Which of the following is NOT a common side effect of anticonvulsants?

Anticonvulsants, which are primarily used to manage epilepsy and other seizure disorders, typically come with a range of common side effects that stem from their central nervous system activity. Drowsiness, dizziness, and nausea are frequently reported among patients taking these medications, attributed to their sedative properties and impacts on neurotransmitter systems.

Drowsiness and dizziness can result from the sedative effects of the medication, as anticonvulsants often affect levels of gamma-aminobutyric acid (GABA) or other neurotransmitters that play a role in regulating alertness and balance. Nausea is another common side effect related to gastrointestinal irritation or changes in metabolism caused by the drugs.

In contrast, excessive energy is not a typical side effect associated with anticonvulsants. These medications are not stimulants, and their primary role in controlling seizure activity is to create a calming effect on the brain's activity, inherently leading to opposite outcomes, such as drowsiness or lethargy. Hence, excessive energy stands out as an unlikely side effect when considering the pharmacological profile of anticonvulsants.