ADHD and Epilepsy

Attention-deficit/hyperactivity disorder (ADHD) and epilepsy occur together more often than would be expected by chance. ADHD can affect children and adults with epilepsy, and symptoms may persist even when seizures are well controlled.

The relationship is bidirectional

People with epilepsy are more likely to have ADHD, and people with ADHD have a higher prevalence of epilepsy than the general population.

This suggests shared biological and developmental factors rather than ADHD simply being a reaction to living with seizures.

How common is ADHD in epilepsy?

A large systematic review and meta-analysis including more than one million participants estimated pooled ADHD prevalence in people with epilepsy at about 22%, although estimates varied substantially between studies, age groups and diagnostic methods.

ADHD is not just hyperactivity

ADHD can present predominantly with inattention, predominantly hyperactive/impulsive symptoms or a combination.

In epilepsy, inattentive symptoms may be particularly easy to overlook.

Why diagnosis can be difficult

Brief absence or focal impaired-awareness seizures can look like inattention.

Sleep deprivation, frequent interictal discharges, medication adverse effects, depression, anxiety and cognitive impairment can also reduce attention.

Staring is not automatically ADHD—or epilepsy

A careful history should distinguish persistent attention difficulties across settings from sudden, stereotyped episodes of impaired awareness.

EEG is used when the clinical history raises a genuine seizure question; it is not a routine diagnostic test for ADHD itself.

Shared causes

Epilepsy and ADHD may share genetic susceptibility, neurodevelopmental pathways and network dysfunction.

ADHD is also common in several genetic and developmental epilepsy syndromes.

Antiseizure medicines can affect attention

Some antiseizure medicines can worsen concentration, processing speed or behaviour in susceptible individuals.

Others may have little cognitive effect. Medication review should therefore form part of the assessment when attention deteriorates.

Can ADHD medication trigger seizures?

The traditional fear that all stimulant treatment substantially lowers seizure threshold is not supported by the current overall evidence.

Recent reviews support appropriately monitored ADHD treatment in people with epilepsy, including stimulant therapy when clinically indicated.

Methylphenidate

Methylphenidate has the largest evidence base among stimulant treatments in epilepsy.

Available evidence suggests it is effective for ADHD symptoms and does not generally produce a major increase in seizure risk when used appropriately, although individual monitoring remains important.

Other ADHD medicines

Atomoxetine and other non-stimulant treatments may be considered depending on age, comorbidity, previous response, cardiovascular factors and local licensing.

Evidence specifically in epilepsy is less extensive than for methylphenidate.

Drug interactions

Potential interactions between ADHD treatment and antiseizure medicines should be checked individually.

Changes in sleep, appetite, mood or adherence can also indirectly affect seizure control.

Adults

ADHD is increasingly recognised in adults with epilepsy rather than being considered purely a childhood disorder.

A 2024 clinical guide for neurologists emphasised that untreated ADHD can significantly affect education, work, relationships, medication adherence and quality of life.

Children and school

Attention problems can affect learning even when intelligence is normal and seizures appear controlled.

Assessment should include school information and consideration of specific learning difficulties.

The central point

ADHD in epilepsy is a genuine comorbidity, not simply “poor concentration because of seizures”. It deserves proper diagnosis and treatment, while seizure type, sleep, medicines and other causes of inattention are assessed at the same time.

Sources

Medical note: ADHD treatment should be individualised with the treating clinician; prescribed medicines should not be stopped or changed without medical advice.

Evidence checked: September 2026.