Lacosamide is a medication used to treat partial-onset seizures in adults with epilepsy [2]. According to the sources provided, some of the side effects of lacosamide include dizziness, headache, nausea, vomiting, blurred vision, and difficulty sleeping [1][2][3]. Other common side effects include double vision, tremors, and problems with coordination [1].

In rare cases, lacosamide can cause more serious side effects such as an allergic reaction, suicidal thoughts, and irregular heart rhythms [2][3]. It is important to seek medical attention immediately if any of these symptoms occur.

Lacosamide can also interact with other medications, such as antidepressants and antipsychotics, which can increase the risk of side effects [2]. Patients should always inform their doctor of all medications they are taking before starting lacosamide.

In conclusion, while lacosamide is an effective medication for treating partial-onset seizures in adults with epilepsy, it can cause side effects such as dizziness, headache, nausea, vomiting, blurred vision, and difficulty sleeping. Patients should be aware of the potential for more serious side effects and should inform their doctor of all medications they are taking before starting lacosamide [1][2][3].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LACOSAMIDE
[2] https://www.mayoclinic.org/drugs-supplements/lacosamide-oral-route/side-effects/drg-20072409?p=1
[3] https://medlineplus.gov/druginfo/meds/a609028.html