Lacosamide for Pets

Overview

Lacosamide is a third-generation antiepileptic drug (AED) that provides an alternative treatment option for dogs and cats experiencing seizures that are difficult to control with traditional medications. Originally developed for human epilepsy treatment, this medication has shown promise in veterinary medicine as an add-on therapy for refractory epilepsy cases.

Unlike older antiepileptic drugs, lacosamide works through a unique mechanism that targets sodium channels in a novel way, making it particularly valuable for pets that have not responded adequately to first-line seizure medications like phenobarbital or potassium bromide.

How It Works

Lacosamide functions by selectively enhancing the slow inactivation of voltage-gated sodium channels in neurons. This mechanism differs from other antiepileptic drugs, which typically block fast inactivation of these same channels. By prolonging the refractory period of sodium channels, lacosamide reduces neuronal hyperexcitability and prevents the abnormal electrical activity that leads to seizures.

The drug also binds to collapsin response mediator protein-2 (CRMP-2), which may contribute to its antiepileptic effects through modulation of neuronal differentiation and axon outgrowth. This dual mechanism of action makes lacosamide particularly effective for certain types of seizures that may be resistant to other treatments.

Uses & Indications

Primary Uses

• Refractory epilepsy: Treatment of seizures that persist despite adequate trials of first-line antiepileptic drugs
• Add-on therapy: Used in combination with other antiepileptic medications to improve seizure control
• Focal seizures: Particularly effective for partial or focal seizures in dogs and cats
• Cluster seizures: May help reduce the frequency and severity of seizure clusters

Secondary Applications

• Status epilepticus: Emergency treatment when other medications are ineffective
• Transitional therapy: Bridging medication when switching between other antiepileptic drugs
• Neuropathic pain: Off-label use for certain types of chronic pain conditions

Dosage Guidelines

Dogs

• Small dogs (under 25 lbs): 1-2 mg/kg twice daily, gradually increased to 3-4 mg/kg twice daily
• Medium dogs (25-60 lbs): 1-2 mg/kg twice daily, gradually increased to 3-4 mg/kg twice daily
• Large dogs (over 60 lbs): 1-2 mg/kg twice daily, gradually increased to 3-4 mg/kg twice daily

Cats

• Standard dosage: 1-2 mg/kg twice daily, gradually increased to 2-3 mg/kg twice daily

Dosage Adjustments

Lacosamide should always be started at the lowest effective dose and gradually increased over 1-2 weeks to minimize side effects. The maximum recommended dose is typically 6 mg/kg twice daily, though some pets may require higher doses under veterinary supervision.

Administration

Lacosamide is available in oral tablet and liquid formulations. The medication can be given with or without food, though giving it with food may help reduce gastrointestinal side effects in sensitive pets.

Administration Tips

• Divide the daily dose into two equal portions given 12 hours apart
• Maintain consistent timing to ensure stable blood levels
• Do not crush or break tablets unless specifically formulated to be split
• Use the provided measuring device for liquid formulations to ensure accurate dosing

Missed Doses

If a dose is missed, give it as soon as remembered unless it's close to the next scheduled dose. Never double up on doses to make up for a missed one, as this can increase the risk of side effects.

Side Effects

Common Side Effects

• Sedation or drowsiness
• Ataxia (loss of coordination)
• Mild gastrointestinal upset
• Decreased appetite
• Behavioral changes

Rare Side Effects

• Tremors or muscle twitching
• Increased seizure frequency (paradoxical effect)
• Skin reactions or allergic responses
• Changes in liver enzyme levels

Severe Side Effects

• Severe ataxia or inability to walk
• Persistent vomiting or diarrhea
• Signs of liver dysfunction (jaundice, excessive thirst)
• Cardiac arrhythmias
• Severe behavioral changes or aggression

Most side effects are dose-dependent and may resolve with dosage adjustment. However, any concerning symptoms should be evaluated by a veterinarian promptly.

Precautions & Warnings

General Precautions

• Regular monitoring of liver function is recommended during long-term use
• Cardiac monitoring may be necessary in pets with pre-existing heart conditions
• Gradual dose reduction is required when discontinuing to prevent withdrawal seizures
• Use with caution in geriatric pets or those with kidney disease

Special Populations

• Pregnant/nursing animals: Limited safety data available; use only when benefits outweigh risks
• Young animals: Safety and efficacy not fully established in very young pets
• Liver disease: Dose reduction may be necessary in pets with hepatic impairment

Drug Interactions

Major Interactions

• Other antiepileptic drugs: May require dose adjustments when used in combination
• Cardiac medications: Potential for additive effects on heart rhythm
• CNS depressants: Increased sedation when combined with other sedating medications

Monitoring Requirements

Regular blood work should be performed to monitor for drug interactions and ensure therapeutic levels are maintained. This is particularly important when lacosamide is used with other antiepileptic drugs.

Storage

Store lacosamide tablets and oral solution at room temperature (68-77°F) in a dry place away from light and moisture. Keep the medication in its original container with the lid tightly closed. Do not store in bathrooms or other humid areas.

Liquid formulations should not be frozen and should be discarded if they change color or develop an unusual odor. Keep all medications out of reach of children and pets.

FAQ

How long does it take for lacosamide to work?

Lacosamide typically begins to show effects within 1-2 weeks of starting treatment, though optimal seizure control may take 4-6 weeks to achieve as the dose is gradually increased to therapeutic levels.

Can lacosamide be used alone for seizure control?

While lacosamide can be used as monotherapy in some cases, it is most commonly used as add-on therapy with other antiepileptic drugs for pets with refractory epilepsy.

What should I do if my pet has a seizure while on lacosamide?

Continue giving the medication as prescribed and contact your veterinarian. A single breakthrough seizure doesn't necessarily mean the medication isn't working, as complete seizure elimination isn't always possible.

Are there any dietary restrictions while using lacosamide?

No specific dietary restrictions are required, though maintaining a consistent feeding schedule can help with medication absorption and reduce gastrointestinal side effects.

How often will my pet need blood work while on lacosamide?

Initial blood work is typically recommended after 2-4 weeks of treatment, then every 3-6 months during long-term therapy to monitor liver function and ensure the medication is well-tolerated.