Cơ Chế Tác Dụng :
Barbiturates work by binding to the GABAA receptor at either the alpha or the beta sub unit. These are binding sites that are distinct from GABA itself and also distinct from the benzodiazepine binding site. Like benzodiazepines, barbiturates potentiate the effect of GABA at this receptor. This GABAA receptor binding decreases input resistance, depresses burst and tonic firing, especially in ventrobasal and intralaminar neurons, while at the same time increasing burst duration and mean conductance at individual chloride channels; this increases both the amplitude and decay time of inhibitory postsynaptic currents. In addition to this GABA-ergic effect, barbiturates also block the AMPA receptor, a subtype of glutamate receptor. Glutamate is the principal excitatory neurotransmitter in the mammalian CNS.
Tương Tác Thuốc :
-
Amiloride
Decreases the antiarrhythmic effect of quinidine
-
Aminophylline
The barbiturate, dihydroquinidine barbiturate, decreases the effect of aminophylline.
-
Amiodarone
Increases the effect of quinidine
-
Amitriptyline
Dihydroquinidine barbiturate increases the effect of the tricyclic antidepressant, amitriptyline.
-
Aripiprazole
Quinidine increases the effect and toxicity of aripiprazole
-
Atazanavir
Increased risk of cardiotoxicity and arrhythmias
-
Betamethasone
The barbiturate, dihydroquinidine barbiturate, may decrease the effect of the corticosteroid, betamethasone.
-
Cimetidine
Increases the effect of quinidine
-
Cisapride
Increased risk of cardiotoxicity and arrhythmias
-
Clomipramine
Dihydroquinidine barbiturate increases the effect of the tricyclic antidepressant, clomipramine.
-
Codeine
Quinidine decreases the analgesic effect of codeine
-
Cyclosporine
The barbiturate, dihydroquinidine barbiturate, increases the effect of cyclosporine.
-
Desipramine
Dihydroquinidine barbiturate increases the effect of the tricyclic antidepressant, desipramine.
-
Dexamethasone
The barbiturate, dihydroquinidine barbiturate, may decrease the effect of the corticosteroid, dexamethasone.
-
Dextromethorphan
Quinidine increases the toxicity of dextromethorphan
-
Digoxin
Quinine/quinidine increases the effect of digoxin
-
Diltiazem
Increases the effect and toxicity of quinidine
-
Doxepin
Dihydroquinidine barbiturate increases the effect of the tricyclic antidepressant, doxepin.
-
Doxycycline
The anticonvulsant, dihydroquinidine barbiturate, decreases the effect of doxycycline.
-
Felodipine
The barbiturate, dihydroquinidine barbiturate, decreases the effect of felodipine.
-
Fludrocortisone
The barbiturate, dihydroquinidine barbiturate, may decrease the effect of the corticosteroid, fludrocortisone.
-
Folic Acid
Folic acid decreases the effect of anticonvulsant, dihydroquinidine barbiturate.
-
Gatifloxacin
Increased risk of cardiotoxicity and arrhythmias
-
Gefitinib
The CYP3A4 inducer, dihydroquinidine barbiturate, may decrease the serum concentration and therapeutic effects of gefitinib.
-
Grepafloxacin
Increased risk of cardiotoxicity and arrhythmias
-
Griseofulvin
The barbiturate, dihydroquinidine barbiturate, decreases the effect of griseofulvin.
-
Hydrocortisone
The barbiturate, dihydroquinidine barbiturate, may decrease the effect of the corticosteroid, hydrocortisone.
-
Imipramine
Dihydroquinidine barbiturate increases the effect of the tricyclic antidepressant, imipramine.
-
Levofloxacin
Increased risk of cardiotoxicity and arrhythmias
-
Levonorgestrel
Phenobarbital decreases the effect of levonorgestrel
-
Magnesium
The antiacid decreases the absorption of quinidine
-
Methadone
The barbiturate, dihydroquinidine barbiturate, decreases the effect of methadone.
-
Metronidazole
The barbiturate, dihydroquinidine barbiturate, decreases the effect of metronidazole.
-
Moxifloxacin
Increased risk of cardiotoxicity and arrhythmias
-
Nelfinavir
Nelfinavir increases the effect and toxicity of quindine
-
Nifedipine
Decreased quinidine effect, increased nifedipine effect
-
Nortriptyline
Dihydroquinidine barbiturate increases the effect of the tricyclic antidepressant, nortriptyline.
-
Ofloxacin
Increased risk of cardiotoxicity and arrhythmias
-
Oxtriphylline
The barbiturate, dihydroquinidine barbiturate, decreases the effect of oxtriphylline.
-
Prednisolone
The barbiturate, dihydroquinidine barbiturate, may decrease the effect of the corticosteroid, prednisolone.
-
Prednisone
The barbiturate, dihydroquinidine barbiturate, may decrease the effect of the corticosteroid, prednisone.
-
Procainamide
Quinidine increases the effect of procainamide
-
Propafenone
Quinidine increases the effect of propafenone
-
Quinidine
The anticonvulsant, dihydroquinidine. barbiturate, decreases the effect of quinidine.
-
Quinupristin
This combination presents an increased risk of toxicity
-
Theophylline
The barbiturate, dihydroquinidine barbiturate, decreases the effect of theophylline.
-
Triamcinolone
The barbiturate, dihydroquinidine barbiturate, may decrease the effect of the corticosteroid, triamcinolone.