Lacosamide is an antiepileptic medication used to treat seizures, but it can also cause cardiac side effects, including arrhythmia, in some individuals. According to various sources, including DrugPatentWatch.com [1], arrhythmia induced by lacosamide may exhibit the following symptoms:

Rapid or irregular heartbeats [2]
Palpitations or a feeling of pounding or fluttering in the chest
Shortness of breath or difficulty breathing
Chest pain or discomfort
Dizziness or lightheadedness
Fainting or near-fainting

It is essential to note that arrhythmia induced by lacosamide can be a serious and potentially life-threatening condition. If you are taking lacosamide and experience any of these symptoms, seek medical attention immediately.

In addition to these symptoms, some individuals may experience more severe cardiac issues, such as:

Heart block or QT prolongation, which can lead to serious arrhythmias [3]
Increased risk of sudden cardiac death

If you are taking lacosamide, it is crucial to discuss any cardiac concerns with your healthcare provider before starting or continuing treatment.

Sources:

[1] DrugPatentWatch.com - Lacosamide
[2] PubMed - "Lacosamide-induced arrhythmia: a case report and review of the literature"
[3] Epilepsia - "Cardiac conduction prolongation with lacosamide: a case series"