Lacosamide is a medication that is primarily used to treat partial-onset seizures in patients with epilepsy. Like any medication, it can have potential side effects that patients should be aware of. According to the sources provided, the following are some of the potential side effects of lacosamide:

1. Common side effects: These side effects may affect a significant number of patients taking lacosamide. They include dizziness, headache, blurred vision, nausea, vomiting, and sleepiness [2][3].

2. Serious side effects: Although less common, lacosamide can also cause serious side effects that require immediate medical attention. These include allergic reactions such as rash, itching, swelling, severe dizziness, and trouble breathing. It may also cause changes in mood or behavior, such as agitation, aggression, irritability, or thoughts of self-harm. Additionally, lacosamide can increase the risk of suicidal thoughts or actions [2][3].

3. Other potential side effects: Lacosamide may cause changes in heart rhythm, leading to palpitations or irregular heartbeat. It can also affect the nervous system, causing coordination problems, tremors, or difficulty walking. Some patients may experience a decrease in appetite, weight loss, or constipation. Rarely, lacosamide can cause liver problems, which may manifest as yellowing of the skin or eyes, dark urine, or persistent nausea [2][3].

It is important to note that not all patients will experience these side effects, and some may experience side effects not listed here. It is recommended to consult a healthcare professional for a complete list of potential side effects and to discuss any concerns or questions about lacosamide.

In conclusion, while lacosamide can be an effective treatment for partial-onset seizures, it is important to be aware of its potential side effects. Common side effects include dizziness, headache, blurred vision, nausea, vomiting, and sleepiness. Serious side effects may include allergic reactions, changes in mood or behavior, and an increased risk of suicidal thoughts or actions. Other potential side effects may affect the heart rhythm, nervous system, appetite, weight, or liver. Patients should consult their healthcare professional for more information and to discuss any concerns [2][3].

Sources:
[2] Mayo Clinic. (n.d.). Lacosamide (Oral Route) - Side Effects. Retrieved from https://www.mayoclinic.org/drugs-supplements/lacosamide-oral-route/side-effects/drg-20072409?p=1
[3] MedlinePlus. (2021). Lacosamide. Retrieved from https://medlineplus.gov/druginfo/meds/a609028.html