Product overview

Name (-)-Bicuculline methobromide
Description Prototypic, competitive GABAA receptor antagonist
Alternative names BIC
Purity >98%
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Bicuculline methobromide inhibition of GABAA receptor IPSCs
(-)-Bicuculline methobromide: Scientist Approved

Biological Data

Biological description

Methobromide salt form of (+)-bicuculline.

Prototypic, competitive GABAA receptor antagonist which displaces GABA from the agonist binding site to prevent receptor activation. 

Also acts as a negative allosteric inhibitor of channel opening to inhibit GABAA receptor activation by anaesthetic agents.

Additionally shows activity at SK calcium-activated potassium channels, nicotinic acetylcholine receptors and acetylcholinesterase.

Reversibly and competitively blocks GABAA receptor mediated currents. Widely used to isolate glutamate receptor mediated EPSCs (excitatory postsynaptic potentials).

Shows convulsant action and induces epilepsy.

Freebase, methiodide and methochloride salts also available.

Application notes

The GABAA receptor antagonist bicuculline is commonly used to reduce levels of inhibition by blocking the actions of the neurotransmitter GABA. Bicuculline is commonly used at concentrations of 100 μM and above. Bicuculline methobromide from Hello Bio reduces both spontaneous inhibitory post synaptic currents (IPSC) and evoked IPSCs (see Fig 1 above). It was effective at concentrations of 1 mM with complete receptor blockade at 100 μM



#Protocol 1: Evoked and spontaneous inhibitory post synaptic currents (IPSCs)

  • Whole cell voltage clamp recordings were obtained from layer V neurons of the mouse prelimbic cortex brain slice.
  • A stimulating electrode was placed in layers II/III and IPSCs were evoked by a single square (150 μs) pulse every 10 sec at a stimulus intensity that gave a reliable IPSC.
  • IPSCs were evoked at a range of neuron holding voltages to measure the reversal potential of the current to ensure it was GABAergic.
  • Neurons were held at 0mV and IPSCs continuously stimulated and recorded in response to 5 min applications of varying concentrations of Gabazine until complete receptor inhibition.
  • Spontaneous IPSCs were recorded before and after addition of Gabazine by holding the neuron at 0mV and recording for 10 sec.
  • All recordings for IPSCs were made in the presence of AMPAR antagonists.

Solubility & Handling

Storage instructions Room temperature
Solubility overview Soluble in water (50mM)
Important This product is for RESEARCH USE ONLY and is not intended for therapeutic or diagnostic use. Not for human or veterinary use.



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Chemical Data

Chemical name [R-(R*,S*)]-5-(6,8-Dihydro-8-oxofuro[3,4-e]-1,3-benzodioxol-6-yl)-5,6,7,8-tetrahydro-6,6-dimethyl-1,3-dioxolo[4,5-g]isoquinolinium bromide
Molecular Weight 462.3
Chemical structure (-)-Bicuculline methobromide  [73604-30-5] Chemical Structure
Molecular Formula C21H20BrNO6
CAS Number 73604-30-5
PubChem identifier 171729
SMILES C[N+]1(CCC2=CC3=C(C=C2C1C4C5=C(C6=C(C=C5)OCO6)C(=O)O4)OCO3)C.[Br-]
InChi InChI=1S/C21H20NO6.BrH/c1-22(2)6-5-11-7-15-16(26-9-25-15)8-13(11)18(22)19-12-3-4-14-20(27-10-24-14)17(12)21(23)28-19;/h3-4,7-8,18-19H,5-6,9-10H2,1-2H3;1H/q+1;/p-1
MDL number MFCD00055149
Appearance White solid

References for (-)-Bicuculline methobromide

References are publications that support the biological activity of the product
  • Advantages of an antagonist: bicuculline and other GABA antagonists.

    Johnston GA (2013) Br J Pharmacol 169(2) : 328-36.
  • [Bicuculline inhibits airway remodeling in a murine model of chronic asthma].

    Zhu T et al (2010) Nan Fang Yi Ke Da Xue Xue Bao 30(4) : 842-6.
  • Differential effects of iontophoretic in vivo application of the GABA(A)-antagonists bicuculline and gabazine in sensory cortex.

    Kurt S et al (2006) Hear Res 212(1-2) : 224-35.