Yes. Lacosamide (Vimpat) can have its adverse effects increased by other drugs in a couple of ways:
1) Pharmacokinetic interactions (increasing lacosamide levels)
- Drugs that inhibit the liver pathways that metabolize lacosamide or that compete with its clearance can raise lacosamide exposure. This can make side effects like dizziness, drowsiness, blurred vision (diplopia), coordination problems (ataxia), or confusion more likely.
- Lacosamide is mainly eliminated by the kidneys, but the hepatic pathways (including certain glucuronidation routes and CYP2C19) help clear it. So strong inhibitors of those pathways can raise lacosamide levels.
- Examples aren’t always predictable from memory alone, so it’s best to check a drug interaction resource or the lacosamide label if you’re starting or stopping a new medicine known to affect liver enzymes (antifungals like some azoles, certain antidepressants, etc.). If unsure, ask the clinician or pharmacist.
2) Pharmacodynamic interactions (additive CNS effects)
- Central nervous system depressants can amplify lacosamide’s side effects. This includes:
- Alcohol
- Benzodiazepines (e.g., diazepam, lorazepam)
- Opioids (e.g., morphine, oxycodone)
- Barbiturates or other sedating drugs
- Sedating antihistamines (e.g., diphenhydramine)
- Some other anti-seizure medications that also cause dizziness or drowsiness
- With these, you may notice more dizziness, sleepiness, or coordination problems.
3) Drugs affecting heart conduction (can heighten PR-prolonging risk)
- Lacosamide can prolong the PR interval. When taken with other drugs that slow AV nodal conduction, such as:
- Non-dihydropyridine calcium channel blockers (verapamil, diltiazem)
- Certain beta-blockers (metoprolol, propranolol)
- Some antiarrhythmics or digoxin
- there’s a higher risk of conduction issues (e.g., dizziness, fainting) or heart rhythm problems.
What you can do
- If you’re starting lacosamide or adding any new medication, tell your prescriber about all medicines you take (prescriptions, over-the-counter meds, supplements, alcohol).
- Monitor for increased dizziness, drowsiness, double vision, trouble concentrating, or any changes in heart rhythm or symptoms like fainting.
- Ask your clinician about ECG monitoring (PR interval) if you’re taking drugs that affect heart conduction.
- Avoid or limit alcohol while taking lacosamide to reduce CNS effects.
- If you notice concerning symptoms after starting or changing a medication, contact your healthcare provider promptly.
If you want, tell me the exact medicines you’re taking with lacosamide and I can help outline potential interactions more specifically.