Drug interaction of levitiracetam Propranolol primidone Lacoset and vitamin c 500 mg
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levetiracetam lacosamide propranolol primidone prescribing information drug interactions PR interval
Assuming Lacoset = lacosamide, this combination can be used in epilepsy/tremor care, but needs clinician monitoring.
| Combination | Main concern |
|---|---|
| Levetiracetam + lacosamide | No important drug-level interaction is expected. However, both can cause dizziness, sleepiness, poor coordination, and blurred/double vision, so these effects can add up. |
| Levetiracetam + primidone | No major direct interaction, but primidone can cause marked sedation and imbalance. Levetiracetam can contribute to drowsiness and mood or behavioral changes. |
| Primidone + lacosamide | Additive dizziness, drowsiness, and ataxia. Primidone is converted partly to phenobarbital and may lower levels of some medicines through enzyme induction, so seizure/tremor control should be monitored if doses change. Do not stop primidone suddenly. |
| Propranolol + lacosamide | Most important interaction to discuss with the prescriber. Propranolol slows heart rate and AV-node conduction; lacosamide can prolong the PR interval and has been associated with AV block and bradycardia. Together, they can increase risk of a slow pulse, fainting, or conduction problems, especially with existing heart disease, low resting pulse, or prior ECG abnormalities. The FDA lacosamide label advises caution with medicines that affect cardiac conduction and ECG monitoring in at-risk patients. |
| Propranolol + primidone | Commonly prescribed together for essential tremor, but can cause extra fatigue, dizziness, low blood pressure, and slow pulse. |
| Vitamin C 500 mg | No meaningful interaction is known with levetiracetam, propranolol, primidone, or lacosamide at this usual supplement dose. It can usually be taken at any time, with food if it irritates the stomach. |
What to do
- Do not stop or skip levetiracetam, primidone, or lacosamide abruptly. That can provoke seizures.
- Ask the prescribing clinician or pharmacist whether you need a baseline ECG and pulse/BP monitoring, particularly if taking propranolol with lacosamide.
- Avoid alcohol, driving, or operating machinery until you know how the combined medicines affect you.
- Seek urgent care for fainting, near-fainting, chest pain, breathlessness, a very slow/irregular heartbeat, or severe new confusion/unsteadiness.
Lacosamide’s recognized concerns include dizziness/ataxia and cardiac rhythm or conduction effects, as summarized in DailyMed prescribing information. Levetiracetam generally has few pharmacokinetic interactions, but drowsiness, dizziness, coordination problems, and behavioral effects can still be clinically important.
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