Levetiracetam

Common Uses

Levetiracetam is primarily used to reduce the frequency of seizures. It is often prescribed as an add-on treatment to be used alongside other seizure medications, though it may be used alone in certain situations. It works by helping to stabilize electrical activity in the brain to prevent seizures from occurring.

Specific Conditions Treated

• Partial onset seizures: These seizures begin in one specific area of the brain. Levetiracetam is used for adults and children, including infants as young as 1 month old, depending on the specific form of the medication.
• Myoclonic seizures: This medication is used to treat brief, involuntary muscle jerks in adults and children 12 years of age and older who have juvenile myoclonic epilepsy.
• Primary generalized tonic-clonic seizures: These seizures involve the entire brain and cause loss of consciousness and muscle contractions. It is used for adults and children 6 years of age and older with idiopathic generalized epilepsy.

Levetiracetam is available in several forms, including immediate-release tablets, extended-release tablets, oral solutions, and an injection administered by healthcare professionals. It is important to note that while this medication helps control seizures, it does not cure epilepsy and must be taken regularly to remain effective.

Mechanism of Action

Levetiracetam belongs to a class of drugs known as anticonvulsants or antiepileptics. Its primary function is to decrease abnormal electrical activity in the brain to help prevent and control seizures.

The exact way levetiracetam works is not fully understood, but it is known to work differently than many other seizure medications. Researchers believe its effectiveness is linked to the following processes:

• Protein Binding: Levetiracetam binds to a specific protein in the brain called synaptic vesicle protein 2A (SV2A).
• Neurotransmitter Regulation: By interacting with this protein, the medication is thought to help regulate the release of chemical messengers, known as neurotransmitters, between nerve cells.
• Electrical Stability: This interaction helps prevent the sudden, excessive electrical discharges that lead to seizure activity.

Because it targets the SV2A protein rather than common pathways like sodium channels, levetiracetam has a unique mechanism of action compared to many other antiepileptic drugs.

Common Side Effects

Many people using levetiracetam experience mild side effects as their body adjusts to the medication. These may include:

• Dizziness or drowsiness
• Weakness or tiredness
• Headache
• Loss of appetite
• Stuffy nose or sore throat
• Irritability or nervousness

Serious Side Effects

Contact a healthcare provider immediately if you experience any of the following serious symptoms:

• Mood and behavior changes: New or worsening depression, anxiety, agitation, aggression, or thoughts of self-harm or suicide.
• Coordination issues: Difficulty walking, loss of balance, or extreme clumsiness.
• Severe skin reactions: Rash, blisters, or peeling skin, which may be accompanied by fever or muscle aches.
• Signs of infection: Fever, chills, or persistent sore throat.
• Allergic reactions: Swelling of the face, lips, tongue, or throat, or difficulty breathing.
• Extreme sleepiness: Feeling very tired or having trouble waking up.

This is not a complete list of side effects. Always consult with a healthcare professional regarding any new or unusual symptoms while taking this medication.

Behavioral and Psychiatric Reactions

Levetiracetam may cause significant behavioral and psychiatric symptoms. These can include irritability, aggression, agitation, anger, anxiety, and depression. In some cases, patients may experience hallucinations or psychotic symptoms.

Suicidal Ideation

Antiepileptic drugs, including levetiracetam, are associated with an increased risk of suicidal thoughts and behavior. Monitoring for new or worsening depression, suicidal thoughts, or any unusual changes in mood is necessary.

Serious Hypersensitivity Reactions

• DRESS: A rare but serious reaction known as Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS) has been reported. This condition can start as a rash but may progress to affect internal organs such as the liver, kidneys, or lungs.
• Severe Skin Reactions: Serious skin conditions, including Stevens-Johnson Syndrome (SJS) and Toxic Epidermal Necrolysis (TEN), have occurred. These require immediate medical evaluation.

Somnolence and Coordination

Drowsiness, fatigue, and coordination problems (such as ataxia or abnormal gait) are common side effects. These effects are most likely to occur during the first month of treatment and may impair the ability to perform tasks requiring alertness.

