lacosamide vs topiramate
PlainMeds reviewed this comparison against our methodology in August 2026. It places FDA and CMS record fields side by side, without recommending either medication.
Side-by-side comparison of lacosamide and topiramate. Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
Vimpat
Topamax
Lacosamide is a medicine that can help control seizures. It is used to treat partial-onset seizures and primary generalized tonic-clonic seizures in people 4 years and older.
Topiramate is a medicine that can help prevent seizures and migraines. It works by calming the brain.
Lacosamide is used to treat partial-onset seizures in patients 4 years of age and older. It is also used with other medicines to treat primary generalized tonic-clonic seizures in patients 4 years of age and older. Seizures are caused by unusual electrical activity in the brain.
Topiramate can be used alone or with other medicines to treat certain types of seizures in people 2 years and older. These seizures include partial-onset seizures and primary generalized tonic-clonic seizures. It also treats seizures related to Lennox-Gastaut syndrome. Topiramate can also help prevent migraine headaches in people 12 years and older.
Lacosamide is an anticonvulsant. It is thought to work by slowing down the electrical signals in the brain that cause seizures. This helps to reduce how often seizures happen.
Topiramate works by reducing the excitability of brain cells. It also increases the activity of a brain chemical called GABA. These actions help to prevent seizures and migraines.
- • Double vision
- • Headache
- • Dizziness
- • Feeling sick to your stomach
- • Sleepiness
- • Tingling or numbness
- • Loss of appetite
- • Weight loss
- • Speech problems
- • Tiredness
- Seizure 6,507
- Dizziness 1,612
- Somnolence 1,404
- Fatigue 1,376
- Fall 1,337
- Headache 6,464
- Nausea 5,710
- Fatigue 5,293
- Pain 4,485
- Migraine 4,373
Lacosamide and other anti-seizure medicines may increase the risk of suicidal thoughts or actions. Tell your doctor right away if you have any new or worsening symptoms of depression, suicidal thoughts, or unusual changes in mood or behavior. Lacosamide can also cause heart rhythm problems. Get an ECG before starting and during treatment.
Topiramate can cause serious side effects. It can cause vision problems, including sudden nearsightedness and glaucoma. It can decrease sweating and increase body temperature, especially in children. It can cause metabolic acidosis (too much acid in the blood). It may increase the risk of suicidal thoughts or actions. It can affect thinking and coordination. It can harm an unborn baby. It can decrease bone mineral density. It can slow growth in children. It can cause serious skin reactions. It can cause kidney stones. If you experience any of these, contact your doctor immediately.
Lacosamide may harm an unborn baby. If you are pregnant or plan to become pregnant, talk to your doctor about the risks and benefits of taking lacosamide. There is a pregnancy registry for women who take anti-epileptic drugs like lacosamide.
Topiramate can harm your unborn baby. It may cause birth defects like cleft lip or cleft palate. It can also cause the baby to be smaller than normal. If you are pregnant or plan to become pregnant, talk to your doctor about the risks and benefits of taking topiramate.
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How to Read This lacosamide vs topiramate Comparison
lacosamide is classified in the Anticonvulsant drug class, while topiramate sits within the Anticonvulsant class. Because both drugs share the same classification, they are often considered interchangeable in theory, but clinical outcomes rarely track that cleanly. Both drugs are prescription-only, so a licensed provider must authorize use.
Adverse event totals above are pulled from the FDA's Adverse Event Reporting System (FAERS). For these top-ranked reactions alone, lacosamide has 12,236 submissions while topiramate has 26,325. Those figures reflect cumulative reporting volume, not per-patient risk, so older, widely dispensed drugs typically look worse on count alone. No direct interaction between these two drugs is listed in our FDA-derived dataset, though co-prescription still warrants pharmacist review. Serious warnings, pregnancy guidance, and contraindications can differ even when indications overlap.
A table cannot represent individual circumstances. Data here is sourced from FDA Structured Product Labels (SPL) and FAERS, both of which update as manufacturers and clinicians submit new information. This registry does not provide medical, treatment, substitution, or medication-change directions for lacosamide or topiramate.
Registry boundary: This comparison displays source-record fields and does not provide individualized medical direction.