Successful treatment of idiopathic generalized epilepsy begins with accurate seizure classification. Seizure types, such as absence, myoclonic, and primary generalized tonic-clonic seizures (PGTCS), often can be classified based on a detailed history and inter-ictal electroencephalogram (EEG). Ideally, patients can be classified into specific epilepsy syndromes, such as childhood absence epilepsy, juvenile myoclonic epilepsy (JME), or generalized tonic-clonic seizures on awakening. Idiopathic generalized epilepsy should be distinguished from focal epilepsy with rapid secondary generalization. If this distinction is not clear after history, physical examination, and routine inter-ictal EEG, then ambulatory EEG, video EEG monitoring, or neuroimaging studies may be needed. Ethosuximide, valproate, or lamotrigine are all appropriate first-line choices in the treatment of childhood absence epilepsy. The specific medication should be chosen based on the side effect profiles, dosing formulations, and titration schedules of the medications. The available evidence best supports valproate as the first-line choice in the treatment of JME, although lamotrigine and topiramate may be appropriate choices in this setting. More data specific to JME are needed to clarify the role of medications such as levetiracetam and zonisamide in the treatment of JME. The available evidence to guide the treatment of PGTCS is limited, because most trials did not rigorously exclude patients with focal epilepsy with rapid secondary generalization. Available evidence suggests that valproate is an appropriate first-line choice for PGTCE. Lamotrigine or topiramate also may be appropriate choices. More data are needed to clarify the role of levetiracetam and zonisamide in the treatment of PGCTS. If it is unclear whether a patient has idiopathic generalized epilepsy or focal epilepsy with secondary generalization, then a broad-spectrum anticonvulsant, including valproate, lamotrigine, or topiramate, should be considered. More data are needed to support the broad-spectrum efficacy of levetiracetam and zonisamide.