Seizures in people living with HIV require careful investigation because the cause may be HIV itself, an opportunistic CNS infection, tumour, stroke, metabolic disturbance or medication-related toxicity.
Modern HIV treatment changed the neurological picture
Effective antiretroviral therapy has greatly reduced many severe opportunistic infections where treatment is accessible and viral suppression is maintained.
Neurological complications remain important, particularly with advanced immunosuppression, delayed diagnosis or unstable access to treatment.
Opportunistic infections
Important CNS causes of seizures in advanced HIV can include toxoplasmosis, cryptococcal meningitis, progressive multifocal leukoencephalopathy, tuberculosis and other infections depending on geography and immune status.
Neurocysticercosis
Neurocysticercosis can coexist with HIV in endemic settings.
Clinical behaviour depends on immune status, lesion burden and antiparasitic or antiretroviral treatment.
CNS lymphoma and other structural disease
Primary CNS lymphoma and other mass lesions can produce focal seizures, neurological deficits or altered cognition.
Imaging is therefore often central to evaluation.
Acute seizures versus epilepsy
A seizure during an acute opportunistic infection may be acute symptomatic.
Epilepsy is diagnosed when an enduring epileptogenic brain lesion or recurrent unprovoked seizures remain after the acute cause is controlled.
Medication interactions
People may need both antiretroviral therapy and antiseizure medicines.
Older enzyme-inducing antiseizure drugs can alter concentrations of some antiretroviral medicines, and interactions can work in both directions.
Choosing antiseizure medicines
Modern practice often favours drugs with fewer hepatic enzyme interactions when clinically suitable.
Choice still depends on seizure type, kidney and liver function, psychiatric comorbidity, pregnancy considerations and local availability.
Adherence matters twice
Interrupting antiretroviral therapy may permit immune deterioration and opportunistic disease, while interrupting antiseizure medication can trigger breakthrough seizures.
Stable access to both treatment streams is essential.
Immune reconstitution
When antiretroviral therapy restores immune function, inflammatory responses to existing infections can occasionally worsen neurological symptoms through immune reconstitution inflammatory syndrome.
EEG
EEG is useful when non-convulsive seizures, status epilepticus or recurrent unexplained episodes are suspected.
Imaging and CSF
MRI, CT and cerebrospinal-fluid testing are selected according to immune status, focal signs, suspected pathogen and urgency.
The central point
Epilepsy in HIV is not one disease entity. Seizures can arise from several infectious, structural, metabolic and treatment-related mechanisms, so identifying the underlying cause is essential.
Related reading
Infectious Epilepsies →
Neurocysticercosis and Epilepsy →
Tuberculosis of the CNS and Epilepsy →
Sources
- Seizures and epilepsy in HIV infection — review
- Neurological complications of HIV and opportunistic co-infections — review
- CROI 2025: neurological and neuropsychiatric complications in HIV
Evidence checked: September 2026.