Lacosamide is an antiepileptic drug that has been approved by the FDA since 2008 for the treatment of partial-onset seizures in adults with epilepsy [1]. According to a study published in the journal Epilepsia, lacosamide has shown to be an effective maintenance therapy for patients with epilepsy [3]. The study showed that lacosamide was able to significantly reduce the frequency of seizures in patients with partial-onset seizures when compared to a placebo group. The study also showed that the drug was well-tolerated and had a good safety profile.

Another study published in the journal CNS Drugs also supports the effectiveness of lacosamide as a maintenance therapy for epilepsy [2]. The study showed that lacosamide was able to significantly reduce the frequency of seizures in patients with partial-onset seizures, and that the drug was generally well-tolerated with a low incidence of adverse effects.

Overall, the available evidence suggests that lacosamide is an effective maintenance therapy for patients with partial-onset seizures in adults with epilepsy. However, as with any medication, individual responses may vary and it is important for patients to work closely with their healthcare provider to determine the best treatment plan for their specific needs.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LACOSAMIDE
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5367645/
[3] https://onlinelibrary.wiley.com/doi/full/10.1111/j.1528-1167.2009.02496.x