Seizure suppression is an effect caused by drugs known as "anticonvulsants". These drugs prevent or reduce the severity and frequency of seizures in various types of epilepsy. The different types of anticonvulsants may act on different receptors in the brain and have different modes of action. Two mechanisms that appear to be important in anticonvulsants are an enhancement of GABA action and inhibition of sodium channel activity. Other mechanisms are the inhibition of calcium channels and glutamate receptors. Seizure suppression is most commonly induced under the influence of moderate dosages of certain GABAergic compounds and certain cannabinoids.