What Is Motpoly XR? Uses, Dosage, and What You Need to Know in 2026

Motpoly XR is a once-daily prescription medication used to treat epilepsy. Whether you've just been prescribed it, are considering it, or are helping a loved one understand their treatment, this guide covers everything you need to know about Motpoly XR in plain language.

What Is Motpoly XR?

Motpoly XR is the brand name for lacosamide extended-release capsules, made by Aucta Pharmaceuticals. It is an antiepileptic drug (AED) — a class of medications that control or prevent seizures. The active ingredient, lacosamide, has been used since 2008 (as Vimpat, the immediate-release version). Motpoly XR is the once-daily extended-release formulation, FDA-approved in May 2023.

"Extended-release" means the medication is released gradually over 24 hours, maintaining a steady level in your bloodstream throughout the day. This is different from Vimpat (lacosamide IR), which must be taken twice daily because it releases more quickly and wears off faster.

What Is Motpoly XR Used For?

Motpoly XR is FDA-approved for two indications:

Partial-onset seizures (also called focal-onset seizures) — used alone (monotherapy) or with other seizure medications (adjunctive therapy) in adults and children weighing at least 110 lbs (50 kg).

Primary generalized tonic-clonic (PGTC) seizures — used with other seizure medications (adjunctive therapy only, not as sole treatment) in adults and children weighing at least 110 lbs. This indication was added in June 2024.

Partial-onset seizures start in one part of the brain. PGTC seizures (sometimes called "grand mal" seizures) involve both sides of the brain from the start and typically cause loss of consciousness, stiffening, and rhythmic jerking of the whole body.

Motpoly XR Dosage: How Much Do You Take?

Motpoly XR comes in three strengths: 100 mg, 150 mg, and 200 mg extended-release capsules. The typical dosing approach is:

Starting dose: 100 mg once daily (your doctor may start at 200 mg in some situations)

Titration: Your doctor will increase your dose gradually based on how your seizures respond and how well you tolerate side effects

Maintenance dose: Usually 200–400 mg once daily

Maximum dose: 400 mg per day (lower limits apply for patients with severe kidney or liver problems)

How to Take Motpoly XR

Once daily: Take Motpoly XR at the same time each day for best results

With or without food: Motpoly XR can be taken with or without food. Taking it with food may reduce nausea.

Swallow whole: Do not open, crush, or chew the capsules. This would destroy the extended-release mechanism and release the drug all at once, increasing side effect risk.

Missed dose: Take it as soon as you remember. If it's almost time for your next dose, skip the missed dose — don't double up.

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Is Motpoly XR a Controlled Substance?

Yes. Motpoly XR is a federally controlled substance classified as Schedule V (CV) — the lowest schedule, indicating some potential for dependence. This means:

You need a prescription from a licensed prescriber with DEA registration

Keep Motpoly XR in a secure location, out of reach of others

Never share Motpoly XR with anyone — it could harm them, and sharing controlled substances is illegal

Who Should NOT Take Motpoly XR?

Children weighing less than 110 lbs (50 kg) — safety and efficacy not established

Patients with severe hepatic (liver) impairment

Patients allergic to lacosamide or any ingredient in the capsules

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How Does Motpoly XR Differ From Vimpat?

Both Motpoly XR and Vimpat contain lacosamide. The key difference is the formulation: Vimpat is immediate-release (taken twice daily), while Motpoly XR is extended-release (taken once daily). This makes Motpoly XR more convenient and may reduce peak-dose side effects. However, Vimpat has a generic available at much lower cost. There is currently no generic for Motpoly XR.

For a deeper dive into how Motpoly XR works in the brain, see: How Does Motpoly XR Work? Mechanism of Action Explained.

If you're having trouble finding Motpoly XR in stock, medfinder can help you locate it at nearby pharmacies quickly.