Lacosamide is an antiepileptic drug used to treat partial-onset seizures in adults. There is no specific duration for lacosamide maintenance therapy, as it depends on the individual patient's response to the drug and the severity of their seizures.

According to a study published in the journal Epilepsia [3], lacosamide has been shown to be effective and well-tolerated for up to 3 years of treatment. However, the duration of treatment should be determined on a case-by-case basis by the treating physician, taking into account the patient's response to the drug, any adverse effects, and the overall management of their epilepsy.

It is important to note that the use of lacosamide, like any antiepileptic drug, should be carefully monitored by a healthcare professional. Patients should not stop taking lacosamide or adjust their dosage without consulting their doctor, as sudden changes can increase the risk of seizures or other adverse effects.

In conclusion, the duration of lacosamide maintenance therapy should be determined by the treating physician based on the individual patient's response to the drug and the management of their epilepsy. Patients should work closely with their healthcare team to ensure safe and effective use of lacosamide.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LACOSAMIDE
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2912003/
[3] https://onlinelibrary.wiley.com/doi/full/10.1111/j.1528-1167.2009.02496.x