), 1185-1196 (1993-06-01)
We have investigated the role of AMPA receptor desensitization during transmission at a calyceal synapse. Cyclothiazide blocked the rapid desensitization of AMPA receptors and markedly prolonged the decay time of the evoked excitatory postsynaptic current (PSC). This effect was greater...
D K Patneau et al.
The Journal of neuroscience : the official journal of the Society for Neuroscience, 13(8), 3496-3509 (1993-08-01)
In whole-cell recordings from mammalian CNS neurons, AMPA-preferring glutamate receptors exhibit strong desensitization in response to AMPA, glutamate, and quisqualate, but not to kainate or domoate. Such desensitization is reduced by lectins, by the nootropic drug aniracetam, and by diazoxide....
Lu-Yang Wang et al.
The Journal of neuroscience : the official journal of the Society for Neuroscience, 28(53), 14450-14458 (2009-01-02)
During development of the calyx of Held synapse, presynaptic action potentials (APs) become substantially faster and briefer. Nevertheless, this synapse is able to upregulate quantal output triggered by arriving APs. Briefer APs lead to less effective gating of voltage-gated Ca(2+)...
Martin Loynaz Prieto et al.
The Journal of neuroscience : the official journal of the Society for Neuroscience, 30(12), 4449-4459 (2010-03-26)
AMPA receptors are ligand-gated ion channels that show multiple conductance levels, indicating that gating of individual AMPA subunits is to some extent independent of the other subunits. To study AMPAR subunit interactions during activation gating, we recorded from single channels...
Mahesh M Karnani et al.
The Journal of physiology, 589(Pt 3), 639-651 (2010-12-08)
Hypothalamic hypocretin/orexin (hcrt/orx) neurons promote arousal and reward seeking, while reduction in their activity has been linked to narcolepsy, obesity and depression. However, the mechanisms influencing the activity of hcrt/orx networks in situ are not fully understood. Here we show...
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