The short answer
Ginkgo deserves particular review if you take amantadine and have a seizure history. Both sources raise seizure-related precautions, but no direct study established the risk of this exact combination.
What this answer covers
Ginkgo biloba leaf preparations; not equivalent to raw seed ingestion or every extract.
- Supplement or preparation
- Ginkgo biloba
- Medication ingredient
- amantadine
Seizure history changes the concern
Amantadine labeling advises close observation for increased seizure activity in people with epilepsy or prior seizures. The ginkgo leaf monograph says further seizures cannot be excluded in people with epilepsy.
The original cases did not test amantadine
Two patients with previously controlled epilepsy had seizures after starting ginkgo extract and no reported recurrence during follow-up after stopping it. Those cases raise concern but do not prove an amantadine interaction or quantify its risk.
Do not transfer seed toxicity to every leaf product
Leaf extracts and seeds differ. The precaution here relies on the leaf monograph and extract cases, rather than treating raw-seed poisoning as proof about every supplement. No exact safe dose or interaction mechanism was established.
Review the product and seizure history
Tell the prescriber about ginkgo, previous seizures and other medicines before co-use. Do not adjust amantadine yourself or assume a timing gap removes the concern. A new seizure requires urgent medical assessment.
Evidence and practical considerations
Side effects & toxicity
Conditional seizure-history precaution supported by exact amantadine labeling, ginkgo leaf monograph and indirect extract cases. No exact-pair clinical proof, general toxicity rate or all-preparation equivalence.
- Exact scope
- Ginkgo biloba leaf preparations; not equivalent to raw seed ingestion or every extract. with Oral amantadine hydrochloride immediate-release capsules; GOCOVRI extended-release considered separately.
- Medication form and route
- oral medication; oral supplement
What remains uncertain
- No unmeasured pair incidence, blanket class transfer or arbitrary spacing interval.
Factors that may matter: Preparation; Dose; Other medicines; Organ function.
Read the supporting source summaries
Source 1: current product label
dailymed.nlm.nih.gov · Source check Sep 10, 2026
Population: People prescribed amantadine
May cause insomnia, agitation or somnolence; careful observation with CNS stimulants and other CNS-active medicines. Renal elimination and seizure-history precautions.
How this applies: Exact amantadine RxCUI 620 IN, with stated salt/formulation/route bridge.
No exact supplement-combination incidence or validated protective spacing; salt, route and release form limits apply.
Source 2: Regulatory herbal monograph
ema.europa.eu · Source check Sep 10, 2026
Population: People considering covered ginkgo leaf preparations.
States that further seizures promoted by ginkgo preparations cannot be excluded in people with epilepsy.
How this applies: Interpreted for amantadine only within the stated exact preparation and endpoint limits.
Regulatory precaution for covered leaf preparations in people with epilepsy; no exact amantadine combination risk or equivalence with seeds.
Source 3: Original human study
pubmed.ncbi.nlm.nih.gov · Source check Sep 10, 2026
Population: Two people with previously controlled epilepsy.
Seizures recurred after initiation and did not recur during reported follow-up after discontinuation.
How this applies: Interpreted for amantadine only within the stated exact preparation and endpoint limits.
Two epilepsy case reports after ginkgo extract; no amantadine co-use identified, no controlled causality or event rate.
Research assessment: · Open full citations ↗
Review and change history
- Publication status
- Published research summary
- Clinical review
- Not yet recorded
| Date | Update |
|---|---|
| Research summary published | |
| Article prepared | |
| Prepared exact amantadine article with formulation-specific evidence and uncertainty. |
Article revision: 62863b17a8bf82b8
This guide brings together the evidence records used by our interaction checker. Each finding retains its own preparation limits, research date, and source summaries.
Full citations require verification. Reading this answer and the source summaries does not.
Taking other supplements or medications?
Use the checker to explore your other combinations. Ask a pharmacist to review the exact products, amounts and medical conditions in your complete list.
Open the interaction checkerInformation, not medical advice. Do not change prescribed treatment based on this guide.