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Banzel Side Effects

Generic name: rufinamide

Medically reviewed by Philip Thornton, DipPharm. Last updated on Nov 2, 2021.

Note: This document contains side effect information about rufinamide. Some of the dosage forms listed on this page may not apply to the brand name Banzel.


Common side effects of Banzel include: seizure, dizziness, drowsiness, fatigue, headache, nausea, and vomiting. Other side effects include: status epilepticus, ataxia, blurred vision, diplopia, and skin rash. See below for a comprehensive list of adverse effects.

For the Consumer

Applies to rufinamide: oral suspension, oral tablets

Side effects include:

Adjunctive therapy in pediatric patients: Somnolence, headache, fatigue, dizziness, influenza, nasopharyngitis, nausea, vomiting, decreased appetite, constipation, stomach pain, decreased weight, cough, sinusitis, bronchitis, pneumonia, otitis media, rash, pruritus, ataxia, diplopia, aggression, hyperactivity, disturbance in attention.

Adjunctive therapy in adults: Headache, dizziness, fatigue, somnolence, diplopia, tremor, nystagmus, blurred vision, nausea, vomiting, stomach pain, constipation, dyspepsia, ataxia, anxiety, back pain, gait disturbance, vertigo.

For Healthcare Professionals

Applies to rufinamide: oral suspension, oral tablet

Nervous system

Very common (10% or more): Somnolence, headache, dizziness

Common (1% to 10%): Status epilepticus, convulsion, abnormal coordination, nystagmus, psychomotor hyperactivity, tremor[Ref]


The most commonly reported adverse reactions overall were headache, dizziness, fatigue, and somnolence.[Ref]


Very common (10% or more): Nausea, vomiting

Common (1% to 10%): Upper abdominal pain, constipation, dyspepsia, diarrhea[Ref]


Common (1% to 10%): Diplopia, blurred vision, nystagmus[Ref]


Common (1% to 10%): Anxiety, insomnia

Frequency not reported: Suicidal behavior and ideation[Ref]


Common (1% to 10%): Back pain[Ref]


Very common (10% or more): Anemia

Uncommon (0.1% to 1%): Lymphadenopathy, leukopenia, neutropenia, iron deficiency anemia, thrombocytopenia[Ref]


Common (1% to 10%): Anorexia, eating disorder, decreased appetite, weight loss[Ref]


Uncommon (0.1% to 1%): Right bundle branch block, first degree atrioventricular block

Frequency not reported: QT shortening[Ref]


Common (1% to 10%): Rash, acne

Postmarketing reports: Stevens-Johnson syndrome and other serious skin rashes with mucosal involvement[Ref]


Common (1% to 10%): Oligomenorrhea[Ref]


Uncommon (0.1% to 1%): Hepatic enzymes increased[Ref]


Frequency not reported: Multi-organ sensitivity reactions (DRESS)

Postmarketing reports: DRESS[Ref]


Common (1% to 10%): Pneumonia, influenza, nasopharyngitis, ear infection sinusitis, rhinitis[Ref]


Very common (10% or more): Fatigue

Common (1% to 10%): Gait disturbance

Frequency not reported: Head injury, contusion[Ref]


Common (1% to 10%): Epistaxis[Ref]


1. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0

2. "Product Information. Banzel (rufinamide)." Eisai Inc (2008):

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.