Lacosamide is an anticonvulsant drug used to treat partial-onset seizures in adults. According to the sources provided, there are several drug interactions associated with lacosamide.

Drugs.com [1] states that lacosamide may interact with other antiepileptic drugs, such as carbamazepine, phenytoin, and valproic acid. These drugs may decrease the effectiveness of lacosamide or increase the risk of side effects. In addition, lacosamide may increase the risk of suicidal thoughts or behavior when taken with antidepressant drugs, such as fluoxetine and paroxetine.

According to RxList [2], lacosamide may also interact with drugs that affect heart rhythm, such as amiodarone, quinidine, and verapamil. These drugs may increase the risk of serious side effects, including heart problems.

DrugPatentWatch [3] notes that lacosamide may interact with drugs that are metabolized by the liver, such as rifampin and cimetidine. These drugs may increase or decrease the levels of lacosamide in the body, affecting its effectiveness or increasing the risk of side effects.

It is important to inform your healthcare provider of all medications, vitamins, and supplements you are taking before starting lacosamide to avoid potential drug interactions. Your healthcare provider may need to adjust the dosage or monitor you closely for side effects if you are taking lacosamide with other medications.

Sources:
[1] https://www.drugs.com/drug-interactions/lacosamide.html
[2] https://www.rxlist.com/lacosamide/generic-drug.htm
[3] https://www.drugpatentwatch.com/p/tradename/LACOSAMIDE