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A GABA reuptake inhibitor (GRI) is a type of drug which acts as a reuptake inhibitor for the neurotransmitter gamma-Aminobutyric acid (GABA) by blocking the action of the gamma-Aminobutyric acid transporters (GATs). This in turn leads to increased extracellular concentrations of GABA and therefore an increase in GABAergic neurotransmission. [1]
In general these drugs produce stimulant and convulsant effects, and are mainly used for counteracting overdoses of sedative drugs. Examples include bicuculline, securinine and metrazol, and the benzodiazepine GABA A receptor antagonist flumazenil. Other agents which may have GABA A receptor antagonism include the antibiotic ciprofloxacin, [1 ...
A GABAergic or GABAnergic agent is any chemical that modifies the effects of GABA in the body or brain. Some different classes of GABAergic drugs include agonists, antagonists, modulators, reuptake inhibitors and enzymes. [1]
A GABA A receptor negative allosteric modulator is a negative allosteric modulator (NAM), or inhibitor, of the GABA A receptor, a ligand-gated ion channel of the major inhibitory neurotransmitter γ-aminobutyric acid (GABA). [1] [2] They are closely related and similar to GABA A receptor antagonists.
Vigabatrin reduced cholecystokinin tetrapeptide-induced symptoms of panic disorder, in addition to elevated cortisol and ACTH levels, in healthy volunteers. [12]Vigabatrin is also used to treat seizures in succinic semialdehyde dehydrogenase deficiency (SSADHD), which is an inborn GABA metabolism defect that causes intellectual disability, hypotonia, seizures, speech disturbance, and ataxia ...
By the early 1970s, it was appreciated that there are two main classes of GABA receptors, GABA A and GABA B and also that baclofen was an agonist of GABA B receptors. Gabapentin was designed, synthesized and tested in mice by researchers at the pharmaceutical company Goedecke AG in Freiburg, Germany (a subsidiary of Parke-Davis ).
DABA's main action is being an inhibitor of GABA transaminase, an enzyme that converts GABA back to glutamate. When the enzyme is inhibited, this conversion cannot happen, therefore, GABA levels are elevated. [1] It has also been observed that 2,4-diaminobutyric acid is a GABA reuptake inhibitor. [2] This action further elevates levels of GABA.
Side effects of tiagabine are dose related. [6] The most common side effect of tiagabine is dizziness . [ 8 ] Other side effects that have been observed with a rate of statistical significance relative to placebo include asthenia , somnolence , nervousness, memory impairment , tremor , headache , diarrhea , and depression .