Withdrawal Seizures

Levetiracetam should be withdrawn gradually. Abruptly stopping the medication can lead to an increase in seizure frequency or status epilepticus.

Hematologic Abnormalities

Minor decreases in red blood cell counts, white blood cell counts, and neutrophils have been observed. These changes are generally not progressive and often resolve without stopping the medication.

Renal Impairment

Because levetiracetam is primarily eliminated by the kidneys, dosage adjustments are required for patients with impaired renal function.

Pregnancy

The effects of levetiracetam on an unborn baby are not completely understood. However, maintaining seizure control is critical during pregnancy, as seizures can pose risks to both the mother and the fetus. If you are pregnant or planning to become pregnant, discuss your treatment plan with your healthcare provider. Do not start or stop taking this medication without medical advice, as stopping suddenly can lead to a recurrence of seizures.

Pregnant individuals taking levetiracetam are often encouraged to enroll in the North American Antiepileptic Drug (NAAED) Pregnancy Registry. This registry collects information about the safety of antiepileptic medications during pregnancy to help healthcare providers and patients make informed decisions.

Breastfeeding

Levetiracetam passes into breast milk. Because of the potential for side effects in a nursing infant, the decision to breastfeed while taking this medication should be made in consultation with a healthcare professional. They will consider the importance of the drug to the mother's health when providing guidance on whether to continue breastfeeding or the medication.

Available Forms

Levetiracetam is produced in various formats to accommodate different patient needs and administration methods:

• Immediate-release oral tablets
• Extended-release oral tablets
• Oral solution (liquid)
• Tablets for oral suspension (disintegrating tablets that are typically dissolved in liquid before use)
• Intravenous injection (a solution for infusion administered by a healthcare professional)

FDA Approval and Indications

Levetiracetam was first approved by the U.S. Food and Drug Administration (FDA) in 1999. It is indicated for use as adjunctive therapy in the treatment of:

• Partial-onset seizures in patients 1 month of age and older.
• Myoclonic seizures in patients 12 years of age and older with juvenile myoclonic epilepsy.
• Primary generalized tonic-clonic seizures in patients 6 years of age and older with idiopathic generalized epilepsy.

The medication is available in several formulations, including immediate-release tablets, extended-release tablets, oral solutions, and intravenous injections.

Safety Communications and Warnings

In 2023, the FDA issued a safety warning regarding a rare but serious immune system reaction called Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS). This condition can start as a rash but may progress to affect internal organs and can be life-threatening. Healthcare providers are advised to monitor patients for symptoms such as fever, swollen lymph nodes, or inflammation of organs like the liver, kidneys, or lungs.

Like other antiepileptic drugs, levetiracetam is required by the FDA to carry a warning regarding the increased risk of suicidal thoughts or behavior. Patients and caregivers are advised to monitor for any unusual changes in mood or behavior.

Regulatory Classification

Levetiracetam is not classified as a controlled substance under the Controlled Substances Act. It does not currently require a Risk Evaluation and Mitigation Strategy (REMS) program. It is available only by prescription and is produced by multiple manufacturers in both brand-name and generic versions.

Risks of Abrupt Discontinuation

Stopping levetiracetam suddenly can cause serious health complications. If the medication is discontinued abruptly, seizures may return, occur more frequently, or become more severe. In some instances, sudden withdrawal can trigger status epilepticus, a medical emergency where seizures last for a long time or occur close together without recovery in between.

Gradual Dose Reduction

To safely stop treatment, healthcare providers usually recommend a gradual reduction of the dose over time. This tapering process is designed to minimize the risk of withdrawal-related seizures. Your doctor will determine the appropriate schedule for decreasing your dose based on your specific medical needs and how long you have been taking the medication.

Patient Guidance

• Always consult your healthcare provider before making any changes to how you take this medication, even if you feel well.
• Maintain a consistent supply of levetiracetam to prevent accidental withdrawal due to missed doses or running out of your prescription.
• Report any changes in seizure frequency, intensity, or mood to your doctor immediately during the tapering process.