It is very important that your doctor check your progress at regular visits to make sure this medicine is working properly. Blood tests may be needed to check for unwanted effects.
It is important to tell your doctor if you become pregnant or planning to become pregnant. Your doctor may want you to join the North American Antiepileptic Drug Pregnancy Registry and UCB AED Pregnancy Registry. These registries are used by pregnant patients who are taking this medicine.
If you develop any unusual or strange thoughts and behavior while taking lacosamide, be sure to discuss it with your doctor. Some changes that have occurred in people taking this medicine are like those seen in people who drink too much alcohol. Other changes might be confusion, worsening of depression, hallucinations (seeing, hearing, or feeling things that are not there), suicidal thoughts, and unusual excitement, nervousness, or irritability.
This medicine may cause blurred vision, double vision, clumsiness, unsteadiness, dizziness, drowsiness, sleepiness, or trouble with thinking. Make sure you know how you react to this medicine before you drive, use machines, or do anything else that could be dangerous if you are not alert, well-coordinated, or able to think or see well. If these side effects are especially bothersome, check with your doctor.
This medicine can cause changes in heart rhythms, such as a condition called PR prolongation. It may change the way your heart beats and cause lightheadedness, fainting, or serious side effects in some patients. Contact your doctor right away if you have any symptoms of heart rhythm problems, such as fast, slow, or irregular heartbeats.
Do not stop taking this medicine without first checking with your doctor. Stopping the medicine suddenly may cause your seizures to return or to occur more often. Your doctor may want you to gradually reduce the amount you are using before stopping it completely.
Lacosamide may cause serious allergic reactions affecting multiple body organs (e.g., liver or kidney). Stop using this medicine and check with your doctor right away if you have the following symptoms: fever; dark urine; headache; rash; stomach pain; swollen, painful, or tender lymph glands in the neck, armpit, or groin; unusual tiredness; or yellow eyes or skin.