Epilepsy Drug Pipeline: 43 Assets by Phase

How many epilepsy drugs are in each phase of development?

Douglas Insights counts 16 epilepsy candidates in Phase III, 37% of the 43 assets in development; Phase II holds 12 and Phase I holds 15.

Phase I/II candidates sit in the Phase I row and Phase II/III candidates in the Phase II row, so each epilepsy asset appears in exactly one row. The 173 trials still recruiting or running carry 33% of the 518 registered trials in scope.

Which approved epilepsy medicines are still in trials?

8 medicines already on the market are still being tested in epilepsy Phase IV trials; Levetiracetam has the most, with 44 registered trials.

Post-approval epilepsy trials test new doses, new patient groups and head-to-head comparisons. They set the standard of care that every candidate in development will be measured against, so the paid review profiles each one.

How many epilepsy trials are recruiting patients now?

98 epilepsy trials are recruiting patients and 31 more have not started recruiting yet, out of 518 interventional trials in scope; together they make up 25% of the trial base.

Terminated, suspended and withdrawn epilepsy trials stay in the trial base so that a stalled programme is visible, but a candidate whose only trials stopped is no longer counted as in development.

Which companies lead the epilepsy pipeline?

Praxis Precision Medicines leads the epilepsy pipeline with 5 candidates; the top 5 sponsors hold 30% of the 43 assets, and 35 sponsors run at least one.

Industry sponsors lead 264 of the 518 epilepsy trials (51%); universities, hospitals and public funders lead the rest. A sponsor is credited with an asset when it is the lead sponsor on most of that asset's industry trials.

Which drug types and mechanisms dominate the epilepsy pipeline?

Mechanism and drug-type classification for the 43 epilepsy candidates is done by the research desk asset by asset, each with a cited source, and is published in the paid review together with the white-space map.

What epilepsy trial readouts are coming next?

17 epilepsy candidates in Phase II or later have a registered primary completion date in the next 12 months; the next three are below, each linked to its registry record.

Primary completion is the date a sponsor expects the last patient to finish the main measurement, so data usually follow within months. Dates marked estimated are the sponsor's own forecast on the registry and often move.

How many epilepsy readouts fall in each quarter?

18 epilepsy candidates in Phase II or later reach registered primary completion over the next eight quarters, with the most, 8, due in Q4 2026.

Each candidate is counted once, at its next readout. The paid catalyst calendar names every readout with its trial, sponsor and design, adds filings and regulatory decisions, and runs 24 months ahead.

Which countries host the most epilepsy trials?

United States hosts the most epilepsy trials, with sites in 287 of the 518 studies (55%); trials in scope run in 75 countries in all.

A multinational epilepsy trial is counted once in every country where it has a site, so the shares add up to more than 100%. Country spread shows where sponsors are building the evidence that regulators in each market will ask for.

Where are epilepsy drugs being tested?

287 of the 518 epilepsy trials (55%) have a site in the United States, 176 (34%) in Europe and 50 (9.7%) in China; 34 of the 43 candidates in development are tested in the US.

Each region's trials are the evidence its regulator will review: the FDA in the United States, the EMA (with the MHRA and Swissmedic) in Europe, the NMPA in China and the PMDA in Japan. A multinational epilepsy trial counts once in every region where it has a site, so the shares add up to more than 100%. A candidate tested only outside the US and Europe is often a licensing opportunity for sponsors in those markets.

What has changed in the epilepsy pipeline since the last update?

Since 3 Oct 2026, the epilepsy pipeline count moved by −2 assets to 43, Phase III moved by 0 and the trial base by 0.

How does Douglas Insights count the epilepsy pipeline?

Douglas Insights read 518 interventional trials registered on ClinicalTrials.gov for the conditions "epilepsy", "seizures" and updated since 3 Oct 2021, then grouped every drug or biologic named in them into 43 unique candidates.

1. Code names, generic names and brand names of the same molecule are merged into one candidate, and every merge is reviewed by the research desk.
2. A candidate counts when it has a trial that is recruiting, running, or completed in the last 24 months, and at least one industry-sponsored trial.
3. Its phase is the highest phase among those trials; placebo, standard-of-care and comparator arms are not candidates.
4. Each figure on this page is drawn from one frozen dataset that passes ten checks before release, and the owner approves every edition.

Read the full approach on the research methodology page, or browse other Pharmaceuticals research.

Frequently asked questions about the epilepsy pipeline

Research & citation

This review was researched, written and reviewed by the Douglas Insights Research Desk under the Douglas Insights editorial standards. Material errors are logged in the corrections log. No section is sponsored.

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